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• SQLite delete the last 25% of records in a database.

  - by Steven smethurst

  I am using a SQLite database to store values from a data logger. The data logger will eventually fills up all the available hard drive space on the computer. I'm looking for a way to remove the last 25% of the logs from the database once it reaches a certain limit. Using the following code: $ret = Query( 'SELECT id as last FROM data ORDER BY id desc LIMIT 1 ;' ); $last_id = $ret[0]['last'] ; $ret = Query( 'SELECT count( * ) as total FROM data' ); $start_id = $last_id - $ret[0]['total'] * 0.75 ; Query( 'DELETE FROM data WHERE id < '. round( $start_id, 0 ) ); A journal file gets created next to the database that fills up the remaining space on the drive until the script fails. How/Can I stop this journal file from being created? Anyway to combined all three SQL queries in to one statement?

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• ?11.2RAC??????????????

  - by JaneZhang(???)

         ?????,???????????????,???dbca???????,???????????dbca,?????????11.2???????,???????,??dbca??????????????????,????????????????     ????11.2???????RACDB2???,?????RACDB1? ?????rac1,????rac2?     ?11.2?,?????grid?????GI,??oracle????????,????????oracle?????? 1. ??????????????????,?????,???????????:audit_file_dest, background_dump_dest, user_dump_dest ?core_dump_dest????audit_file_dest=/u01/app/oracle/admin/RACDB/adump,?????????,?????????:ORA-09925: Unable to create audit trail fileLinux-x86_64 Error: 2: No such file or directoryAdditional information: 99252. ????????????????????????????:SQL> alter system set instance_number=2 scope=spfile sid='RACDB2';SQL> alter system set thread=2 scope=spfile sid='RACDB2';SQL> alter system set undo_tablespace='UNDOTBS2' scope=spfile sid='RACDB2';SQL> alter system set local_listener='(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=192.0.2.122)(PORT=1521))))' sid='RACDB2'; <=====192.0.2.122???2?VIP 3. ???????DB?$ORACLE_HOME/dbs/init<sid>.ora ?????DB?$ORACLE_HOME/dbs/init<sid>.ora,??????????????init<sid>.ora ????,????spfile???:=======================SPFILE='+DATA/racdb/spfileracdb.ora'??:[oracle@rac1 ~]$ scp $ORACLE_HOME/dbs/initRACDB1.ora rac2:$ORACLE_HOME/dbs/initRACDB2.ora <===????????24.  ??????/etc/oratab,????????????:RACDB2:/u01/app/oracle/product/11.2.0/dbhome_1:N       5.  ???????????: DB?$ORACLE_HOME/dbs/ora<sid>.pwd ????DB?$ORACLE_HOME/dbs/ora<sid>.pwd,??????????????:[oracle@rac1 dbs]$ scp $ORACLE_HOME/dbs/orapwRACDB1 rac2:$ORACLE_HOME/dbs/orapwRACDB2 <==?????26.  ?????????????,????????UNDO TABLESPACE?(??????dbca?????,???????undo tablespace????,?????????)??:SQL>CREATE UNDO TABLESPACE "UNDOTBS2" DATAFILE '/dev/….' SIZE 4096M ;???????:SQL>CREATE UNDO TABLESPACE "UNDOTBS2" DATAFILE '+DATA' SIZE 4096M ;7.  ?????????????,????????redo thread?redo log:??:SQL> alter database add logfile thread 2      group 3 ('/dev/...', '/dev/...') size 1024M,     group 4 ('/dev/...','dev/...') size 1024M;???????:SQL> alter database add logfile thread 2     group 3 ('+DATA','+RECO') size 1024M,     group 4 ('+DATA','+RECO') size 1024M;SQL> alter database enable thread 2; <==????thread8.  ??????????,?????????????:[oracle@rac2 admin]$su - oracle[oracle@rac2 admin]$export ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1[oracle@rac2 admin]$export ORACLE_SID=RACDB2[oracle@rac2 admin]$ sqlplus / as sysdbaSQL> startup <==??????,???????2????????????9. ?????OCR???GI??,?????????????:$srvctl add instance -d <database name> -i <new instance name> -n <new node name>Example of srvctl add instance command:============================[oracle@rac2 ~]$ srvctl add instance -d racdb -i RACDB2 -n rac2  <==????????,????ps -ef|grep smon???[oracle@rac2 dbs]$ ps -ef|grep smonroot      3453     1  1 Jun12 ?        04:03:05 /u01/app/11.2.0/grid/bin/osysmond.bingrid      3727     1  0 Jun12 ?        00:00:19 asm_smon_+ASM2oracle    5343  4543  0 14:06 pts/1    00:00:00 grep smonoracle   28736     1  0 Jun25 ?        00:00:03 ora_smon_RACDB2 <========??????10. ???????:$su - grid[grid@rac2 ~]$ crsctl stat res -t...ora.racdb.db      1        ONLINE  ONLINE       rac1                     Open                      2        OFFLINE OFFLINE             rac2????,??????offline,????????????sqlplus??????sqlplus??????,???srvctl??:[grid@rac2 ~]$ su  - oraclePassword: [oracle@rac2 ~]$ sqlplus / as sysdbaSQL> shutdown immediate;Database closed.Database dismounted.ORACLE instance shut down.SQL> exit[oracle@rac2 ~]$ srvctl start instance -d racdb -i RACDB2[oracle@rac2 ~]$ su - gridPassword: [grid@rac2 ~]$ crsctl stat res -tora.racdb.db      1        ONLINE  ONLINE       rac1                     Open                      2        ONLINE  ONLINE       rac2                     Open                11. ?????????:[oracle@rac2 ~]$ crsctl stat res ora.racdb.db -pNAME=ora.racdb.dbTYPE=ora.database.typeACL=owner:oracle:rwx,pgrp:oinstall:rwx,other::r--ACTION_FAILURE_TEMPLATE=ACTION_SCRIPT=ACTIVE_PLACEMENT=1AGENT_FILENAME=%CRS_HOME%/bin/oraagent%CRS_EXE_SUFFIX%AUTO_START=restoreCARDINALITY=2CHECK_INTERVAL=1CHECK_TIMEOUT=30CLUSTER_DATABASE=trueDATABASE_TYPE=RACDB_UNIQUE_NAME=RACDBDEFAULT_TEMPLATE=PROPERTY(RESOURCE_CLASS=database) PROPERTY(DB_UNIQUE_NAME= CONCAT(PARSE(%NAME%, ., 2), %USR_ORA_DOMAIN%, .)) ELEMENT(INSTANCE_NAME= %GEN_USR_ORA_INST_NAME%) ELEMENT(DATABASE_TYPE= %DATABASE_TYPE%)DEGREE=1DESCRIPTION=Oracle Database resourceENABLED=1FAILOVER_DELAY=0FAILURE_INTERVAL=60FAILURE_THRESHOLD=1GEN_AUDIT_FILE_DEST=/u01/app/oracle/admin/RACDB/adumpGEN_START_OPTIONS=GEN_START_OPTIONS@SERVERNAME(rac1)=openGEN_START_OPTIONS@SERVERNAME(rac2)=openGEN_USR_ORA_INST_NAME=GEN_USR_ORA_INST_NAME@SERVERNAME(rac1)=RACDB1HOSTING_MEMBERS=INSTANCE_FAILOVER=0LOAD=1LOGGING_LEVEL=1MANAGEMENT_POLICY=AUTOMATICNLS_LANG=NOT_RESTARTING_TEMPLATE=OFFLINE_CHECK_INTERVAL=0ONLINE_RELOCATION_TIMEOUT=0ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1ORACLE_HOME_OLD=PLACEMENT=restrictedPROFILE_CHANGE_TEMPLATE=RESTART_ATTEMPTS=2ROLE=PRIMARYSCRIPT_TIMEOUT=60SERVER_POOLS=ora.RACDBSPFILE=+DATA/RACDB/spfileRACDB.oraSTART_DEPENDENCIES=hard(ora.DATA.dg,ora.RECO.dg) weak(type:ora.listener.type,global:type:ora.scan_listener.type,uniform:ora.ons,global:ora.gns) pullup(ora.DATA.dg,ora.RECO.dg)START_TIMEOUT=600STATE_CHANGE_TEMPLATE=STOP_DEPENDENCIES=hard(intermediate:ora.asm,shutdown:ora.DATA.dg,shutdown:ora.RECO.dg)STOP_TIMEOUT=600TYPE_VERSION=3.2UPTIME_THRESHOLD=1hUSR_ORA_DB_NAME=RACDBUSR_ORA_DOMAIN=USR_ORA_ENV=USR_ORA_FLAGS=USR_ORA_INST_NAME=USR_ORA_INST_NAME@SERVERNAME(rac1)=RACDB1USR_ORA_INST_NAME@SERVERNAME(rac2)=RACDB2USR_ORA_OPEN_MODE=openUSR_ORA_OPI=falseUSR_ORA_STOP_MODE=immediateVERSION=11.2.0.3.0???11.2,?OCR???database??,??????,???????????database???????database???????,??????,???????????????ASM????????????  ?:dbca ???????????:????????oracle????dbca:su - oracledbca?? RAC database?? Instance Management?? add an instance???active rac database??????? ??undo?redo??

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• ant ftp doesn't download files in subdirectories

