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  • How to fix Solr - Server is shutting down issue?

    - by Krunal
    I was having a running Solr 4.1 on Windows Server 2008 R2. The Solr is deployed on Tomcat. However, today it stops suddenly, and while accessing Solr it gives following error. HTTP Status 503 - Server is shutting down type Status report message Server is shutting down description The requested service is not currently available. On further looking into Logs, we got following: Log File: tomcat7-stderr.2013-05-09.txt May 09, 2013 8:00:40 PM org.apache.solr.core.CoreContainer finalize SEVERE: CoreContainer was not shutdown prior to finalize(), indicates a bug -- POSSIBLE RESOURCE LEAK!!! instance=2221663 Log File: catalina.2013-05-09.txt May 09, 2013 7:59:25 PM org.apache.solr.core.SolrResourceLoader <init> INFO: new SolrResourceLoader for directory: 'c:\solrdir\' May 09, 2013 7:59:29 PM org.apache.solr.common.SolrException log SEVERE: Exception during parsing file: null:org.xml.sax.SAXParseException; systemId: file:/c:/solr/solr.xml; lineNumber: 2; columnNumber: 6; The processing instruction target matching "[xX][mM][lL]" is not allowed. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source) at org.apache.solr.core.Config.<init>(Config.java:121) at org.apache.solr.core.CoreContainer.load(CoreContainer.java:428) at org.apache.solr.core.CoreContainer.load(CoreContainer.java:404) at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:336) at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:98) at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4656) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5309) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:977) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1655) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) May 09, 2013 7:59:29 PM org.apache.solr.servlet.SolrDispatchFilter init SEVERE: Could not start Solr. Check solr/home property and the logs May 09, 2013 7:59:29 PM org.apache.solr.common.SolrException log SEVERE: null:org.apache.solr.common.SolrException: at org.apache.solr.core.CoreContainer.load(CoreContainer.java:431) at org.apache.solr.core.CoreContainer.load(CoreContainer.java:404) at org.apache.solr.core.CoreContainer$Initializer.initialize(CoreContainer.java:336) at org.apache.solr.servlet.SolrDispatchFilter.init(SolrDispatchFilter.java:98) at org.apache.catalina.core.ApplicationFilterConfig.initFilter(ApplicationFilterConfig.java:281) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:262) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:107) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4656) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5309) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:633) at org.apache.catalina.startup.HostConfig.deployWAR(HostConfig.java:977) at org.apache.catalina.startup.HostConfig$DeployWar.run(HostConfig.java:1655) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: org.xml.sax.SAXParseException; systemId: file:/c:/solrdir/solr.xml; lineNumber: 2; columnNumber: 6; The processing instruction target matching "[xX][mM][lL]" is not allowed. at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source) at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPIData(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanPIData(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLScanner.scanPI(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source) at org.apache.solr.core.Config.<init>(Config.java:121) at org.apache.solr.core.CoreContainer.load(CoreContainer.java:428) ... 20 more May 09, 2013 7:59:29 PM org.apache.solr.servlet.SolrDispatchFilter init INFO: SolrDispatchFilter.init() done May 09, 2013 7:59:29 PM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\docs May 09, 2013 7:59:30 PM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\manager May 09, 2013 7:59:30 PM org.apache.catalina.startup.HostConfig deployDirectory INFO: Deploying web application directory C:\Program Files (x86)\Apache Software Foundation\Tomcat 7.0\webapps\ROOT May 09, 2013 7:59:30 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["http-bio-8983"] May 09, 2013 7:59:30 PM org.apache.coyote.AbstractProtocol start INFO: Starting ProtocolHandler ["ajp-bio-8009"] May 09, 2013 7:59:30 PM org.apache.catalina.startup.Catalina start INFO: Server startup in 9578 ms May 09, 2013 8:00:40 PM org.apache.solr.core.CoreContainer finalize SEVERE: CoreContainer was not shutdown prior to finalize(), indicates a bug -- POSSIBLE RESOURCE LEAK!!! instance=2221663 Any idea what could be wrong and how to fix?