  - by Kristof Neirynck

  Hello, I'm trying to download files in subdirectories from an ftp server with ant. The exact set of files is known. Some of them are in subdirectories. Ant only seems to download the ones in the root directory. It does work if I download all files without listing them. The first ftp action should do the exact same thing as the second. Instead it complains about "Hidden files" and seems to prefix the paths with "\\". Does anyone know what's wrong here? Is this a bug in commons-net? build.xml <?xml version="1.0" encoding="utf-8"?> <project name="example" default="example" basedir="."> <taskdef name="ftp" classname="org.apache.tools.ant.taskdefs.optional.net.FTP" /> <target name="example"> <!-- 2 files retrieved --> <ftp action="get" verbose="true" server="localhost" userid="example" password="example"> <fileset dir="downloads" casesensitive="false" includes="root1.txt,root2.txt,a/a.txt,a/b/ab.txt,c/c.txt" /> </ftp> <!-- 5 files retrieved --> <ftp action="get" verbose="true" server="localhost" userid="example" password="example"> <fileset dir="downloads" casesensitive="false" includes="**/*" /> </ftp> </target> </project> run_ant.bat @ECHO OFF PUSHD %~dp0 SET CLASSPATH= SET ANT_HOME=C:\apache-ant-1.8.0 SET ant=%ANT_HOME%\bin\ant.bat SET antoptions=-nouserlib -noclasspath -d SET ftpjars=^ -lib lib\jakarta-oro-2.0.8.jar ^ -lib lib\commons-net-2.0.jar CALL %ant% %antoptions% %ftpjars% > output.txt POPD output.txt Unable to locate tools.jar. Expected to find it in C:\PROGRA~1\Java\jre6\lib\tools.jar Apache Ant version 1.8.0 compiled on February 1 2010 Trying the default build file: build.xml Buildfile: G:\ftp\build.xml Adding reference: ant.PropertyHelper Detected Java version: 1.6 in: C:\PROGRA~1\Java\jre6 Detected OS: Windows 7 Adding reference: ant.ComponentHelper Setting ro project property: ant.file -> G:\ftp\build.xml Setting ro project property: ant.file.type -> file Adding reference: ant.projectHelper Adding reference: ant.parsing.context Adding reference: ant.targets parsing buildfile G:\ftp\build.xml with URI = file:/G:/ftp/build.xml Setting ro project property: ant.project.name -> example Adding reference: example Setting ro project property: ant.project.default-target -> example Setting ro project property: ant.file.example -> G:\ftp\build.xml Setting ro project property: ant.file.type.example -> file Project base dir set to: G:\ftp +Target: +Target: example Adding reference: ant.LocalProperties parsing buildfile jar:file:/C:/apache-ant-1.8.0/lib/ant.jar!/org/apache/tools/ant/antlib.xml with URI = jar:file:/C:/apache-ant-1.8.0/lib/ant.jar!/org/apache/tools/ant/antlib.xml from a zip file Class org.apache.tools.ant.taskdefs.optional.net.FTP loaded from parent loader (parentFirst) Setting ro project property: ant.project.invoked-targets -> example Attempting to create object of type org.apache.tools.ant.helper.DefaultExecutor Adding reference: ant.executor Build sequence for target(s) `example' is [example] Complete build sequence is [example, ] example: [ftp] Opening FTP connection to localhost [ftp] connected [ftp] logging in to FTP server [ftp] login succeeded [ftp] getting files fileset: Setup scanner in dir G:\ftp\downloads with patternSet{ includes: [root1.txt, root2.txt, a/a.txt, a/b/ab.txt] excludes: [] } will try to cd to A where a directory called a exists testing case sensitivity, attempting to cd to A remote system is case sensitive : false [ftp] Hidden file \\a\b\ assumed to not be a symlink. filelist map used in listing files filelist map used in listing files [ftp] Hidden file \\a\b\ assumed to not be a symlink. filelist map used in listing files filelist map used in listing files filelist map used in listing files filelist map used in listing files filelist map used in listing files [ftp] Hidden file \\a\a.txt assumed to not be a symlink. filelist map used in listing files [ftp] Hidden file \\a\a.txt assumed to not be a symlink. filelist map used in listing files filelist map used in listing files filelist map used in listing files [ftp] transferring root1.txt to G:\ftp\downloads\root1.txt [ftp] File G:\ftp\downloads\root1.txt copied from localhost [ftp] transferring root2.txt to G:\ftp\downloads\root2.txt [ftp] File G:\ftp\downloads\root2.txt copied from localhost [ftp] 2 files retrieved [ftp] disconnecting [ftp] Opening FTP connection to localhost [ftp] connected [ftp] logging in to FTP server [ftp] login succeeded [ftp] getting files fileset: Setup scanner in dir G:\ftp\downloads with patternSet{ includes: [**/*] excludes: [] } will try to cd to A where a directory called a exists testing case sensitivity, attempting to cd to A remote system is case sensitive : false [ftp] transferring a\a.txt to G:\ftp\downloads\a\a.txt [ftp] File G:\ftp\downloads\a\a.txt copied from localhost [ftp] transferring a\b\ab.txt to G:\ftp\downloads\a\b\ab.txt [ftp] File G:\ftp\downloads\a\b\ab.txt copied from localhost [ftp] transferring c\c.txt to G:\ftp\downloads\c\c.txt [ftp] File G:\ftp\downloads\c\c.txt copied from localhost [ftp] transferring root1.txt to G:\ftp\downloads\root1.txt [ftp] File G:\ftp\downloads\root1.txt copied from localhost [ftp] transferring root2.txt to G:\ftp\downloads\root2.txt [ftp] File G:\ftp\downloads\root2.txt copied from localhost [ftp] 5 files retrieved [ftp] disconnecting BUILD SUCCESSFUL Total time: 0 seconds server log (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> Connected, sending welcome message... (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.34 beta (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-written by Tim Kosse ([email protected]) (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/ (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> USER example (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 331 Password required for example (000153) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> PASS ******* (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 230 Logged on (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> TYPE I (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Type set to I (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> SYST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 215 UNIX emulated by FileZilla (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,232 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD A (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/A" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD a (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD b (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //a/b (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,233 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,234 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //\\a\b\ (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //\\a\b\ (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a/b" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD a (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD //a (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/a" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,235 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,236 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> RETR root1.txt (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,237 (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> RETR root2.txt (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> QUIT (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> 221 Goodbye (000153) 7/05/2010 19:46:12 - example (127.0.0.1)> disconnected. (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> Connected, sending welcome message... (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-FileZilla Server version 0.9.34 beta (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220-written by Tim Kosse ([email protected]) (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 220 Please visit http://sourceforge.net/projects/filezilla/ (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> USER example (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> 331 Password required for example (000154) 7/05/2010 19:46:12 - (not logged in) (127.0.0.1)> PASS ******* (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 230 Logged on (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> TYPE I (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Type set to I (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> SYST (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 215 UNIX emulated by FileZilla (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,239 (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD A (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/A" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PWD (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 257 "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> PORT 127,0,0,1,207,240 (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:12 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD a (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,241 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD //a/ (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/a" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD b (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/a/b" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,242 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/a" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD c (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/c" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,243 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> LIST (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for directory list. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CDUP (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 CDUP successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> CWD / (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 250 CWD successful. "/" is current directory. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,244 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR a/a.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,245 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR a/b/ab.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,246 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR c/c.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,247 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR root1.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> PORT 127,0,0,1,207,248 (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 200 Port command successful (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> RETR root2.txt (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 150 Opening data channel for file transfer. (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 226 Transfer OK (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> QUIT (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> 221 Goodbye (000154) 7/05/2010 19:46:13 - example (127.0.0.1)> disconnected.

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• CreationName for SSIS 2008 and adding components programmatically

  If you are building SSIS 2008 packages programmatically and adding data flow components, you will probably need to know the creation name of the component to add. I can never find a handy reference when I need one, hence this rather mundane post. See also CreationName for SSS 2005. We start with a very simple snippet for adding a component: // Add the Data Flow Task package.Executables.Add("STOCK:PipelineTask"); // Get the task host wrapper, and the Data Flow task TaskHost taskHost = package.Executables[0] as TaskHost; MainPipe dataFlowTask = (MainPipe)taskHost.InnerObject; // Add OLE-DB source component - ** This is where we need the creation name ** IDTSComponentMetaData90 componentSource = dataFlowTask.ComponentMetaDataCollection.New(); componentSource.Name = "OLEDBSource"; componentSource.ComponentClassID = "DTSAdapter.OLEDBSource.2"; So as you can see the creation name for a OLE-DB Source is DTSAdapter.OLEDBSource.2. CreationName Reference  ADO NET Destination Microsoft.SqlServer.Dts.Pipeline.ADONETDestination, Microsoft.SqlServer.ADONETDest, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91 ADO NET Source Microsoft.SqlServer.Dts.Pipeline.DataReaderSourceAdapter, Microsoft.SqlServer.ADONETSrc, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91 Aggregate DTSTransform.Aggregate.2 Audit DTSTransform.Lineage.2 Cache Transform DTSTransform.Cache.1 Character Map DTSTransform.CharacterMap.2 Checksum Konesans.Dts.Pipeline.ChecksumTransform.ChecksumTransform, Konesans.Dts.Pipeline.ChecksumTransform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b2ab4a111192992b Conditional Split DTSTransform.ConditionalSplit.2 Copy Column DTSTransform.CopyMap.2 Data Conversion DTSTransform.DataConvert.2 Data Mining Model Training MSMDPP.PXPipelineProcessDM.2 Data Mining Query MSMDPP.PXPipelineDMQuery.2 DataReader Destination Microsoft.SqlServer.Dts.Pipeline.DataReaderDestinationAdapter, Microsoft.SqlServer.DataReaderDest, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91 Derived Column DTSTransform.DerivedColumn.2 Dimension Processing MSMDPP.PXPipelineProcessDimension.2 Excel Destination DTSAdapter.ExcelDestination.2 Excel Source DTSAdapter.ExcelSource.2 Export Column TxFileExtractor.Extractor.2 Flat File Destination DTSAdapter.FlatFileDestination.2 Flat File Source DTSAdapter.FlatFileSource.2 Fuzzy Grouping DTSTransform.GroupDups.2 Fuzzy Lookup DTSTransform.BestMatch.2 Import Column TxFileInserter.Inserter.2 Lookup DTSTransform.Lookup.2 Merge DTSTransform.Merge.2 Merge Join DTSTransform.MergeJoin.2 Multicast DTSTransform.Multicast.2 OLE DB Command DTSTransform.OLEDBCommand.2 OLE DB Destination DTSAdapter.OLEDBDestination.2 OLE DB Source DTSAdapter.OLEDBSource.2 Partition Processing MSMDPP.PXPipelineProcessPartition.2 Percentage Sampling DTSTransform.PctSampling.2 Performance Counters Source DataCollectorTransform.TxPerfCounters.1 Pivot DTSTransform.Pivot.2 Raw File Destination DTSAdapter.RawDestination.2 Raw File Source DTSAdapter.RawSource.2 Recordset Destination DTSAdapter.RecordsetDestination.2 RegexClean Konesans.Dts.Pipeline.RegexClean.RegexClean, Konesans.Dts.Pipeline.RegexClean, Version=2.0.0.0, Culture=neutral, PublicKeyToken=d1abe77e8a21353e Row Count DTSTransform.RowCount.2 Row Count Plus Konesans.Dts.Pipeline.RowCountPlusTransform.RowCountPlusTransform, Konesans.Dts.Pipeline.RowCountPlusTransform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b2ab4a111192992b Row Number Konesans.Dts.Pipeline.RowNumberTransform.RowNumberTransform, Konesans.Dts.Pipeline.RowNumberTransform, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b2ab4a111192992b Row Sampling DTSTransform.RowSampling.2 Script Component Microsoft.SqlServer.Dts.Pipeline.ScriptComponentHost, Microsoft.SqlServer.TxScript, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91 Slowly Changing Dimension DTSTransform.SCD.2 Sort DTSTransform.Sort.2 SQL Server Compact Destination Microsoft.SqlServer.Dts.Pipeline.SqlCEDestinationAdapter, Microsoft.SqlServer.SqlCEDest, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91 SQL Server Destination DTSAdapter.SQLServerDestination.2 Term Extraction DTSTransform.TermExtraction.2 Term Lookup DTSTransform.TermLookup.2 Trash Destination Konesans.Dts.Pipeline.TrashDestination.Trash, Konesans.Dts.Pipeline.TrashDestination, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b8351fe7752642cc TxTopQueries DataCollectorTransform.TxTopQueries.1 Union All DTSTransform.UnionAll.2 Unpivot DTSTransform.UnPivot.2 XML Source Microsoft.SqlServer.Dts.Pipeline.XmlSourceAdapter, Microsoft.SqlServer.XmlSrc, Version=10.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91 Here is a simple console program that can be used to enumerate the pipeline components installed on your machine, and dumps out a list of all components like that above. You will need to add a reference to the Microsoft.SQLServer.ManagedDTS assembly. using System; using System.Diagnostics; using Microsoft.SqlServer.Dts.Runtime; public class Program { static void Main(string[] args) { Application application = new Application(); PipelineComponentInfos componentInfos = application.PipelineComponentInfos; foreach (PipelineComponentInfo componentInfo in componentInfos) { Debug.WriteLine(componentInfo.Name + "\t" + componentInfo.CreationName); } Console.Read(); } }

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• SQL SERVER – History of SQL Server Database Encryption

  - by pinaldave

  I recently met Michael Coles and Rodeney Landrum the author of one of the kind book Expert SQL Server 2008 Encryption at SQLPASS in Seattle. During the conversation we ended up how Microsoft is evolving encryption technology. The same discussion lead to talking about history of encryption tools in SQL Server. Michale pointed me to page 18 of his book of encryption. He explicitly give me permission to re-produce relevant part of history from his book. Encryption in SQL Server 2000 Built-in cryptographic encryption functionality was nonexistent in SQL Server 2000 and prior versions. In order to get server-side encryption in SQL Server you had to resort to purchasing or creating your own SQL Server XPs. Creating your own cryptographic XPs could be a daunting task owing to the fact that XPs had to be compiled as native DLLs (using a language like C or C++) and the XP application programming interface (API) was poorly documented. In addition there were always concerns around creating wellbehaved XPs that “played nicely” with the SQL Server process. Encryption in SQL Server 2005 Prior to the release of SQL Server 2005 there was a flurry of regulatory activity in response to accounting scandals and attacks on repositories of confidential consumer data. Much of this regulation centered onthe need for protecting and controlling access to sensitive financial and consumer information. With the release of SQL Server 2005 Microsoft responded to the increasing demand for built-in encryption byproviding the necessary tools to encrypt data at the column level. This functionality prominently featured the following: Support for column-level encryption of data using symmetric keys or passphrases. Built-in access to a variety of symmetric and asymmetric encryption algorithms, including AES, DES, Triple DES, RC2, RC4, and RSA. Capability to create and manage symmetric keys. Key creation and management. Ability to generate asymmetric keys and self-signed certificates, or to install external asymmetric keys and certificates. Implementation of hierarchical model for encryption key management, similar to the ANSI X9.17 standard model. SQL functions to generate one-way hash codes and digital signatures, including SHA-1 and MD5 hashes. Additional SQL functions to encrypt and decrypt data. Extensions to the SQL language to support creation, use, and administration of encryption keys and certificates. SQL CLR extensions that provide access to .NET-based encryption functionality. Encryption in SQL Server 2008 Encryption demands have increased over the past few years. For instance, there has been a demand for the ability to store encryption keys “off-the-box,” physically separate from the database and the data it contains. Also there is a recognized requirement for legacy databases and applications to take advantage of encryption without changing the existing code base. To address these needs SQL Server 2008 adds the following features to its encryption arsenal: Transparent Data Encryption (TDE): Allows you to encrypt an entire database, including log files and the tempdb database, in such a way that it is transparent to client applications. Extensible Key Management (EKM): Allows you to store and manage your encryption keys on an external device known as a hardware security module (HSM). Cryptographic random number generation functionality. Additional cryptography-related catalog views and dynamic management views. SQL language extensions to support the new encryption functionality. The encryption book covers all the tools in its various chapter in one simple story. If you are interested how encryption evolved and reached to the stage where it is today, this book is must for everyone. You can read my earlier review of the book over here. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority Book Review, SQLAuthority News, T SQL, Technology Tagged: Encryption, SQL Server Encryption, SQLPASS

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• Screen Scraping Twitter

  - by BRADINO

  I got an email today asking for help to scrape Twitter. In particular, to be able to login. So I am going to show everyone, NOT to encourage anyone to violate Twitters terms of use but as an educational blog post about how PHP and cURL can be used to post variables and store cookies. Again, I am using the cScrape class I wrote, which you can download. Step 1 First go to twitter.com and look at the source code of the login to get the form field names and the form post location. You will see that the form posts to https://twitter.com/session and the username and password fields are session[username_or_email] and session[password] respectively. Step 2 Now you are ready to login. So using the fetch function in the Scrape class you create an associative array to contain the form values you want to post. The other thing you will need to do is uncomment the lines for CURLOPT_COOKIEFILE and CURLOPT_COOKIEJAR. Cookies will be required to stay logged in and scrape around. The paths to the cookie files need to be writable by your app. Also you will need to uncomment the line about CURLOPT_FOLLOWLOCATION. $data = array('session[username_or_email]' => "bradino", 'session[password]' => "secret"); $scrape->fetch('https://twitter.com/sessions',$data); Step 1.5 Oops that didn't work. All I got back was 403 Forbidden: The server understood the request, but is refusing to fulfill it. Ahhh I see another variable called authenticity_token I bet Twitter was looking for that. So let's back up and first hit twitter.com to get the authenticity_token variable, and then make the login post request with that variable included in our array of parameters. $scrape->fetch('https://twitter.com'); $data = array('session[username_or_email]' => "bradino", 'session[password]' => "secret"); $data['authenticity_token'] = $scrape->fetchBetween('name="authenticity_token" type="hidden" value="','"',$scrape->result); $scrape->fetch('https://twitter.com/sessions',$data); echo $scrape->result; So that's basically it. Now you are logged in and can scrape around and request other pages as you normally would. Sorry it wasn't a longer post. I really do enjoy this kind of stuff so if anyone has a request, hit me up. Errors? 1) Make sure that you are properly parsing the token variable 2) Make sure that you uncommented the lines about CURLOPT_COOKIEFILE and CURLOPT_COOKIEJAR, those options need to be enabled and be sure the path set is writable by your application 3) Make sure that the path to the cookie file is writable and that it is getting data written to it 4) If you get a message about being redirected you need to uncomment the line about CURLOPT_FOLLOWLOCATION, that option needs to be enabled true

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• SQL SERVER – Merge Operations – Insert, Update, Delete in Single Execution

  - by pinaldave

  This blog post is written in response to T-SQL Tuesday hosted by Jorge Segarra (aka SQLChicken). I have been very active using these Merge operations in my development. However, I have found out from my consultancy work and friends that these amazing operations are not utilized by them most of the time. Here is my attempt to bring the necessity of using the Merge Operation to surface one more time. MERGE is a new feature that provides an efficient way to do multiple DML operations. In earlier versions of SQL Server, we had to write separate statements to INSERT, UPDATE, or DELETE data based on certain conditions; however, at present, by using the MERGE statement, we can include the logic of such data changes in one statement that even checks when the data is matched and then just update it, and similarly, when the data is unmatched, it is inserted. One of the most important advantages of MERGE statement is that the entire data are read and processed only once. In earlier versions, three different statements had to be written to process three different activities (INSERT, UPDATE or DELETE); however, by using MERGE statement, all the update activities can be done in one pass of database table. I have written about these Merge Operations earlier in my blog post over here SQL SERVER – 2008 – Introduction to Merge Statement – One Statement for INSERT, UPDATE, DELETE. I was asked by one of the readers that how do we know that this operator was doing everything in single pass and was not calling this Merge Operator multiple times. Let us run the same example which I have used earlier; I am listing the same here again for convenience. --Let’s create Student Details and StudentTotalMarks and inserted some records. USE tempdb GO CREATE TABLE StudentDetails ( StudentID INTEGER PRIMARY KEY, StudentName VARCHAR(15) ) GO INSERT INTO StudentDetails VALUES(1,'SMITH') INSERT INTO StudentDetails VALUES(2,'ALLEN') INSERT INTO StudentDetails VALUES(3,'JONES') INSERT INTO StudentDetails VALUES(4,'MARTIN') INSERT INTO StudentDetails VALUES(5,'JAMES') GO CREATE TABLE StudentTotalMarks ( StudentID INTEGER REFERENCES StudentDetails, StudentMarks INTEGER ) GO INSERT INTO StudentTotalMarks VALUES(1,230) INSERT INTO StudentTotalMarks VALUES(2,255) INSERT INTO StudentTotalMarks VALUES(3,200) GO -- Select from Table SELECT * FROM StudentDetails GO SELECT * FROM StudentTotalMarks GO -- Merge Statement MERGE StudentTotalMarks AS stm USING (SELECT StudentID,StudentName FROM StudentDetails) AS sd ON stm.StudentID = sd.StudentID WHEN MATCHED AND stm.StudentMarks > 250 THEN DELETE WHEN MATCHED THEN UPDATE SET stm.StudentMarks = stm.StudentMarks + 25 WHEN NOT MATCHED THEN INSERT(StudentID,StudentMarks) VALUES(sd.StudentID,25); GO -- Select from Table SELECT * FROM StudentDetails GO SELECT * FROM StudentTotalMarks GO -- Clean up DROP TABLE StudentDetails GO DROP TABLE StudentTotalMarks GO The Merge Join performs very well and the following result is obtained. Let us check the execution plan for the merge operator. You can click on following image to enlarge it. Let us evaluate the execution plan for the Table Merge Operator only. We can clearly see that the Number of Executions property suggests value 1. Which is quite clear that in a single PASS, the Merge Operation completes the operations of Insert, Update and Delete. I strongly suggest you all to use this operation, if possible, in your development. I have seen this operation implemented in many data warehousing applications. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: Pinal Dave, SQL, SQL Authority, SQL Joins, SQL Query, SQL Scripts, SQL Server, SQL Tips and Tricks, T SQL, Technology Tagged: Merge

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• jQuery Templates on Microsoft Ajax CDN

  - by Stephen Walther

  The beta version of the jQuery Templates plugin is now hosted on the Microsoft Ajax CDN. You can start using the jQuery Templates plugin in your application by referencing both jQuery 1.4.2 and jQuery Templates from the CDN. Here are the two script tags that you will want to use when developing an application: <script type="text/javascript" src=”http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.js”></script> <script type="text/javascript" src=”http://ajax.microsoft.com/ajax/jquery.templates/beta1/jquery.tmpl.js”></script> In addition, minified versions of both files are available from the CDN: <script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.min.js"></script> <script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery.templates/beta1/jquery.tmpl.min.js"></script> Here’s a full code sample of using jQuery Templates from the CDN to display pictures of cats from Flickr: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Cats</title> <style type="text/css"> html { background-color:Orange; } #catBox div { width:250px; height:250px; border:solid 1px black; background-color:White; margin:5px; padding:5px; float:left; } #catBox img { width:200px; height: 200px; } </style> </head> <body> <h1>Cat Photos!</h1> <div id="catBox"></div> <script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery/jquery-1.4.2.min.js"></script> <script type="text/javascript" src="http://ajax.microsoft.com/ajax/jquery.templates/beta1/jquery.tmpl.min.js"></script> <script id="catTemplate" type="text/x-jquery-tmpl"> <div> <b>${title}</b> <br /> <img src="${media.m}" /> </div> </script> <script type="text/javascript"> var url = "http://api.flickr.com/services/feeds/groups_pool.gne?id=44124373027@N01&lang=en-us&format=json&jsoncallback=?"; // Grab some flickr images of cats $.getJSON(url, function (data) { // Format the data using the catTemplate template $("#catTemplate").tmpl(data.items).appendTo("#catBox"); }); </script> </body> </html> This page displays a list of cats retrieved from Flickr: Notice that the cat pictures are retrieved and rendered with just a few lines of code: var url = "http://api.flickr.com/services/feeds/groups_pool.gne?id=44124373027@N01&lang=en-us&format=json&jsoncallback=?"; // Grab some flickr images of cats $.getJSON(url, function (data) { // Format the data using the catTemplate template $("#catTemplate").tmpl(data.items).appendTo("#catBox"); }); The final line of code, the one that calls the tmpl() method, uses the Templates plugin to render the cat photos in a template named catTemplate. The catTemplate template is contained within a SCRIPT element with type="text/x-jquery-tmpl". The jQuery Templates plugin is an “official” jQuery plugin which will be included in jQuery 1.5 (the next major release of jQuery). You can read the full documentation for the plugin at the jQuery website: http://api.jquery.com/category/plugins/templates/ The jQuery Templates plugin is still beta so we would really appreciate your feedback on the plugin. Let us know if you use the Templates plugin in your website.