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  • Java Logger API

    - by Koppar
    This is a more like a tip rather than technical write up and serves as a quick intro for newbies. The logger API helps to diagnose application level or JDK level issues at runtime. There are 7 levels which decide the detailing in logging (SEVERE, WARNING, INFO, CONFIG, FINE, FINER, FINEST). Its best to start with highest level and as we narrow down, use more detailed logging for a specific area. SEVERE is the highest and FINEST is the lowest. This may not make sense until we understand some jargon. The Logger class provides the ability to stream messages to an output stream in a format that can be controlled by the user. What this translates to is, I can create a logger with this simple invocation and use it add debug messages in my class: import java.util.logging.*; private static final Logger focusLog = Logger.getLogger("java.awt.focus.KeyboardFocusManager"); if (focusLog.isLoggable(Level.FINEST)) { focusLog.log(Level.FINEST, "Calling peer setCurrentFocusOwner}); LogManager acts like a book keeper and all the getLogger calls are forwarded to LogManager. The LogManager itself is a singleton class object which gets statically initialized on JVM start up. More on this later. If there is no existing logger with the given name, a new one is created. If there is one (and not yet GC’ed), then the existing Logger object is returned. By default, a root logger is created on JVM start up. All anonymous loggers are made as the children of the root logger. Named loggers have the hierarchy as per their name resolutions. Eg: java.awt.focus is the parent logger for java.awt.focus.KeyboardFocusManager etc. Before logging any message, the logger checks for the log level specified. If null is specified, the log level of the parent logger will be set. However, if the log level is off, no log messages would be written, irrespective of the parent’s log level. All the messages that are posted to the Logger are handled as a LogRecord object.i.e. FocusLog.log would create a new LogRecord object with the log level and message as its data members). The level of logging and thread number are also tracked. LogRecord is passed on to all the registered Handlers. Handler is basically a means to output the messages. The output may be redirected to either a log file or console or a network logging service. The Handler classes use the LogManager properties to set filters and formatters. During initialization or JVM start up, LogManager looks for logging.properties file in jre/lib and sets the properties if the file is provided. An alternate location for properties file can also be specified by setting java.util.logging.config.file system property. This can be set in Java Control Panel ? Java ? Runtime parameters as -Djava.util.logging.config.file = <mylogfile> or passed as a command line parameter java -Djava.util.logging.config.file = C:/Sunita/myLog The redirection of logging depends on what is specified rather registered as a handler with JVM in the properties file. java.util.logging.ConsoleHandler sends the output to system.err and java.util.logging.FileHandler sends the output to file. File name of the log file can also be specified. If you prefer XML format output, in the configuration file, set java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter and if you prefer simple text, set set java.util.logging.FileHandler.formatter =java.util.logging.SimpleFormatter Below is the default logging Configuration file: ############################################################ # Default Logging Configuration File # You can use a different file by specifying a filename # with the java.util.logging.config.file system property. # For example java -Djava.util.logging.config.file=myfile ############################################################ ############################################################ # Global properties ############################################################ # "handlers" specifies a comma separated list of log Handler # classes. These handlers will be installed during VM startup. # Note that these classes must be on the system classpath. # By default we only configure a ConsoleHandler, which will only # show messages at the INFO and above levels. handlers= java.util.logging.ConsoleHandler # To also add the FileHandler, use the following line instead. #handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandler # Default global logging level. # This specifies which kinds of events are logged across # all loggers. For any given facility this global level # can be overriden by a facility specific level # Note that the ConsoleHandler also has a separate level # setting to limit messages printed to the console. .level= INFO ############################################################ # Handler specific properties. # Describes specific configuration info for Handlers. ############################################################ # default file output is in user's home directory. java.util.logging.FileHandler.pattern = %h/java%u.log java.util.logging.FileHandler.limit = 50000 java.util.logging.FileHandler.count = 1 java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter # Limit the message that are printed on the console to INFO and above. java.util.logging.ConsoleHandler.level = INFO java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter ############################################################ # Facility specific properties. # Provides extra control for each logger. ############################################################ # For example, set the com.xyz.foo logger to only log SEVERE # messages: com.xyz.foo.level = SEVERE Since I primarily use this method to track focus issues, here is how I get detailed awt focus related logging. Just set the logger name to java.awt.focus.level=FINEST and change the default log level to FINEST. Below is a basic sample program. The sample programs are from http://www2.cs.uic.edu/~sloan/CLASSES/java/ and have been modified to illustrate the logging API. By changing the .level property in the logging.properties file, one can control the output written to the logs. To play around with the example, try changing the levels in the logging.properties file and notice the difference in messages going to the log file. Example --------KeyboardReader.java------------------------------------------------------------------------------------- import java.io.*; import java.util.*; import java.util.logging.*; public class KeyboardReader { private static final Logger mylog = Logger.getLogger("samples.input"); public static void main (String[] args) throws java.io.IOException { String s1; String s2; double num1, num2, product; // set up the buffered reader to read from the keyboard BufferedReader br = new BufferedReader (new InputStreamReader (System.in)); System.out.println ("Enter a line of input"); s1 = br.readLine(); if (mylog.isLoggable(Level.SEVERE)) { mylog.log (Level.SEVERE,"The line entered is " + s1); } if (mylog.isLoggable(Level.INFO)) { mylog.log (Level.INFO,"The line has " + s1.length() + " characters"); } if (mylog.isLoggable(Level.FINE)) { mylog.log (Level.FINE,"Breaking the line into tokens we get:"); } int numTokens = 0; StringTokenizer st = new StringTokenizer (s1); while (st.hasMoreTokens()) { s2 = st.nextToken(); numTokens++; if (mylog.isLoggable(Level.FINEST)) { mylog.log (Level.FINEST, " Token " + numTokens + " is: " + s2); } } } } ----------MyFileReader.java---------------------------------------------------------------------------------------- import java.io.*; import java.util.*; import java.util.logging.*; public class MyFileReader extends KeyboardReader { private static final Logger mylog = Logger.getLogger("samples.input.file"); public static void main (String[] args) throws java.io.IOException { String s1; String s2; // set up the buffered reader to read from the keyboard BufferedReader br = new BufferedReader (new FileReader ("MyFileReader.txt")); s1 = br.readLine(); if (mylog.isLoggable(Level.SEVERE)) { mylog.log (Level.SEVERE,"ATTN The line is " + s1); } if (mylog.isLoggable(Level.INFO)) { mylog.log (Level.INFO, "The line has " + s1.length() + " characters"); } if (mylog.isLoggable(Level.FINE)) { mylog.log (Level.FINE,"Breaking the line into tokens we get:"); } int numTokens = 0; StringTokenizer st = new StringTokenizer (s1); while (st.hasMoreTokens()) { s2 = st.nextToken(); numTokens++; if (mylog.isLoggable(Level.FINEST)) { mylog.log (Level.FINEST,"Breaking the line into tokens we get:"); mylog.log (Level.FINEST," Token " + numTokens + " is: " + s2); } } //end of while } // end of main } // end of class ----------MyFileReader.txt------------------------------------------------------------------------------------------ My first logging example -------logging.properties------------------------------------------------------------------------------------------- handlers= java.util.logging.ConsoleHandler, java.util.logging.FileHandler .level= FINEST java.util.logging.FileHandler.pattern = java%u.log java.util.logging.FileHandler.limit = 50000 java.util.logging.FileHandler.count = 1 java.util.logging.FileHandler.formatter = java.util.logging.SimpleFormatter java.util.logging.ConsoleHandler.level = FINEST java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter java.awt.focus.level=ALL ------Output log------------------------------------------------------------------------------------------- May 21, 2012 11:44:55 AM MyFileReader main SEVERE: ATTN The line is My first logging example May 21, 2012 11:44:55 AM MyFileReader main INFO: The line has 24 characters May 21, 2012 11:44:55 AM MyFileReader main FINE: Breaking the line into tokens we get: May 21, 2012 11:44:55 AM MyFileReader main FINEST: Breaking the line into tokens we get: May 21, 2012 11:44:55 AM MyFileReader main FINEST: Token 1 is: My May 21, 2012 11:44:55 AM MyFileReader main FINEST: Breaking the line into tokens we get: May 21, 2012 11:44:55 AM MyFileReader main FINEST: Token 2 is: first May 21, 2012 11:44:55 AM MyFileReader main FINEST: Breaking the line into tokens we get: May 21, 2012 11:44:55 AM MyFileReader main FINEST: Token 3 is: logging May 21, 2012 11:44:55 AM MyFileReader main FINEST: Breaking the line into tokens we get: May 21, 2012 11:44:55 AM MyFileReader main FINEST: Token 4 is: example Invocation command: "C:\Program Files (x86)\Java\jdk1.6.0_29\bin\java.exe" -Djava.util.logging.config.file=logging.properties MyFileReader References Further technical details are available here: http://docs.oracle.com/javase/1.4.2/docs/guide/util/logging/overview.html#1.0 http://docs.oracle.com/javase/1.4.2/docs/api/java/util/logging/package-summary.html http://www2.cs.uic.edu/~sloan/CLASSES/java/

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  • MySQL InnoDB Corruption after power outage, possible to recover?