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• How To Clear An Alert - Part 2

  - by werner.de.gruyter

  There were some interesting comments and remarks on the original posting, so I decided to do a follow-up and address some of the issues that got raised... Handling Metric Errors First of all, there is a significant difference between an 'error' and an 'alert'. An 'alert' is the violation of a condition (a threshold) specified for a given metric. That means that the Agent is collecting and gathering the data for the metric, but there is a situation that requires the attention of an administrator. An 'error' on the other hand however, is a failure to collect metric data: The Agent is throwing the error because it cannot determine the value for the metric Whereas the 'alert' guarantees continuity of the metric data, an 'error' signals a big unknown. And the unknown aspect of all this is what makes an error a lot more serious than a regular alert: If you don't know what the current state of affairs is, there could be some serious issues brewing that nobody is aware of... The life-cycle of a Metric Error Clearing a metric error is pretty much the same workflow as a metric 'alert': The Agent signals the error after it failed to execute the metric The error is uploaded to the OMS/repository, where it becomes visible in the Console The error will remain active until the Agent is able to execute the metric successfully. Even though the metric is still getting scheduled and executed on a regular basis, the error will remain outstanding as long as the Agent is not capable of executing the metric correctly Knowing this, the way to fix the metric error should be obvious: Take the 'problem' away, and as soon as the metric is executed again (based on the frequency of the metric), the error will go away. The same tricks used to clear alerts can be used here too: Wait for the next scheduled execution. For those metrics that are executed regularly (like every 15 minutes or so), it's just a matter of waiting those minutes to see the updates. The 'Reevaluate Alert' button can be used to force a re-execution of the metric. In case a metric is executed once a day, this will be a better way to make sure that the underlying problem has been solved. And if it has been, the metric error will be removed, and the regular data points will be uploaded to the repository. And just in case you have to 'force' the issue a little: If you disable and re-enable a metric, it will get re-scheduled. And that means a new metric execution, and an update of the (hopefully) fixed problem. Database server-generated alerts and problem checkers There are various ways the Agent can collect metric data: Via a script or a SQL statement, reading a log file, getting a value from an SNMP OID or listening for SNMP traps or via the DBMS_SERVER_ALERTS mechanism of an Oracle database. For those alert which are generated by the database (like tablespace metrics for 10g and above databases), the Agent just 'waits' for the database to report any new findings. If the Agent has lost the current state of the server-side metrics (due to an incomplete recovery after a disaster, or after an improper use of the 'emctl clearstate' command), the Agent might be still aware of an alert that the database no longer has (or vice versa). The same goes for 'problem checker' alerts: Those metrics that only report data if there is a problem (like the 'invalid objects' metric) will also have a problem if the Agent state has been tampered with (again, the incomplete recovery, and after improper use of 'emctl clearstate' are the two main causes for this). The best way to deal with these kinds of mismatches, is to simple disable and re-enable the metric again: The disabling will clear the state of the metric, and the re-enabling will force a re-execution of the metric, so the new and updated results can get uploaded to the repository. Starting 10gR5, the Agent performs additional checks and verifications after each restart of the Agent and/or each state change of the database (shutdown/startup or failover in case of DataGuard) to catch these kinds of mismatches.

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• MongoDB usage best practices

  - by andresv

  The project I'm working on uses MongoDB for some stuff so I'm creating some documents to help developers speedup the learning curve and also avoid mistakes and help them write clean & reliable code. This is my first version of it, so I'm pretty sure I will be adding more stuff to it, so stay tuned! C# Official driver notes The 10gen official MongoDB driver should always be referenced in projects by using NUGET. Do not manually download and reference assemblies in any project. C# driver quickstart guide: http://www.mongodb.org/display/DOCS/CSharp+Driver+Quickstart Reference links C# Language Center: http://www.mongodb.org/display/DOCS/CSharp+Language+Center MongoDB Server Documentation: http://www.mongodb.org/display/DOCS/Home MongoDB Server Downloads: http://www.mongodb.org/downloads MongoDB client drivers download: http://www.mongodb.org/display/DOCS/Drivers MongoDB Community content: http://www.mongodb.org/display/DOCS/CSharp+Community+Projects Tutorials Tutorial MongoDB con ASP.NET MVC - Ejemplo Práctico (Spanish):http://geeks.ms/blogs/gperez/archive/2011/12/02/tutorial-mongodb-con-asp-net-mvc-ejemplo-pr-225-ctico.aspx MongoDB and C#:http://www.codeproject.com/Articles/87757/MongoDB-and-C C# driver LINQ tutorial:http://www.mongodb.org/display/DOCS/CSharp+Driver+LINQ+Tutorial C# driver reference: http://www.mongodb.org/display/DOCS/CSharp+Driver+Tutorial Safe Mode Connection The C# driver supports two connection modes: safe and unsafe. Safe connection mode (only applies to methods that modify data in a database like Inserts, Deletes and Updates. While the current driver defaults to unsafe mode (safeMode == false) it's recommended to always enable safe mode, and force unsafe mode on specific things we know aren't critical. When safe mode is enabled, the driver internal code calls the MongoDB "getLastError" function to ensure the last operation is completed before returning control the the caller. For more information on using safe mode and their implicancies on performance and data reliability see: http://www.mongodb.org/display/DOCS/getLastError+Command If safe mode is not enabled, all data modification calls to the database are executed asynchronously (fire & forget) without waiting for the result of the operation. This mode could be useful for creating / updating non-critical data like performance counters, usage logging and so on. It's important to know that not using safe mode implies that data loss can occur without any notification to the caller. As with any wait operation, enabling safe mode also implies dealing with timeouts. For more information about C# driver safe mode configuration see: http://www.mongodb.org/display/DOCS/CSharp+getLastError+and+SafeMode The safe mode configuration can be specified at different levels: Connection string: mongodb://hostname/?safe=true Database: when obtaining a database instance using the server.GetDatabase(name, safeMode) method Collection: when obtaining a collection instance using the database.GetCollection(name, safeMode) method Operation: for example, when executing the collection.Insert(document, safeMode) method Some useful SafeMode article: http://stackoverflow.com/questions/4604868/mongodb-c-sharp-safemode-official-driver Exception Handling The driver ensures that an exception will be thrown in case of something going wrong, in case of using safe mode (as said above, when not using safe mode no exception will be thrown no matter what the outcome of the operation is). As explained here https://groups.google.com/forum/?fromgroups#!topic/mongodb-user/mS6jIq5FUiM there is no need to check for any returned value from a driver method inserting data. With updates the situation is similar to any other relational database: if an update command doesn't affect any records, the call will suceed anyway (no exception thrown) and you manually have to check for something like "records affected". For MongoDB, an Update operation will return an instance of the "SafeModeResult" class, and you can verify the "DocumentsAffected" property to ensure the intended document was indeed updated. Note: Please remember that an Update method might return a null instance instead of an "SafeModeResult" instance when safe mode is not enabled. Useful Community Articles Comments about how MongoDB works and how that might affect your application: http://ethangunderson.com/blog/two-reasons-to-not-use-mongodb/ FourSquare using MongoDB had serious scalability problems: http://mashable.com/2010/10/07/mongodb-foursquare/ Is MongoDB a replacement for Memcached? http://www.quora.com/Is-MongoDB-a-good-replacement-for-Memcached/answer/Rick-Branson MongoDB Introduction, shell, when not to use, maintenance, upgrade, backups, memory, sharding, etc: http://www.markus-gattol.name/ws/mongodb.html MongoDB Collection level locking support: https://jira.mongodb.org/browse/SERVER-1240 MongoDB performance tips: http://www.quora.com/MongoDB/What-are-some-best-practices-for-optimal-performance-of-MongoDB-particularly-for-queries-that-involve-multiple-documents Lessons learned migrating from SQL Server to MongoDB: http://www.wireclub.com/development/TqnkQwQ8CxUYTVT90/read MongoDB replication performance: http://benshepheard.blogspot.com.ar/2011/01/mongodb-replication-performance.html

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• Beware when using .NET's named pipes in a windows forms application

  - by FransBouma

  Yesterday a user of our .net ORM Profiler tool reported that he couldn't get the snapshot recording from code feature working in a windows forms application. Snapshot recording in code means you start recording profile data from within the profiled application, and after you're done you save the snapshot as a file which you can open in the profiler UI. When using a console application it worked, but when a windows forms application was used, the snapshot was always empty: nothing was recorded. Obviously, I wondered why that was, and debugged a little. Here's an example piece of code to record the snapshot. This piece of code works OK in a console application, but results in an empty snapshot in a windows forms application: var snapshot = new Snapshot(); snapshot.Record(); using(var ctx = new ORMProfilerTestDataContext()) { var customers = ctx.Customers.Where(c => c.Country == "USA").ToList(); } InterceptorCore.Flush(); snapshot.Stop(); string error=string.Empty; if(!snapshot.IsEmpty) { snapshot.SaveToFile(@"c:\temp\generatortest\test2\blaat.opsnapshot", out error); } if(!string.IsNullOrEmpty(error)) { Console.WriteLine("Save error: {0}", error); } (the Console.WriteLine doesn't do anything in a windows forms application, but you get the idea). ORM Profiler uses named pipes: the interceptor (referenced and initialized in your application, the application to profile) sends data over the named pipe to a listener, which when receiving a piece of data begins reading it, asynchronically, and when properly read, it will signal observers that new data has arrived so they can store it in a repository. In this case, the snapshot will be the observer and will store the data in its own repository. The reason the above code doesn't work in windows forms is because windows forms is a wrapper around Win32 and its WM_* message based system. Named pipes in .NET are wrappers around Windows named pipes which also work with WM_* messages. Even though we use BeginRead() on the named pipe (which spawns a thread to read the data from the named pipe), nothing is received by the named pipe in the windows forms application, because it doesn't handle the WM_* messages in its message queue till after the method is over, as the message pump of a windows forms application is handled by the only thread of the windows forms application, so it will handle WM_* messages when the application idles. The fix is easy though: add Application.DoEvents(); right before snapshot.Stop(). Application.DoEvents() forces the windows forms application to process all WM_* messages in its message queue at that moment: all messages for the named pipe are then handled, the .NET code of the named pipe wrapper will react on that and the whole process will complete as if nothing happened. It's not that simple to just say 'why didn't you use a worker thread to create the snapshot here?', because a thread doesn't get its own message pump: the messages would still be posted to the window's message pump. A hidden form would create its own message pump, so the additional thread should also create a window to get the WM_* messages of the named pipe posted to a different message pump than the one of the main window. This WM_* messages pain is not something you want to be confronted with when using .NET and its libraries. Unfortunately, the way they're implemented, a lot of APIs are leaky abstractions, they bleed the characteristics of the OS objects they hide away through to the .NET code. Be aware of that fact when using them :)

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• SEO: Nested List vs List, Split Over Divs vs Definition List

  - by Jon P

  From an SEO perspective which, if any, is better: Option 1: Nested lists with h2 tags <ul id="mainpoints"> <li><h2>Powerful Analysis</h2> <ul> <li>Charting and indicators</li> <li>Daily trading signals</li> <li>Company health checks</li> </ul> </li> <li><h2>World Market Data</h2> <ul> [List Items removed for brevity] </ul> </li> <li><h2>Daily Market Data</h2> <ul> [List Items removed for brevity] </ul> </li> </ul> Option 2: Divs with h2 and lists <div id="mainpoints"> <div> <h2>Powerful Analysis</h2> <ul> <li>Charting and indicators</li> <li>Daily trading signals</li> <li>Company health checks</li> </ul> </div> <div> <h2>World Market Data</h2> <ul> [List Items removed for brevity] </ul> </div> <div> <h2>Daily Market Data</h2> <ul> [List Items removed for brevity] </ul> </div> </div> Option 3: Definition List <dl id="mainpoints"> <dt>Powerful Analysis</dt> <dd>- Charting and indicators</dd> <dd>- Daily trading signals</dd> <dd>- Company health checks</dd> <dt>World Market Data</dt> [List Items removed for brevity] <dt>Daily Market Data</dt> [List Items removed for brevity] </dl> My instincts tell me that semanticaly the pure list options (1 & 3) are the best and that h2 may be more SEO friendly (1 & 2) which would point to option 1 as being the best option. I do love the lean makeup of the definition list but will I take an SEO hit by losing the h2 tags? Before anyone asks, h2 is not valid markup in a dt tag. Are my instincts right with a nested list being the way to go?

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• SQLAuthority News – Android Efficiency Tips and Tricks – Personal Technology Tip #003

  - by pinaldave

  I use my phone for lots of things.  I use it mainly to replace my tablet – I can e-mail, take and edit photos, and do almost everything I can do on a laptop with this phone.  And I am sure that there are many of you out there just like me.  I personally have a Galaxy S3, which uses the Android operating system, and I have decided to feature it as the third installment of my Technology Tips and Tricks series. 1) Shortcut to your favorite contacts on home screen Access your most-called contacts easily from your home screen by holding your finger on any empty spot on the home screen.  A menu will pop up that allows you to choose Shortcuts, and Contact.  You can scroll through your contact list and then just tap on the name of the person you want to be able to dial with a single click. 2) Keep track of your data usage Yes, we all should keep a close eye on our data usage, because it is very easy to go over our limits and then end up with a giant bill at the end of the month.  Never get surprised when you open that mobile phone envelope again.  Go to Settings, then Data Usage, and you can find a quick rundown of your usage, how much data each app uses, and you can even set alarms to let you know when you are nearing the limits.   Better yet, you can set the phone to stop using data when it reaches a certain limit. 3) Bring back Good Grammar We often hear proclamations about the downfall of written language, and how texting abbreviations, misspellings, and lack of punctuation are the root of all evil.  Well, we can show all those doomsdayers that all is not lost by bringing punctuation back to texting.  Usually we leave it off when we text because it takes too long to get to the screen with all the punctuation options.  But now you can hold down the period (or “full stop”) button and a list of all the commonly-used punctuation marks will pop right up. 4) Apps, Apps, Apps and Apps And finally, I cannot end an article about smart phones without including a list of my favorite apps.  Here are a list of my Top 10 Applications on my Android (not counting social media apps). Advanced Task Killer – Keeps my phone snappy by closing un-necessary apps WhatsApp - my favorite alternate to Text SMS Flipboard - my ‘timepass’ moments Skype – keeps me close to friends and family GoogleMaps - I am never lost because of this one thing Amazon Kindle – Books my best friends DropBox - My data always safe Pluralsight Player – Learning never stops for me Samsung Kies Air – Connecting Phone to Computer Chrome – Replacing default browser I have not included any social media applications in the above list, but you can be sure that I am linked to Twitter, Facebook, Google+, LinkedIn, and YouTube. Reference: Pinal Dave (http://blog.SQLAuthority.com)   Filed under: Best Practices, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, T SQL, Technology Tagged: Android, Personal Technology

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• WCF RIA Services DomainContext Abstraction Strategies–Say That 10 Times!

  - by dwahlin

  The DomainContext available with WCF RIA Services provides a lot of functionality that can help track object state and handle making calls from a Silverlight client to a DomainService. One of the questions I get quite often in our Silverlight training classes (and see often in various forums and other areas) is how the DomainContext can be abstracted out of ViewModel classes when using the MVVM pattern in Silverlight applications. It’s not something that’s super obvious at first especially if you don’t work with delegates a lot, but it can definitely be done. There are various techniques and strategies that can be used but I thought I’d share some of the core techniques I find useful. To start, let’s assume you have the following ViewModel class (this is from my Silverlight Firestarter talk available to watch online here if you’re interested in getting started with WCF RIA Services): public class AdminViewModel : ViewModelBase { BookClubContext _Context = new BookClubContext(); public AdminViewModel() { if (!DesignerProperties.IsInDesignTool) { LoadBooks(); } } private void LoadBooks() { _Context.Load(_Context.GetBooksQuery(), LoadBooksCallback, null); } private void LoadBooksCallback(LoadOperation<Book> books) { Books = new ObservableCollection<Book>(books.Entities); } } Notice that BookClubContext is being used directly in the ViewModel class. There’s nothing wrong with that of course, but if other ViewModel objects need to load books then code would be duplicated across classes. Plus, the ViewModel has direct knowledge of how to load data and I like to make it more loosely-coupled. To do this I create what I call a “Service Agent” class. This class is responsible for getting data from the DomainService and returning it to a ViewModel. It only knows how to get and return data but doesn’t know how data should be stored and isn’t used with data binding operations. An example of a simple ServiceAgent class is shown next. Notice that I’m using the Action<T> delegate to handle callbacks from the ServiceAgent to the ViewModel object. Because LoadBooks accepts an Action<ObservableCollection<Book>>, the callback method in the ViewModel must accept ObservableCollection<Book> as a parameter. The callback is initiated by calling the Invoke method exposed by Action<T>: public class ServiceAgent { BookClubContext _Context = new BookClubContext(); public void LoadBooks(Action<ObservableCollection<Book>> callback) { _Context.Load(_Context.GetBooksQuery(), LoadBooksCallback, callback); } public void LoadBooksCallback(LoadOperation<Book> lo) { //Check for errors of course...keeping this brief var books = new ObservableCollection<Book>(lo.Entities); var action = (Action<ObservableCollection<Book>>)lo.UserState; action.Invoke(books); } } This can be simplified by taking advantage of lambda expressions. Notice that in the following code I don’t have a separate callback method and don’t have to worry about passing any user state or casting any user state (the user state is the 3rd parameter in the _Context.Load method call shown above). public class ServiceAgent { BookClubContext _Context = new BookClubContext(); public void LoadBooks(Action<ObservableCollection<Book>> callback) { _Context.Load(_Context.GetBooksQuery(), (lo) => { var books = new ObservableCollection<Book>(lo.Entities); callback.Invoke(books); }, null); } } A ViewModel class can then call into the ServiceAgent to retrieve books yet never know anything about the DomainContext object or even know how data is loaded behind the scenes: public class AdminViewModel : ViewModelBase { ServiceAgent _ServiceAgent = new ServiceAgent(); public AdminViewModel() { if (!DesignerProperties.IsInDesignTool) { LoadBooks(); } } private void LoadBooks() { _ServiceAgent.LoadBooks(LoadBooksCallback); } private void LoadBooksCallback(ObservableCollection<Book> books) { Books = books } } You could also handle the LoadBooksCallback method using a lambda if you wanted to minimize code just like I did earlier with the LoadBooks method in the ServiceAgent class.  If you’re into Dependency Injection (DI), you could create an interface for the ServiceAgent type, reference it in the ViewModel and then inject in the object to use at runtime. There are certainly other techniques and strategies that can be used, but the code shown here provides an introductory look at the topic that should help get you started abstracting the DomainContext out of your ViewModel classes when using WCF RIA Services in Silverlight applications.

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• SQLAuthority News – Android Efficiency Tips and Tricks – Personal Technology Tip

  - by pinaldave

  I use my phone for lots of things.  I use it mainly to replace my tablet – I can e-mail, take and edit photos, and do almost everything I can do on a laptop with this phone.  And I am sure that there are many of you out there just like me.  I personally have a Galaxy S3, which uses the Android operating system, and I have decided to feature it as the third installment of my Technology Tips and Tricks series. 1) Shortcut to your favorite contacts on home screen Access your most-called contacts easily from your home screen by holding your finger on any empty spot on the home screen.  A menu will pop up that allows you to choose Shortcuts, and Contact.  You can scroll through your contact list and then just tap on the name of the person you want to be able to dial with a single click. 2) Keep track of your data usage Yes, we all should keep a close eye on our data usage, because it is very easy to go over our limits and then end up with a giant bill at the end of the month.  Never get surprised when you open that mobile phone envelope again.  Go to Settings, then Data Usage, and you can find a quick rundown of your usage, how much data each app uses, and you can even set alarms to let you know when you are nearing the limits.   Better yet, you can set the phone to stop using data when it reaches a certain limit. 3) Bring back Good Grammar We often hear proclamations about the downfall of written language, and how texting abbreviations, misspellings, and lack of punctuation are the root of all evil.  Well, we can show all those doomsdayers that all is not lost by bringing punctuation back to texting.  Usually we leave it off when we text because it takes too long to get to the screen with all the punctuation options.  But now you can hold down the period (or “full stop”) button and a list of all the commonly-used punctuation marks will pop right up. 4) Apps, Apps, Apps and Apps And finally, I cannot end an article about smart phones without including a list of my favorite apps.  Here are a list of my Top 10 Applications on my Android (not counting social media apps). Advanced Task Killer – Keeps my phone snappy by closing un-necessary apps WhatsApp - my favorite alternate to Text SMS Flipboard - my ‘timepass’ moments Skype – keeps me close to friends and family GoogleMaps - I am never lost because of this one thing Amazon Kindle – Books my best friends DropBox - My data always safe Pluralsight Player – Learning never stops for me Samsung Kies Air – Connecting Phone to Computer Chrome – Replacing default browser I have not included any social media applications in the above list, but you can be sure that I am linked to Twitter, Facebook, Google+, LinkedIn, and YouTube. Reference: Pinal Dave (http://blog.SQLAuthority.com)   Filed under: Best Practices, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, SQLAuthority News, T SQL, Technology Tagged: Android, Personal Technology

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• Banshee encountered a Fatal Error (sqlite error 11: database disk image is malformed)