    - by Tim Hackett
    Hey Guys, I recently started trying to get Redmine up and running after a power outage that seems to have corrupted our InnoDB database in MySQL. Redmine had an extensive set of documentation that I would like to get even if redmine isn't able to run. The service fails on startup. I have tried inserting innodb_force_recovery = 4 per the documentation from the url in the error log. (also tried 1 thru 6 as I have backed up all directories after the corruption) I have verified through "mysqld-nt --print-defaults" that it is starting with the recovery option in the params. The machine is running Windows Server 2003 SP2, Xeon E5335 with 2GB RAM, MySQL is not mirrored to another machine, nor is the machine a mirror. I do not have any backups because the previous person did not set them up. Here is the error log: InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 100308 14:50:01 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 100308 14:50:02 InnoDB: Error: page 7 log sequence number 0 935521175 InnoDB: is in the future! Current system log sequence number 0 933419020. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html InnoDB: for more information. 100308 14:50:02 InnoDB: Error: page 2 log sequence number 0 935517607 InnoDB: is in the future! Current system log sequence number 0 933419020. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html InnoDB: for more information. 100308 14:50:02 InnoDB: Error: page 11 log sequence number 0 935517607 InnoDB: is in the future! Current system log sequence number 0 933419020. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html InnoDB: for more information. 100308 14:50:02 InnoDB: Error: page 5 log sequence number 0 972973045 InnoDB: is in the future! Current system log sequence number 0 933419020. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html InnoDB: for more information. 100308 14:50:02 InnoDB: Error: page 6 log sequence number 0 972984051 InnoDB: is in the future! Current system log sequence number 0 933419020. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html InnoDB: for more information. 100308 14:50:02 InnoDB: Error: page 1577 log sequence number 0 972737368 InnoDB: is in the future! Current system log sequence number 0 933419020. InnoDB: Your database may be corrupt or you may have copied the InnoDB InnoDB: tablespace but not the InnoDB log files. See InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html InnoDB: for more information. InnoDB: Error: trying to access page number 4294965119 in space 0, InnoDB: space name .\ibdata1, InnoDB: which is outside the tablespace bounds. InnoDB: Byte offset 0, len 16384, i/o type 10. InnoDB: If you get this error at mysqld startup, please check that InnoDB: your my.cnf matches the ibdata files that you have in the InnoDB: MySQL server. 100308 14:50:02InnoDB: Assertion failure in thread 960 in file .\fil\fil0fil.c line 3959 InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.0/en/forcing-recovery.html InnoDB: about forcing recovery. 100308 14:50:02 [ERROR] mysqld-nt: Got signal 11. Aborting! 100308 14:50:02 [ERROR] Aborting 100308 14:50:02 [Note] mysqld-nt: Shutdown complete

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  • HTG Explains: Why is Printer Ink So Expensive?

    - by Chris Hoffman
    Printer ink is expensive, more expensive per drop than fine champagne or even human blood. If you haven’t gone paperless, you’ll notice that you’re paying a lot for new ink cartridges — more than seems reasonable. Purchasing the cheapest inkjet printer and buying official ink cartridge replacements is the most expensive thing you can do. There are ways to save money on ink if you must continue to print documents. Cheap Printers, Expensive Ink Ink jet printers are often very cheap. That’s because they’re sold at cost, or even at a loss — the manufacturer either makes no profit from the printer itself or loses money. The manufacturer will make most of its money from the printer cartridges you buy later. Even if the company does make a bit of money from each printer sold, it makes a much larger profit margin on ink. Rather than selling you a printer that may be rather expensive, they want to sell you a cheap printer and make money on an ongoing basis by providing expensive printer ink. It’s been compared to the razor model — sell a razor cheaply and mark up the razor blades. Rather than making a one-time profit on the razor, you’ll make continuing profit as the customer keeps buying razor blade replacements — or ink, in this case. Many printer manufacturers go out of their way to make it difficult for you to use unofficial ink cartridges, building microchips into their official ink cartridges. If you use an unofficial cartridge or refill an official cartridge, the printer may refuse to use it. Lexmark once argued in court that unofficial microchips that enable third-party ink cartridges would violate their copyright and Lexmark has argued that creating an unofficial microchip to bypass this restriction on third-party ink would violate Lexmark’s copyright and be illegal under the US DMCA. Luckily, they lost this argument. What Printer Companies Say Printer companies have put forth their own arguments in the past, attempting to justify the high cost of official ink cartridges and microchips that block any competition. In a Computer World story from 2010, HP argued that they spend a billion dollars each year on “ink research and development.” They point out that printer ink “must be formulated to withstand heating to 300 degrees, vaporization, and being squirted at 30 miles per hour, at a rate of 36,000 drops per second, through a nozzle one third the size of a human hair. After all that it must dry almost instantly on the paper.” They also argue that printers have become more efficient and use less ink to print, while third-party cartridges are less reliable. Companies that use microchips in their ink cartridges argue that only the microchip has the ability to enforce an expiration date, preventing consumers from using old ink cartridges. There’s something to all these arguments, sure — but they don’t seem to justify the sky-high cost of printer ink or the restriction on using third-party or refilled cartridges. Saving Money on Printing Ultimately, the price of something is what people are willing to pay and printer companies have found that most consumers are willing to pay this much for ink cartridge replacements. Try not to fall for it: Don’t buy the cheapest inkjet printer. Consider your needs when buying a printer and do some research. You’ll save more money in the long run. Consider these basic tips to save money on printing: Buy Refilled Cartridges: Refilled cartridges from third parties are generally much cheaper. Printer companies warn us away from these, but they often work very well. Refill Your Own Cartridges: You can get do-it-yourself kits for refilling your own printer ink cartridges, but this can be messy. Your printer may refuse to accept a refilled cartridge if the cartridge contains a microchip. Switch to a Laser Printer: Laser printers use toner, not ink cartridges. If you print a lot of black and white documents, a laser printer can be cheaper. Buy XL Cartridges: If you are buying official printer ink cartridges, spend more money each time. The cheapest ink cartridges won’t contain much ink at all, while larger “XL” ink cartridges will contain much more ink for only a bit more money. It’s often cheaper to buy in bulk. Avoid Printers With Tri-Color Ink Cartridges: If you’re printing color documents, you’ll want to get a printer that uses separate ink cartridges for all its colors. For example, let’s say your printer has a “Color” cartridge that contains blue, green, and red ink. If you print a lot of blue documents and use up all your blue ink, the Color cartridge will refuse to function — now all you can do is throw away your cartridge and buy a new one, even if the green and red ink chambers are full. If you had a printer with separate color cartridges, you’d just have to replace the blue cartridge. If you’ll be buying official ink cartridges, be sure to compare the cost of cartridges when buying a printer. The cheapest printer may be more expensive in the long run. Of course, you’ll save the most money if you stop printing entirely and go paperless, keeping digital copies of your documents instead of paper ones. Image Credit: Cliva Darra on Flickr     

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  • How to Create AppArmor Profiles to Lock Down Programs on Ubuntu

    - by Chris Hoffman
    AppArmor locks down programs on your Ubuntu system, allowing them only the permissions they require in normal use – particularly useful for server software that may become compromised. AppArmor includes simple tools you can use to lock down other applications. AppArmor is included by default in Ubuntu and some other Linux distributions. Ubuntu ships AppArmor with several profiles, but you can also create your own AppArmor profiles. AppArmor’s utilities can monitor a program’s execution and help you create a profile. Before creating your own profile for an application, you may want to check the apparmor-profiles package in Ubuntu’s repositories to see if a profile for the application you want to confine already exists. How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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  • How to Recover an Encrypted Home Directory on Ubuntu

    - by Chris Hoffman
    Access an encrypted home directory when you’re not logged in – say, from a live CD – and all you’ll see is a README file. You’ll need a terminal command to recover your encrypted files. You should also back up your mount passphrase ahead of time – you may need this in the future. While eCryptfs normally decrypts your files with your login passphrase, the mount passphrase may be necessary if eCryptfs’s files become lost. HTG Explains: What Is RSS and How Can I Benefit From Using It? HTG Explains: Why You Only Have to Wipe a Disk Once to Erase It HTG Explains: Learn How Websites Are Tracking You Online

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  • Gnome Keyring keeps asking for a password that doesn't exist

    - by Chris Wilson
    When ever I long into Ubuntu, I'm immediately presented with a dialogue that asks me to enter the password that will unlock Gnome Keyring, however I was never prompted to set this in the first place, and none of the passwords I've tried are effective. How can I disable these popups and just have Gnome Keyring unlocked when I log in in the same way that encrypted home directories are automatically mounted upon log in. FWIW, I'm set to auto log in, which may or may not be useful information. Btw, I've seen this question, and the accepted answer didn't work. I'd rather not uninstall Keyring Update 1: I've disabled automatic login but it still appears.

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  • How to Comment Out and Uncomment Lines in a Configuration File

    - by Chris Hoffman
    You may have seen instructions that tell you to “uncomment” or “comment out” lines in a configuration or source code file. This is a simple process, but may not be self-explanatory to people that don’t understand the file’s structure. The interpreter ignores lines marked as comments, which are only to aid humans in understanding the file. Because of this, comments can be used to disable or enable configuration options in configuration files. How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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  • HTG Explains: How the SmartScreen Filter Works in Windows 8

    - by Chris Hoffman
    Windows 8 includes a SmartScreen filter that prevents unknown and malicious programs from running. SmartScreen is part of Internet Explorer 8 and 9 – with Windows 8, it’s now integrated into the operating system. SmartScreen is a useful security feature that will help prevent bad applications from running, but it may occasionally prevent a legitimate application from running. SmartScreen reports some information to Microsoft, so it may have some privacy implications. HTG Explains: Is ReadyBoost Worth Using? HTG Explains: What The Windows Event Viewer Is and How You Can Use It HTG Explains: How Windows Uses The Task Scheduler for System Tasks

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  • How To Convert Virtual Machines Between VirtualBox and VMware

    - by Chris Hoffman
    Migrating to another virtual machine program can be intimidating. if you already have your virtual machines set up they way you like them, you don’t necessarily have to install them from scratch – you can migrate your existing virtual machines. VirtualBox and VMware use different virtual machine formats, but each supports the standard Open Virtualization Format. Convert your existing virtual machine to OVF or OVA and you’ll be able to import it into another virtual machine program. Unfortunately, this may not always work perfectly, as VirtualBox and VMware both seem to use slightly different OVA/OVF implementations that aren’t entirely compatible. If this doesn’t work, you may want to reinstall your virtual machine’s guest operating system from scratch. 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • The Ultimate Nexus 7 Troubleshooting Guide: 6 Potential Problems and How to Fix Them

    - by Chris Hoffman
    Have you had any issues with your Nexus 7? We’ve run into quite a few problems and fixed them all – from bad performance and touch-screen responsiveness issues to tablets that won’t power on and separating screens. Some of these problems may not be common – or may be fixed with newer hardware or software updates — but they’re all problems we’ve run into. We’ve collected the solutions here so you don’t have to dig through forum posts. Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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  • How To Enable Do Not Track In Every Web Browser

    - by Chris Hoffman
    We’ve covered why “Do Not Track” isn’t a silver bullet that prevents you from being tracked. However, if you don’t like being tracked and want to express that preference to websites, you can enable “Do Not Track” in every browser. To Google’s credit, future versions of Chrome explain exactly what Do Not Track does when you enable it. Remember that, by enabling Do Not Track, you’re just expressing a preference. Websites may or may not obey your preference. Why Enabling “Do Not Track” Doesn’t Stop You From Being Tracked HTG Explains: What is the Windows Page File and Should You Disable It? How To Get a Better Wireless Signal and Reduce Wireless Network Interference

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  • Can't install libapache2-mod-php5

    - by chris
    When I try to install libapache2-mod-php5, I get an error: Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help resolve the situation: The following packages have unmet dependencies: libapache2-mod-php5 : Depends: apache2-mpm-prefork (> 2.0.52) but it is not going to be installed or apache2-mpm-itk but it is not going to be installed E: Unable to correct problems, you have held broken packages. I have tried apt-get clean, update and upgrade, as well as -f install, and no change. Is there a way to fix this, or is there an easy way to manually install the php plugin?