  - by Nik

  I am running ubuntu 10.10 Maverick Meerkat, and recently I am helping in testing out indicator-weather using the unstable buids. However there was a bug which caused my system to freeze suddenly (due to indicator-weather not ubuntu) and the only way to recover is to do a hard reset of the system. This happened a couple of times. And when i tried to open banshee after a couple of such resets I get the following fatal error which forces me to quit banshee. The screenshot is not clear enough to read the error, so I am posting it below, An unhandled exception was thrown: Sqlite error 11: database disk image is malformed (SQL: BEGIN TRANSACTION; DELETE FROM CoreSmartPlaylistEntries WHERE SmartPlaylistID IN (SELECT SmartPlaylistID FROM CoreSmartPlaylists WHERE IsTemporary = 1); DELETE FROM CoreSmartPlaylists WHERE IsTemporary = 1; COMMIT TRANSACTION) at Hyena.Data.Sqlite.Connection.CheckError (Int32 errorCode, System.String sql) [0x00000] in <filename unknown>:0 at Hyena.Data.Sqlite.Connection.Execute (System.String sql) [0x00000] in <filename unknown>:0 at Hyena.Data.Sqlite.HyenaSqliteCommand.Execute (Hyena.Data.Sqlite.HyenaSqliteConnection hconnection, Hyena.Data.Sqlite.Connection connection) [0x00000] in <filename unknown>:0 Exception has been thrown by the target of an invocation. at System.Reflection.MonoCMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 at System.Reflection.MonoCMethod.Invoke (BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) [0x00000] in <filename unknown>:0 at System.Reflection.ConstructorInfo.Invoke (System.Object[] parameters) [0x00000] in <filename unknown>:0 at System.Activator.CreateInstance (System.Type type, Boolean nonPublic) [0x00000] in <filename unknown>:0 at System.Activator.CreateInstance (System.Type type) [0x00000] in <filename unknown>:0 at Banshee.Gui.GtkBaseClient.Startup () [0x00000] in <filename unknown>:0 at Hyena.Gui.CleanRoomStartup.Startup (Hyena.Gui.StartupInvocationHandler startup) [0x00000] in <filename unknown>:0 .NET Version: 2.0.50727.1433 OS Version: Unix 2.6.35.27 Assembly Version Information: gkeyfile-sharp (1.0.0.0) Banshee.AudioCd (1.9.0.0) Banshee.MiniMode (1.9.0.0) Banshee.CoverArt (1.9.0.0) indicate-sharp (0.4.1.0) notify-sharp (0.4.0.0) Banshee.SoundMenu (1.9.0.0) Banshee.Mpris (1.9.0.0) Migo (1.9.0.0) Banshee.Podcasting (1.9.0.0) Banshee.Dap (1.9.0.0) Banshee.LibraryWatcher (1.9.0.0) Banshee.MultimediaKeys (1.9.0.0) Banshee.Bpm (1.9.0.0) Banshee.YouTube (1.9.0.0) Banshee.WebBrowser (1.9.0.0) Banshee.Wikipedia (1.9.0.0) pango-sharp (2.12.0.0) Banshee.Fixup (1.9.0.0) Banshee.Widgets (1.9.0.0) gio-sharp (2.14.0.0) gudev-sharp (1.0.0.0) Banshee.Gio (1.9.0.0) Banshee.GStreamer (1.9.0.0) System.Configuration (2.0.0.0) NDesk.DBus.GLib (1.0.0.0) gconf-sharp (2.24.0.0) Banshee.Gnome (1.9.0.0) Banshee.NowPlaying (1.9.0.0) Mono.Cairo (2.0.0.0) System.Xml (2.0.0.0) Banshee.Core (1.9.0.0) Hyena.Data.Sqlite (1.9.0.0) System.Core (3.5.0.0) gdk-sharp (2.12.0.0) Mono.Addins (0.4.0.0) atk-sharp (2.12.0.0) Hyena.Gui (1.9.0.0) gtk-sharp (2.12.0.0) Banshee.ThickClient (1.9.0.0) Nereid (1.9.0.0) NDesk.DBus.Proxies (0.0.0.0) Mono.Posix (2.0.0.0) NDesk.DBus (1.0.0.0) glib-sharp (2.12.0.0) Hyena (1.9.0.0) System (2.0.0.0) Banshee.Services (1.9.0.0) Banshee (1.9.0.0) mscorlib (2.0.0.0) Platform Information: Linux 2.6.35-27-generic i686 unknown GNU/Linux Disribution Information: [/etc/lsb-release] DISTRIB_ID=Ubuntu DISTRIB_RELEASE=10.10 DISTRIB_CODENAME=maverick DISTRIB_DESCRIPTION="Ubuntu 10.10" [/etc/debian_version] squeeze/sid Just to make it clear, this happened only after the hard resets and not before. I used to use banshee everyday and it worked perfectly. Can anyone help me fix this?

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• Oracle Database 11.2.0.4 Certified with EBS on Microsoft Windows Server

  - by John Abraham

  As a follow up to to a previous announcement, Oracle Database 11g Release 2 (11.2.0.4) is now certified with Oracle E-Business Suite Release 11i and Release 12 on the following Microsoft Windows Server operating systems: Release 12.2 (12.2.3 and higher): Microsoft Windows x64 (64-bit) (2008 R2) Release 12.1 (12.1.1 and higher): Microsoft Windows Server (32-bit) (2003, 2008) Microsoft Windows x64 (64-bit) (20031, 20081, 2008 R22) Release 12.0 (12.0.4 and higher): Microsoft Windows Server (32-bit) (2003) Microsoft Windows x64 (64-bit) (2003, 2008, 2008 R2)1 Release 11i (11.5.10.2 + ATG PF.H RUP 6 and higher):: Microsoft Windows Server (32-bit) (2003, 20081) Microsoft Windows x64 (64-bit) (2003, 2008, 2008 R2)1 Notes: 1: This OS is a 'database tier only' or 'split tier configuration' platform where the application tier must be on a fully certified E-Business Suite platform. 2: This OS is a 'database tier only' platform for Release 11i. For 12.1.1 or higher, it is also supported on the application tier via the migration process outlined in My Oracle Support Document 1188535.1. This announcement for Oracle E-Business Suite 11i and R12 includes: Oracle Database 11gR2 version 11.2.0.4 Oracle Database 11gR2 version 11.2.0.4 Real Application Clusters (RAC) Oracle Database Vault 11gR2 version 11.2.0.4 Transparent Data Encryption (Column Encryption) using Oracle Database 11gR2 version 11.2.0.4 TDE Tablespace Encryption using Oracle Database 11gR2 version 11.2.0.4 Advanced Security Option (ASO)/Advanced Networking Option (ANO) with Oracle Database 11gR2 version 11.2.0.4 Export/Import Process for Oracle E-Business Suite Release 11i and Release 12 Database Instances Transportable Database and Transportable Tablespaces Data Migration Processes for Oracle E-Business Suite Release 11i and Release 12 Certification data in My Oracle Support (http://support.oracle.com) has been updated with this certification - please review the documents below for all requirements and additional details: Where can I find more information? MOS Document 881505.1 - Interoperability Notes - Oracle E-Business Suite Release 11i with Oracle Database 11g Release 2 (11.2.0) MOS Document 1058763.1 - Interoperability Notes - Oracle E-Business Suite Release 12 with Oracle Database 11g Release 2 (11.2.0) MOS Dcoument 1623879.1 - Interoperability Notes - Oracle E-Business Suite Release 12.2 with Oracle Database 11g Release 2 (11.2.0) MOS Document 1091086.1 - Integrating Oracle E-Business Suite Release 11i with Oracle Database Vault 11gR2 MOS Document 1091083.1 - Integrating Oracle E-Business Suite Release 12 with Oracle Database Vault 11gR2 MOS Document 216205.1 - Database Initialization Parameters for Oracle E-Business Suite 11i MOS Document 396009.1 - Database Initialization Parameters for Oracle Applications Release 12 MOS Document 823586.1 - Using Oracle 11g Release 2 Real Application Clusters with Oracle E-Business Suite Release 11i MOS Document 823587.1 - Using Oracle 11g Release 2 Real Application Clusters with Oracle E-Business Suite Release 12 MOS Document 946413.1 - Using Oracle Applications with a Split Configuration Database Tier on Oracle Release 11g Release 2 MOS Document 403294.1 - Using Transparent Data Encryption (TDE) Column Encryption with Oracle E-Business Suite Release 11i MOS Document 732764.1 - Using Transparent Data Encryption (TDE) Column Encryption with Oracle E-Business Suite Release 12 MOS Document 828223.1 - Using TDE Tablespace Encryption with Oracle E-Business Suite Release 11i MOS Document 828229.1 - Using TDE Tablespace Encryption with Oracle E-Business Suite Release 12 MOS Document 391248.1 - Encrypting Oracle E-Business Suite Release 11i Network Traffic using Advanced Security Option and Advanced Networking Option MOS Document 376700.1 - Enabling SSL in Oracle Application Release 12 MOS Document 732764.1 - Using Transparent Data Encryption (TDE) Column Encryption with Oracle E-Business Suite Release 12 MOS Document 557738.1 - Export/Import Process for Oracle E-Business Suite Release 11i Database Instances Using Oracle Database 11g Release 1 or 11g Release 2 MOS Document 741818.1 - Export/Import Process for Oracle E-Business Suite Release 12 Database Instances Using Oracle Database 11g Release 1 or 11g Release 2 MOS Document 1366265.1 - Using Transportable Tablespaces to Migrate Oracle Applications 11i Using Oracle Database 11g Release 2 MOS Document 1311487.1 - Using Transportable Tablespaces to Migrate Oracle E-Business Suite Release 12 Using Oracle Database 11g Release 2 MOS Document 729309.1 - Using Transportable Database to Migrate Oracle E-Business Suite Release 11i Using Oracle Database 10g Release 2 or 11g MOS Document 734763.1 - Using Transportable Database to Migrate Oracle E-Business Suite Release 12 Using Oracle Database 10g Release 2 or 11g MOS Document 1188535.1 - Migrating Oracle E-Business Suite R12 to Microsoft Windows Server 2008 R2 MOS Dcoument 1349240.1 - Database Preparation Guidelines for an Oracle E-Business Suite Release 12.2 Upgrade MOS Document 1594274.1 - Oracle E-Business Suite Release 12.2: Consolidated List of Patches and Technology Bug Fixes Please also review the platform-specific Oracle Database Installation Guides for operating system and other prerequisites.