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  • Needs management tool for .java files

    - by Chris Okyen
    When I open the src file in the project folder in Package Explorer in Eclipse, it says the following: Error retrieving content description for resource '/GuiAdd/src/GuiAdd.Java.' Now, the directories of the source projects shown in Eclipse Package explorer doesn't always have the source file to link to, causing this message. I need a way to sync the folders in the correct directory without overwriting the newest ones. Some source files I project files of the root which the Package explorer links to may be the correct versions but other source files in the root may not have the latest source or any source. I am not using svn/git or other depository programs.

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  • Why are my Windows 7 updates continuously failing?

    - by Chris C.
    I'm an advanced level user here with an odd issue. I have two Windows Updates that are failing to install, every single time. I'm getting a mysterious "Code 1" error on both updates, an error for which I'm having difficulty finding a solution. The updates in question are: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Because these updates are failing, the Shut Down button in my start menu always has the shield icon next to it, indicating that "new" updates will be installed on shut down. But, of course, they'll fail and when the PC is restarted, the shield icon is still there. When checking the update history and viewing the details of the failed updates, I get the following: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) Installation date: ?6/?29/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important A security issue has been identified leading to MFC application vulnerability in DLL planting due to MFC not specifying the full path to system/localization DLLs. You can protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer. More information: http://go.microsoft.com/fwlink/?LinkId=216803 System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Installation date: ?6/?28/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important This tool is being offered because an inconsistency was found in the Windows servicing store which may prevent the successful installation of future updates, service packs, and software. This tool checks your computer for such inconsistencies and tries to resolve issues if found. More information: http://support.microsoft.com/kb/947821 About My System I'm running Windows 7 Home Premium x64 Edition. This is a custom PC build and the OS was installed fresh, not an upgrade from a previous version. I've been running this system for about 4 months. Windows Updates aside, the system is usually quite stable. Thanks in advance for your help!

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  • Solr error; JNDI not configured for solr; Anybody know what this means?

    - by Camran
    I am installing solr on my VPS (Ubuntu 9.10) via PuTTY. First, I thought about installing Solr with Tomcat, but then after installing tomcat, I changed my mind and went for the Jetty which comes with Solr. Now that I have setup everything on my Server, and try to start the "start.jar" file, I get some errors... Here is some text from the log file: 2010-05-29 00:22:42.074::INFO: jetty-6.1.3 2010-05-29 00:22:42.134::INFO: Extract jar:file:/var/www/webapps/solr.war!/ to /var/www/work/Jetty_0_0_0_0_8983_solr.war__solr__k1kf17/webapp May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: JNDI not configured for solr (NoInitialContextEx) May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: solr home defaulted to 'solr/' (could not find system property or JNDI) May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader <init> INFO: Solr home set to 'solr/' May 29, 2010 12:22:42 AM org.apache.solr.servlet.SolrDispatchFilter init INFO: SolrDispatchFilter.init() May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: JNDI not configured for solr (NoInitialContextEx) May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader locateSolrHome INFO: solr home defaulted to 'solr/' (could not find system property or JNDI) May 29, 2010 12:22:42 AM org.apache.solr.core.CoreContainer$Initializer initialize INFO: looking for solr.xml: /var/www/solr/solr.xml May 29, 2010 12:22:42 AM org.apache.solr.core.SolrResourceLoader <init> INFO: Solr home set to 'solr/' Anybody know what this is? Thanks

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  • Squirrelmail receiving duplicate emails

    - by Austin
    A client of mine is experiencing issues with his email, it appears that whenever he receives email from a certain domain it comes as duplicates. Not only are they duplicates but the duplicated items have a (+) sign next to them which usually indicates an attachment. Could this be because of a forwarding issue? Here are the headers: Return-Path: <[email protected]> Received: from bigcat.centralmasswebdesign.com (root@localhost) by tarbellconstruction.com (8.13.1/8.13.1) with ESMTP id o4OFnO23003379 for <[email protected]>; Mon, 24 May 2010 11:49:24 -0400 X-ClientAddr: 72.249.26.200 Received: from mf3.spamfiltering.com (mf3.spamfiltering.com [72.249.26.200]) by bigcat.centralmasswebdesign.com (8.13.1/8.13.1) with ESMTP id o4OFnOjF005520 for <[email protected]>; Mon, 24 May 2010 11:49:24 -0400 X-Envelope-From: [email protected] X-Envelope-To: [email protected] Received: From 67-132-16-226.dia.static.qwest.net (67.132.16.226) by mf3.spamfiltering.com (MAILFOUNDRY) id 6lzIAmdLEd+oFQAw for [email protected]; Mon, 24 May 2010 15:49:23 -0000 (GMT) Received: from mail pickup service by WMA2-EXCH1.NELCO-USA.net with Microsoft SMTPSVC; Mon, 24 May 2010 11:49:18 -0400 Content-Transfer-Encoding: 7bit Importance: normal Priority: normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.3790.4325 Content-Class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CAFB58.AAB268D0" Subject: weekly activity report for week ending May 22, 2010 Date: Mon, 24 May 2010 11:49:16 -0400 Message-ID: <15BCC4D99E8CBF48A2FA37A318CFF5C801209CCC@wma2-exch1.NELCO-USA.net> X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: weekly activity report for week ending May 22, 2010 thread-index: Acr7WKpdCelRCiocT1eBY2YN5Ma8DA== From: "Mike LeBlanc" <[email protected]> To: "Keith Berube" <[email protected]>, "Ken Tarbell" <[email protected]> X-OriginalArrivalTime: 24 May 2010 15:49:18.0361 (UTC) FILETIME=[AB546890:01CAFB58]

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  • Apache (Solaris 10): 2 symlinks to the same file, one works the other doesn't

    - by justcatchingrye
    I'm seeing a strange issue with Apache I have a system that pulls a configuration file from a web server. I want to use a symlink with the name 'ocds-dpsarch01a.rules'. This doesn't work. However, if I change one character in that name and link it to the same file, it works - See below I can't think of any reason why one symlink would work when another doesn't? I would have thought either the Apache configuration is right and all symlinks work, or it isn't and no syslinks work(?) Any thoughts welcome ls -l /REMOVED/apache2/htdocs/rules/syslog/*cds-dpsarch01a.rules lrwxrwxrwx 1 root root 62 May 13 13:55 ocds-dpsarch01a.rules - /REMOVED/apache2/htdocs/templates/syslog/DCM_SST_DPST_01.rules lrwxrwxrwx 1 root root 62 May 13 13:52 xcds-dpsarch01a.rules - /REMOVED/apache2/htdocs/templates/syslog/DCM_SST_DPST_01.rules 1) Application starting and successfully reading configuration from the web server 13/05/2010 13:56:37: Information: Connecting ... 13/05/2010 13:56:37: Debug: Reading REMOVED:// REMOVED /rules/syslog/xcds-dpsarch01a.rules 13/05/2010 13:56:37: Debug: HTTP response: HTTP/1.1 200 OK Date: Thu, 13 May 2010 13:56:34 GMT Server: Apache Last-Modified: Fri, 09 Apr 2010 12:28:26 GMT ETag: "5073-a744-ee92ae80" Accept-Ranges: bytes Content-Length: 42820 Cache-Control: max-age=5 Expires: Thu, 13 May 2010 13:56:39 GMT NL7C-Filtered: Content-Type: text/plain Connection: close 13/05/2010 13:56:37: Debug: Plain text rules file detected. 2) Application starting and failing to read configuration from the web server 13/05/2010 13:56:55: Information: Connecting ... 13/05/2010 13:56:55: Debug: Reading REMOVED :// REMOVED /rules/syslog/ocds-dpsarch01a.rules 13/05/2010 13:56:55: Debug: HTTP response: HTTP/1.1 403 Forbidden Date: Wed, 12 May 2010 15:25:11 GMT Server: Apache Vary: accept-language,accept-charset Accept-Ranges: bytes Connection: close Content-Type: text/html; charset=iso-8859-1 Content-Language: en Expires: Wed, 12 May 2010 15:25:11 GMT 13/05/2010 13:56:55: Error: HTTP: HTTP/1.1 403 Forbidden Date: Wed, 12 May 2010 15:25:11 GMT Server: Apache Vary: accept-language,accept-charset Accept-Ranges: bytes Connection: close Content-Type: text/html; charset=iso-8859-1 Content-Language: en Expires: Wed, 12 May 2010 15:25:11 GMT 13/05/2010 13:56:55: Error: HTTP GET failed 13/05/2010 13:56:55: Error: Failed to open Rules file: REMOVED :// REMOVED /rules/syslog/ocds-dpsarch01a.rules

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  • Why are my Windows 7 updates continuously failing?

    - by Chris C.
    I'm an advanced level user here with an odd issue. I have two Windows Updates that are failing to install, every single time. I'm getting a mysterious "Code 1" error on both updates, an error for which I'm having difficulty finding a solution. The updates in question are: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Because these updates are failing, the Shut Down button in my start menu always has the shield icon next to it, indicating that "new" updates will be installed on shut down. But, of course, they'll fail and when the PC is restarted, the shield icon is still there. When checking the update history and viewing the details of the failed updates, I get the following: Security Update for Microsoft Visual C++ 2008 Service Pack 1 Redistributable Package (KB2538243) Installation date: ?6/?29/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important A security issue has been identified leading to MFC application vulnerability in DLL planting due to MFC not specifying the full path to system/localization DLLs. You can protect your computer by installing this update from Microsoft. After you install this item, you may have to restart your computer. More information: http://go.microsoft.com/fwlink/?LinkId=216803 and: System Update Readiness Tool for Windows 7 for x64-based Systems (KB947821) [May 2011] Installation date: ?6/?28/?2011 3:00 AM Installation status: Failed Error details: Code 1 Update type: Important This tool is being offered because an inconsistency was found in the Windows servicing store which may prevent the successful installation of future updates, service packs, and software. This tool checks your computer for such inconsistencies and tries to resolve issues if found. More information: http://support.microsoft.com/kb/947821 About My System I'm running Windows 7 Home Premium 64-bit. This is a custom PC build and the OS was installed fresh, not an upgrade from a previous version. I've been running this system for about four months. Windows Updates aside, the system is usually quite stable.

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  • OpenVPN server will not redirect traffic