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• BIP BIServer Query Debug

  - by Tim Dexter

  With some help from Bryan, I have uncovered a way of being able to debug or at least log what BIServer is doing when BIP sends it a query request. This is not for those of you querying the database directly but if you are using the BIServer and its datamodel to fetch data for a BIP report. If you have written or used the query builder against BIServer and when you run the report it chokes with a cryptic message, that you have no clue about, read on. When BIP runs a piece of BIServer logical SQL to fetch data. It does not appear to validate it, it just passes it through, so what is BIServer doing on its end? As you may know, you are not writing regular physical sql its actually logical sql e.g. select Jobs."Job Title" as "Job Title", Employees."Last Name" as "Last Name", Employees.Salary as Salary, Locations."Department Name" as "Department Name", Locations."Country Name" as "Country Name", Locations."Region Name" as "Region Name" from HR.Locations Locations, HR.Employees Employees, HR.Jobs Jobs The tables might not even be a physical tables, we don't care, that's what the BIServer and its model are for. You have put all the effort into building the model, just go get me the data from where ever it might be. The BIServer takes the logical sql and uses its vast brain to work out what the physical SQL is, executes it and passes the result back to BIP. select distinct T32556.JOB_TITLE as c1, T32543.LAST_NAME as c2, T32543.SALARY as c3, T32537.DEPARTMENT_NAME as c4, T32532.COUNTRY_NAME as c5, T32577.REGION_NAME as c6 from JOBS T32556, REGIONS T32577, COUNTRIES T32532, LOCATIONS T32569, DEPARTMENTS T32537, EMPLOYEES T32543 where ( T32532.COUNTRY_ID = T32569.COUNTRY_ID and T32532.REGION_ID = T32577.REGION_ID and T32537.DEPARTMENT_ID = T32543.DEPARTMENT_ID and T32537.LOCATION_ID = T32569.LOCATION_ID and T32543.JOB_ID = T32556.JOB_ID ) Not a very tough example I know but you get the idea. How do I know what the BIServer is up to? How can I find out what the issue might be if BIServer chokes on my query? There are a couple of steps: In the Administrator tool you need to set the logging level for the Administrator user to something greater than the default '0'. '7' is going to give you the max. Just remember to take it back down after you have finished the debug. I needed to bounce my BIServer service Now here's the secret sauce. Prefix the following to your BIP query set variable LOGLEVEL = 7; Set the log level to that you have in the admin tool Now run your BIP report. With the prefix in place; BIServer will write to the NQQuery.log file. This is located in the ./OracleBI/server/Log directory. In there you are going to find the complete process the BIServer has gone through to try and get the data back for you A quick note, if the BIServer can, its going to hit that great BIEE cache to get your data and you may not see the full log. IF this is the case. Get inot hte Administration page (via the browser login) and clear out your BIP report cursor. Then re-run. This will hopefully help out if you are trying to debug that annoying BIP report that will not run or is getting some strange data. Don't forget to turn that logging level back down once you are done. This will avoid the DBA screaming at you for sucking up all the disk space on the system.

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• Analysis Services (SSAS) - Unexpected Internal Error when processing (ProcessUpdate). Workaround/Resolution

  - by James Rogers

  Many implementations require the use of ProcessUpdate to support Type 1 slowly changing dimensions. ProcessUpdate drops all of the affected indexes and aggregations in partitions affected by data that changes in the Dimension on which the ProcessUpdate is being performed. Twice now I have had situations where the processing fails with "Internal error: An unexpected exception occurred." Any subsequent ProcessUpdate processing will also fail with the same error. In talking with Microsoft the issue is corrupt indexes for the Dimension(s) being processed in the partitions of the affected measure group. I cannot guarantee that the following will correct your problem but it did in my case and saved us quite a bit of down time.   Workaround: ProcessIndexes on the entire cube that is being processed and throwing the error. This corrected the problem on both 2008 and 2008 R2.   Pros:  Does not require a complete rebuild of the data (ProcessFull) for either the Dimension or Cube. User access can continue while this ProcessIndexes in underway.   Cons: Can take a long time, especially on large cubes with many partitions, dimensions and/or aggregations. Query Performance is usually severely impacted due to the memory and CPU requirements for Aggregation and Index building   <Batch http://schemas.microsoft.com/analysisservices/2003/engine"http://schemas.microsoft.com/analysisservices/2003/engine">  <Parallel>     <Process xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ddl2="http://schemas.microsoft.com/analysisservices/2003/engine/2" xmlns:ddl2_2="http://schemas.microsoft.com/analysisservices/2003/engine/2/2" xmlns:ddl100_100="http://schemas.microsoft.com/analysisservices/2008/engine/100/100" xmlns:ddl200="http://schemas.microsoft.com/analysisservices/2010/engine/200" xmlns:ddl200_200="http://schemas.microsoft.com/analysisservices/2010/engine/200/200">       <Object>         <DatabaseID>MyDatabase</DatabaseID>         <CubeID>MyCube</CubeID>       </Object>       <Type>ProcessIndexes</Type>       <WriteBackTableCreation>UseExisting</WriteBackTableCreation>     </Process>  </Parallel> </Batch>   The cube where the corruption exists can be found by having Profiler running while the ProcessUpdate is executing. The first partition that displays the "The Job has ended in failure." message in the TextData column will be part of the cube/measuregroup that has the corruption. You can try to run ProcessIndexes on just that measure group. This may correct the problem and save additional time if you have other large measure groups in the cube that are not affected by the corruption.   Remember to execute your normal ProcessUpdate batch after the successful completion of the ProcessIndexes. The ProcessIndexes does not pick up data changes.   Things that did not work: ProcessClearIndexes - why this doesn't work and ProcessIndexes does is unclear at this point. ProcessFull on the partition in question. In my latest case, this would clear up the problem for that partition. However, the next partition the ProcessUpdate touched that had data in it would generate and error. This leads me to believe the corruption problem will exist in all partitions in the affected measure group that have data in them.   NOTE: I experience this problem in both a SQL 2008 and SQL 2008 R2 Analysis Services environment, on separate built from the same relational database. This leads me to believe that some data condition in the tables used for the Dimension processing caused the corruption since the two environments were on physically separate hardware. I am waiting on Microsoft to analyze the dumps to give us more insight into what actually caused the corruption and will update this post accordingly.

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• Having fun with Reflection

  - by Nick Harrison

  I was once asked in a technical interview what I could tell them about Reflection.   My response, while a little tongue in cheek was that "I can tell you it is one of my favorite topics to talk about" I did get a laugh out of that and it was a great ice breaker.    Reflection may not be the answer for everything, but it often can be, or maybe even should be.     I have posted in the past about my favorite CopyTo method.   It can come in several forms and is often very useful.   I explain it further and expand on the basic idea here  The basic idea is to allow reflection to loop through the properties of two objects and synchronize the ones that are in common.   I love this approach for data binding and passing data across the layers in an application. Recently I have been working on a project leveraging Data Transfer Objects to pass data through WCF calls.   We won't go into how the architecture got this way, but in essence there is a partial duplicate inheritance hierarchy where there is a related Domain Object for each Data Transfer Object.     The matching objects do not share a common ancestor or common interface but they will have the same properties in common.    By passing the problems with this approach, let's talk about how Reflection and our friendly CopyTo could make the most of this bad situation without having to change too much. One of the problems is keeping the two sets of objects in synch.   For this particular project, the DO has all of the functionality and the DTO is used to simply transfer data back and forth.    Both sets of object have parallel hierarchies with the same properties being defined at the corresponding levels.   So we end with BaseDO,  BaseDTO, GenericDO, GenericDTO, ProcessAreaDO,  ProcessAreaDTO, SpecializedProcessAreaDO, SpecializedProcessAreaDTO, TableDo, TableDto. and so on. Without using Reflection and a CopyTo function, tremendous care and effort must be made to keep the corresponding objects in synch.    New properties can be added at any level in the inheritance and must be kept in synch at all subsequent layers.    For this project we have come up with a clever approach of calling a base GetDo or UpdateDto making sure that the same method at each level of inheritance is called.    Each level is responsible for updating the properties at that level. This is a lot of work and not keeping it in synch can create all manner of problems some of which are very difficult to track down.    The other problem is the type of code that this methods tend to wind up with. You end up with code like this: Transferable dto = new Transferable(); base.GetDto(dto); dto.OfficeCode = GetDtoNullSafe(officeCode); dto.AccessIndicator = GetDtoNullSafe(accessIndicator); dto.CaseStatus = GetDtoNullSafe(caseStatus); dto.CaseStatusReason = GetDtoNullSafe(caseStatusReason); dto.LevelOfService = GetDtoNullSafe(levelOfService); dto.ReferralComments = referralComments; dto.Designation = GetDtoNullSafe(designation); dto.IsGoodCauseClaimed = GetDtoNullSafe(isGoodCauseClaimed); dto.GoodCauseClaimDate = goodCauseClaimDate;       One obvious problem is that this is tedious code.   It is error prone code.    Adding helper functions like GetDtoNullSafe help out immensely, but there is still an easier way. We can bypass the tedious code, by pass the complex inheritance tricks, and reduce all of this to a single method in the base class. TransferObject dto = new TransferObject(); CopyTo (this, dto); return dto; In the case of this one project, such a change eliminated the need for 20% of the total code base and a whole class of unit test cases that made sure that all of the properties were in synch. The impact of such a change also needs to include the on going time savings and the improvements in quality that can arise from them.    Developers who are not worried about keeping the properties in synch across mirrored object hierarchies are freed to worry about more important things like implementing business requirements.

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• Asp.net Session State Revisited

  - by karan@dotnet

  Every now and then I see doubts and queries which I believe is the most discussed topic in the .net environment - Asp.net Sessions. So what really are they, why are they needed and what does browser and .net do with it. These and some of the other questions I hope to answer with this post. Because of the stateless nature of the HTTP protocol there is always a need of state management in a web application. There are many other ways to store data but I feel Session state is amongst the most powerful one. The ASP.NET session state is a technology that lets you store server-side, user-specific data. Our web applications can then use data to process request from the user for which the session state was instantiated. So when does a session is first created? When we start a asp.net application a non-expiring cookie is created and its called as ASP.NET_SessionId. Basically there are two methods for this depending upon how you configure this setting in your config file. The session ID can be a part of cookie as discussed above(called as ASP.NET_SessionId) or it is embedded in the browser’s URL. For the latter part we have to set cookie-less session in our web.config file. These Session ID’s are 120-bit random number that is represented by 20-character string. The cookie will be alive until you close your browser. If you browse from one app to another within the same domain, then both the apps will use the same session ID to track the session state. Why reuse? so that you don’t have to create a new session ID for each request. One can abandon one particular Session by calling Session.Abandon() which will stop the page processing and clear out the session data. A subsequent page request causes a brand new session object to be instantiated. So what happened to my cookie? Well the session cookie is still there even when one Session.Abandon() is called and another session object is created. The Session.Abandon() lets you clear out your session state without waiting for session timeout. By default, this time-out is a 20-minute sliding expiration. This expiration is refreshed every time that the user makes a request to the Web site and presents the session ID cookie. The Abandon method sets a flag in the session state object that indicates that the session state should be abandoned. If your app does not have global.asax then your session cookie will be killed at the end of each page request. So you need to have a global.asax file and Session_Start() handler to make sure that the session cookie will remain intact once its issued after the first page hit. The runtime invokes global.asax’s Session_OnEnd() when you call Session.Abandon() or the session times out. The session manager stores session data in HttpCache with sliding expiration where this timeout can be configured in the <sessionState> of web.config file. When the timeout is up the HttpCache will remove the session state object. Sometimes we want particular pages not to time out as compared to other pages in our applications. We can handle this in two ways. First, we can set a timer or may be a JavaScript function that refreshes the page after fixed intervals of time. The only thing being the page being cached locally and then the request is not made to the server so to prevent that you can add this to your page: <%@ OutputCache Location="None" VaryByParam="None" %> Second approach is to move your page into its own folder and then add a web.config to that folder to control the timeout. Also not all pages in your application will need access to session state. For those pages that do not, you can indicate that session state is not needed and prevent session data from being fetched from the store in requests to these pages. You can disable the session state at page level like this:<%@ Page EnableSessionState="False" %>tbc…