    - by skerit
    I set up an OpenVPN server on my VPS, using this guide: http://vpsnoc.com/blog/how-to-install-openvpn-on-a-debianubuntu-vps-instantly/ And I can connect to it without problems. Connect, that is, because no traffic is being redirected. When I try to load a webpage when connected to the vpn I just get an error. This is the config file it generated: dev tun server 10.8.0.0 255.255.255.0 ifconfig-pool-persist ipp.txt ca ca.crt cert server.crt key server.key dh dh1024.pem push "route 10.8.0.0 255.255.255.0" push "redirect-gateway" comp-lzo keepalive 10 60 ping-timer-rem persist-tun persist-key group daemon daemon This is my iptables.conf # Generated by iptables-save v1.4.4 on Sat May 7 13:09:44 2011 *raw :PREROUTING ACCEPT [37938267:10998335127] :OUTPUT ACCEPT [35616847:14165347907] COMMIT # Completed on Sat May 7 13:09:44 2011 # Generated by iptables-save v1.4.4 on Sat May 7 13:09:44 2011 *nat :PREROUTING ACCEPT [794948:91051460] :POSTROUTING ACCEPT [1603974:108147033] :OUTPUT ACCEPT [1603974:108147033] -A POSTROUTING -s 10.8.0.0/24 -o eth0 -j MASQUERADE -A POSTROUTING -s 10.8.0.0/24 -o eth1 -j MASQUERADE -A POSTROUTING -s 10.8.0.0/24 -o venet0 -j MASQUERADE COMMIT # Completed on Sat May 7 13:09:44 2011 # Generated by iptables-save v1.4.4 on Sat May 7 13:09:44 2011 *mangle :PREROUTING ACCEPT [37938267:10998335127] :INPUT ACCEPT [37677226:10960834925] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [35616847:14165347907] :POSTROUTING ACCEPT [35680187:14169930490] COMMIT # Completed on Sat May 7 13:09:44 2011 # Generated by iptables-save v1.4.4 on Sat May 7 13:09:44 2011 *filter :INPUT ACCEPT [37677226:10960834925] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [35616848:14165347947] -A INPUT -i eth0 -j LOG --log-prefix "BANDWIDTH_IN:" --log-level 7 -A FORWARD -o eth0 -j LOG --log-prefix "BANDWIDTH_OUT:" --log-level 7 -A FORWARD -i eth0 -j LOG --log-prefix "BANDWIDTH_IN:" --log-level 7 -A OUTPUT -o eth0 -j LOG --log-prefix "BANDWIDTH_OUT:" --log-level 7 COMMIT # Completed on Sat May 7 13:09:44 2011

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  • More SQL Smells

    - by Nick Harrison
    Let's continue exploring some of the SQL Smells from Phil's list. He has been putting together. Datatype mis-matches in predicates that rely on implicit conversion.(Plamen Ratchev) This is a great example poking holes in the whole theory of "If it works it's not broken" Queries will this probably will generally work and give the correct response. In fact, without careful analysis, you probably may be completely oblivious that there is even a problem. This subtle little problem will needlessly complicate queries and slow them down regardless of the indexes applied. Consider this example: CREATE TABLE [dbo].[Page](     [PageId] [int] IDENTITY(1,1) NOT NULL,     [Title] [varchar](75) NOT NULL,     [Sequence] [int] NOT NULL,     [ThemeId] [int] NOT NULL,     [CustomCss] [text] NOT NULL,     [CustomScript] [text] NOT NULL,     [PageGroupId] [int] NOT NULL;  CREATE PROCEDURE PageSelectBySequence ( @sequenceMin smallint , @sequenceMax smallint ) AS BEGIN SELECT [PageId] , [Title] , [Sequence] , [ThemeId] , [CustomCss] , [CustomScript] , [PageGroupId] FROM [CMS].[dbo].[Page] WHERE Sequence BETWEEN @sequenceMin AND @SequenceMax END  Note that the Sequence column is defined as int while the sequence parameter is defined as a small int. The problem is that the database may have to do a lot of type conversions to evaluate the query. In some cases, this may even negate the indexes that you have in place. Using Correlated subqueries instead of a join   (Dave_Levy/ Plamen Ratchev) There are two main problems here. The first is a little subjective, since this is a non-standard way of expressing the query, it is harder to understand. The other problem is much more objective and potentially problematic. You are taking much of the control away from the optimizer. Written properly, such a query may well out perform a corresponding query written with traditional joins. More likely than not, performance will degrade. Whenever you assume that you know better than the optimizer, you will most likely be wrong. This is the fundmental problem with any hint. Consider a query like this:  SELECT Page.Title , Page.Sequence , Page.ThemeId , Page.CustomCss , Page.CustomScript , PageEffectParams.Name , PageEffectParams.Value , ( SELECT EffectName FROM dbo.Effect WHERE EffectId = dbo.PageEffects.EffectId ) AS EffectName FROM Page INNER JOIN PageEffect ON Page.PageId = PageEffects.PageId INNER JOIN PageEffectParam ON PageEffects.PageEffectId = PageEffectParams.PageEffectId  This can and should be written as:  SELECT Page.Title , Page.Sequence , Page.ThemeId , Page.CustomCss , Page.CustomScript , PageEffectParams.Name , PageEffectParams.Value , EffectName FROM Page INNER JOIN PageEffect ON Page.PageId = PageEffects.PageId INNER JOIN PageEffectParam ON PageEffects.PageEffectId = PageEffectParams.PageEffectId INNER JOIN dbo.Effect ON dbo.Effects.EffectId = dbo.PageEffects.EffectId  The correlated query may just as easily show up in the where clause. It's not a good idea in the select clause or the where clause. Few or No comments. This one is a bit more complicated and controversial. All comments are not created equal. Some comments are helpful and need to be included. Other comments are not necessary and may indicate a problem. I tend to follow the rule of thumb that comments that explain why are good. Comments that explain how are bad. Many people may be shocked to hear the idea of a bad comment, but hear me out. If a comment is needed to explain what is going on or how it works, the logic is too complex and needs to be simplified. Comments that explain why are good. Comments may explain why the sql is needed are good. Comments that explain where the sql is used are good. Comments that explain how tables are related should not be needed if the sql is well written. If they are needed, you need to consider reworking the sql or simplify your data model. Use of functions in a WHERE clause. (Anil Das) Calling a function in the where clause will often negate the indexing strategy. The function will be called for every record considered. This will often a force a full table scan on the tables affected. Calling a function will not guarantee that there is a full table scan, but there is a good chance that it will. If you find that you often need to write queries using a particular function, you may need to add a column to the table that has the function already applied.