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• Brainless Backups

  - by Jesse

  I’m a software developer by trade which means to my friends and family I’m just a “computer guy”. It’s assumed that I know everything about every facet of computing from removing spyware to replacing hardware. I also can do all of this blindly over the phone or after hearing a five to ten word description of the problem over dinner ;-) In my position as CIO of my friends and families I’ve been in the unfortunate position of trying to recover music, pictures, or documents off of failed hard drives on more than one occasion. It’s not a great situation for anyone, and it’s always at these times that the importance of backups becomes so clear. Several months back a friend of mine found himself in this situation. The hard drive on his 8 year old laptop failed and took a good number of his digital photos with it. I think most folks can deal with losing some of their music and even some of their documents, but it really stings to lose pictures of past events and loved ones. After ordering a new laptop, my friend went out and bought an external hard drive so that he could start keeping a backup of his data. As fate would have it, several months later the drive in his new laptop failed and he learned the hard way that simply buying the external hard drive isn’t enough… you actually have to copy your stuff over every once in awhile! The importance of backup and recovery plans is (hopefully) well known in IT organizations. Well executed backup plans are in place, and hopefully the backup and recovery process is tested regularly. When you’re talking about users at home, however, the need for these backups is often understood far too late. Most typical users can’t be expected to remember to backup their data regularly and also don’t always have the know-how to setup automated backups. For my friends and family members in this situation I recommend tools like Dropbox, Carbonite, and Mozy. Here’s why I like them: They’re affordable: Dropbox and Mozy both have free offerings, though most people with lots of music and/or photos to backup will probably exceed the storage limitations of those free plans pretty quickly. Still, all three offer pretty affordable monthly or yearly plans. In my opinion, Carbonite’s unlimited storage plan for $50-$60 per year is the best value around. They’re easy to setup: Both Dropbox and Carbonite are very easy to get setup and start using. I’ve never used Mozy, but I imagine it’s similarly painless to get up and running. Backups are automatically “off-site”: A backup that is sitting on an external hard drive right next to your computer is great, but might not protect against flood damage, a power surge, or other disasters in that single location. These services exist “in the cloud” so to speak, helping mitigate those concerns. Granted, this kind of backup scheme requires some trust in the 3rd party to protect your data from both malicious people and disastrous events. This truly is a bit of a double edged sword, but I sleep well at night knowing that my data is being backed up and secured by a company made up of engineers that focus on the business of doing backups right. Backups are “brainless”: What I like most about services like these is that they work “automagically” in the background, watching for files to be updated and automatically backing up those changes. There’s no need to remember to plug in that external drive and copy your data over. Since starting to recommend these services to my friends and family I find myself wearing my “data recovery” hat far less often. The only way backups are effective for your standard computer user is if they’re completely automatic. Backups need to be brainless, or they just won’t work.

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• CSV Anyone?

  - by Tim Dexter

  CSV, a dead format? With today's abilities to generate Excel output (Im working on some posts for the shiny new Excel templates) and the sophistication of the eText outputs, do you really need CSV? I guess so seeing as it was added after the base product was released as an enhancement. But I'd be interested in hearing use cases? I used to think the same of text output. But now Im working in the public sector where older technologies abound I can see a use for text output. Its also used as a machine readable format, etc. BIP still does not support a text format from its RTF templates but its very doable using XSL templates. Back to CSV, I noticed an enhancement in the big list of new stuff in the 10.1.3.4.1 rollup. You can now generate CSV from structured data ie a data template or a SQL XML query. This piqued my interest so I ran off a data template to CSV. Its interesting, in a geeky kinda way, I guess Im that way inclined.Here's my data structure:<EMPLOYEES> <LIST_G_DEPT> <G_DEPT>  <DEPARTMENT_ID>10</DEPARTMENT_ID>  <DEPARTMENT_NAME>Administration</DEPARTMENT_NAME>  <LIST_G_EMP>   <G_EMP>     <EMPLOYEE_ID>200</EMPLOYEE_ID>     <EMP_NAME>Jennifer Whalen</EMP_NAME>     <EMAIL>JWHALEN</EMAIL>     <PHONE_NUMBER>515.123.4444</PHONE_NUMBER>     <HIRE_DATE>1987-09-17T00:00:00.000-06:00</HIRE_DATE>     <SALARY>4400</SALARY>    </G_EMP>   </LIST_G_EMP>  <TOTAL_EMPS>1</TOTAL_EMPS>  <TOTAL_SALARY>4400</TOTAL_SALARY>  <AVG_SALARY>4400</AVG_SALARY>  <MAX_SALARY>4400</MAX_SALARY>  <MIN_SALARY>4400</MIN_SALARY> </G_DEPT>Poor ol Jennifer, she needs some help in the Admin department :0)Pushing this to CSV and BP completely flattens the data out so you get a completely denormalized data output in the CSV.TOTAL_SALARY,DEPARTMENT_ID,DEPARTMENT_NAME,MIN_SALARY,AVG_SALARY,MAX_SALARY,EMPLOYEE_ID,SALARY,PHONE_NUMBER,HIRE_DATE,EMP_NAME,EMAIL,TOTAL_EMPS4400,10,Administration,4400,4400,4400,200,4400,515.123.4444,1987-09-17T00:00:00.000-06:00,"Jennifer Whalen",JWHALEN,119000,20,Marketing,6000,9500,13000,201,13000,515.123.5555,1996-02-17T00:00:00.000-07:00,"Michael Hartstein",MHARTSTE,219000,20,Marketing,6000,9500,13000,202,6000,603.123.6666,1997-08-17T00:00:00.000-06:00,"Pat Fay",PFAY,2Useful? Its a little confusing to start with but it is completely de-normalized so there is lots of repetition. But if it floats your boat, you got it!

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• Microsoft Silverlight 4 Business Application Development: Beginner's Guide

  Build enterprise-ready business applications with Silverlight An introduction to building enterprise-ready business applications with Silverlight quickly. Get hold of the basic tools and skills needed to get started in Silverlight application development. Integrate different media types, taking the RIA experience further with Silverlight, and much more! Rapidly manage business focused controls, data, and business logic connectivity. A suite of business applications will be built over the course of the book and all examples will be geared around real-world useful application developments, enabling .NET developers to focus on getting started in business application development using Silverlight. In Detail Microsoft Silverlight is a programmable web browser plug-in that enables features including animation, vector graphics, and audio-video playback--features that characterize Rich Internet Applications. Silverlight makes possible the development of RIA applications in familiar .NET languages such as C# and VB.NET. Silverlight is a great (and growing) Line of Business platform and is increasingly being used to build business applications. Silverlight 3 made a big step in LOB; Silverlight 4 builds upon this further. This book will enable .NET developers to feel the pulse of business application development with Silverlight quickly. This book is not a general Silverlight 3/4 overview book. It is uniquely aimed at developers who require an introduction to building business applications with Silverlight. This book will focus on building a suite of real-world, useful business applications in a practical hands-on approach. This book is for .Net developers, providing the answers to many questions that are encountered when creating business applications in Silverlight, ultimately enabling rapid development with ease! This book teaches you how to build business applications with Silverlight 3 and 4. Building a suite of applications, it begins by introducing you to the basic tools and skills needed to get started in Silverlight development. It then dives deeply into the world of business application development, covering all the required concepts needed to build sophisticated business applications and provide a rich user experience. Chapters include: building a public website, adding rich media to the website, incorporating RIA into your website, and among others. By following the practical steps in this book, you will learn what's needed to create rich business applications--from the creation of a Silverlight application, to enhancing your application with rich media and connecting your Silverlight application to various Data Sources. What you will learn from this book Learn the basic tools and skills needed to get started in Silverlight 4 business application development. Discover how to enhance your Silverlight business applications with rich data such as sound and video. Know when and how to customize your data in Silverlight using important data controls. Understand how your Silverlight business applications can connect to various Data Sources. Deliver your Silverlight business application in a variety of forms.   Interesting? Read the chapter 1 Getting Started for free!! Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• Merge sort versus quick sort performance

  - by Giorgio

  I have implemented merge sort and quick sort using C (GCC 4.4.3 on Ubuntu 10.04 running on a 4 GB RAM laptop with an Intel DUO CPU at 2GHz) and I wanted to compare the performance of the two algorithms. The prototypes of the sorting functions are: void merge_sort(const char **lines, int start, int end); void quick_sort(const char **lines, int start, int end); i.e. both take an array of pointers to strings and sort the elements with index i : start <= i <= end. I have produced some files containing random strings with length on average 4.5 characters. The test files range from 100 lines to 10000000 lines. I was a bit surprised by the results because, even though I know that merge sort has complexity O(n log(n)) while quick sort is O(n^2), I have often read that on average quick sort should be as fast as merge sort. However, my results are the following. Up to 10000 strings, both algorithms perform equally well. For 10000 strings, both require about 0.007 seconds. For 100000 strings, merge sort is slightly faster with 0.095 s against 0.121 s. For 1000000 strings merge sort takes 1.287 s against 5.233 s of quick sort. For 5000000 strings merge sort takes 7.582 s against 118.240 s of quick sort. For 10000000 strings merge sort takes 16.305 s against 1202.918 s of quick sort. So my question is: are my results as expected, meaning that quick sort is comparable in speed to merge sort for small inputs but, as the size of the input data grows, the fact that its complexity is quadratic will become evident? Here is a sketch of what I did. In the merge sort implementation, the partitioning consists in calling merge sort recursively, i.e. merge_sort(lines, start, (start + end) / 2); merge_sort(lines, 1 + (start + end) / 2, end); Merging of the two sorted sub-array is performed by reading the data from the array lines and writing it to a global temporary array of pointers (this global array is allocate only once). After each merge the pointers are copied back to the original array. So the strings are stored once but I need twice as much memory for the pointers. For quick sort, the partition function chooses the last element of the array to sort as the pivot and scans the previous elements in one loop. After it has produced a partition of the type start ... {elements <= pivot} ... pivotIndex ... {elements > pivot} ... end it calls itself recursively: quick_sort(lines, start, pivotIndex - 1); quick_sort(lines, pivotIndex + 1, end); Note that this quick sort implementation sorts the array in-place and does not require additional memory, therefore it is more memory efficient than the merge sort implementation. So my question is: is there a better way to implement quick sort that is worthwhile trying out? If I improve the quick sort implementation and perform more tests on different data sets (computing the average of the running times on different data sets) can I expect a better performance of quick sort wrt merge sort? EDIT Thank you for your answers. My implementation is in-place and is based on the pseudo-code I have found on wikipedia in Section In-place version: function partition(array, 'left', 'right', 'pivotIndex') where I choose the last element in the range to be sorted as a pivot, i.e. pivotIndex := right. I have checked the code over and over again and it seems correct to me. In order to rule out the case that I am using the wrong implementation I have uploaded the source code on github (in case you would like to take a look at it). Your answers seem to suggest that I am using the wrong test data. I will look into it and try out different test data sets. I will report as soon as I have some results.

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