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  • Unclaimed user group prizes, Live meeting on Monday, Next weeks UG, SQLRelay and more prizes

    - by Testas
      Hi Everyone Firstly I want to let you know that I finally found the LINQ book prize winners and the list of people at the bottom of this email are owed a LINQ book. This will be given out at next week’s UG meeting Live meeting with Carolyn Chau, Program Manager at Microsoft on Monday! It is very rare that we get the opportunity to have a Live meeting with a Program Manager in Redmond. Carolyn Chau will be presenting PowerView next Monday at 8pm. Live meeting details can be found on http://sqlserverfaq.com/events/388/Live-Meeting-on-SQL-Server-2012-PowerView-with-Carolyn-Chau-Principal-Program-Manager-in-the-Reporting-Services-in-association-with-SQLPASS-SQLServerFAQ-and-SQLBits.aspx Next week’s UG!! We welcome Mark Broadbent to Manchester next week where he will be presenting his session on SQL Server 2012 on Windows Core. We also hand out the unclaimed prizes. Register at http://sqlserverfaq.com/events/369/Thursday-night-meeting-at-BSS-with-Chris-TestaONeill-and-Mark-Broadbent.aspx Chris Webb is in Manchester!!! Chris Webb will be speaking at the Manchester SQL Server UG on 4th July. He will also be running his Real World Cube Design and Performance Tuning with Analysis Services between the 3rd – 5th July. If you want to attend then you can sign up at the link below http://www.technitrain.com/coursedetail.php?c=13&trackingcode=FAQ SQLRelay and a Special Prize and Jamie Thomson comes to Manchester!!!! SQLRelay takes place in Manchester on the 22nd. We have a special guest, after years of asking Jamie Thomson is coming to Manchester. The SSIS Junkie will be gracing us with his presence with a talk on SSIS 2012. Also we have a prize. Know a friend or colleague who would benefit from SQLRelay? Get them to register at www.sqlserverfaq.com and then register for the event http://sqlserverfaq.com/events/373/ALL-DAY-TUESDAY-EVENT-12-hours-of-SQL-Server-2012-at-the-SQLRelay-meeting-at-the-COOP-Manchester.aspx Then send an email to [email protected] with the subject of SQLFriend with the name of your friend. If you are both at the SQLRelay event on the day and your names are pulled out of the hat you will win a PASS 2011 DVD and your friend will win the “Best of PASS DVD 2011” worth  $1000 courtesy of SQLPASS. The draw will take place between 4.30pm – 5pm on the day. SQLBits feedback!!!!! Attended SQLBits? We really need to know your opinion. Please fill out the survey for the days you attended If you attended any of the days at SQLBits please can you all fill out the following survey http://www.sqlbits.com/SQLBitsX If you attended the Thursday Training day then please fill out the following survey: http://www.sqlbits.com/SQLBitsXThursday If you attended the Friday Deep Dives day then please fill out the following survey: http://www.sqlbits.com/SQLBitsXFriday If you attended the Saturday Community day then please fill out the following survey: http://www.sqlbits.com/SQLBitsXSaturday Thanks   Chris and Martin   LINQ BOOK winners Andrew Birds Chris Kennedy Dave Carpenter David Forrester Ian Ringrose James Cullen James Simpson Kevan Riley Kirsty Hunter Martin Bell Martin Croft Michael Docherty Naga Anand Ram Mangipudi Neal Atkinson Nick Colebourn Pavel Nefyodov Ralph Baines Rick Hibbert saad saleh Simon Enion Stan Venn Steve Powell Stuart Quinn

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  • How do you educate your teammates without seeming condescending or superior?

    - by Dan Tao
    I work with three other guys; I'll call them Adam, Brian, and Chris. Adam and Brian are bright guys. Give them a problem; they will figure out a way to solve it. When it comes to OOP, though, they know very little about it and aren't particularly interested in learning. Pure procedural code is their MO. Chris, on the other hand, is an OOP guy all the way -- and a cocky, condescending one at that. He is constantly criticizing the work Adam and Brian do and talking to me as if I must share his disdain for the two of them. When I say that Adam and Brian aren't interested in learning about OOP, I suspect Chris is the primary reason. This hasn't bothered me too much for the most part, but there have been times when, looking at some code Adam or Brian wrote, it has pained me to think about how a problem could have been solved so simply using inheritance or some other OOP concept instead of the unmaintainable mess of 1,000 lines of code that ended up being written instead. And now that the company is starting a rather ambitious new project, with Adam assigned to the task of getting the core functionality in place, I fear the result. Really, I just want to help these guys out. But I know that if I come across as just another holier-than-thou developer like Chris, it's going to be massively counterproductive. I've considered: Team code reviews -- everybody reviews everybody's code. This way no one person is really in a position to look down on anyone else; besides, I know I could learn plenty from the other members on the team as well. But this would be time-consuming, and with such a small team, I have trouble picturing it gaining much traction as a team practice. Periodic e-mails to the team -- this would entail me sending out an e-mail every now and then discussing some concept that, based on my observation, at least one team member would benefit from learning about. The downside to this approach is I do think it could easily make me come across as a self-appointed expert. Keeping a blog -- I already do this, actually; but so far my blog has been more about esoteric little programming tidbits than straightforward practical advice. And anyway, I suspect it would get old pretty fast if I were constantly telling my coworkers, "Hey guys, remember to check out my new blog post!" This question doesn't need to be specifically about OOP or any particular programming paradigm or technology. I just want to know: how have you found success in teaching new concepts to your coworkers without seeming like a condescending know-it-all? It's pretty clear to me there isn't going to be a sure-fire answer, but any helpful advice (including methods that have worked as well as those that have proved ineffective or even backfired) would be greatly appreciated. UPDATE: I am not the Team Lead on this team. Chris is. UPDATE 2: Made community wiki to accord with the general sentiment of the community (fancy that).

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  • xcodebuild: error: 'file' is not a workspace file

    - by Vladimir Voitekhovski
    there were no problem but now my job in Jenkins CI failed. I try to rename Xcode workspace like RacingPost.xcworkspace no changes. Try to delete this options at all, this job also failed. Configuration: XCODEPROJECTDIRECTORY=. TARGET_BUILD_DIR=${XCODEPROJECTDIRECTORY}/build XCODEWORKSPACE=RacingPost.xcodeproj XCODESCHEME=UnitTests XCODECONFIGURATION=ENTERPRISE-HD XCODESDK=iphoneos XCODEARGS="TEST_AFTER_BUILD=YES" XCODEBUILD_APP_NAME=RacingPost.app XCODETARGET=UnitTests XCODEPROJECT=RacingPost.xcodeproj IPA_PATH=${TARGET_BUILD_DIR}/RacingPost.ipa xcrun -sdk iphoneos PackageApplication -v "$(${XCTOOL_HOME}/xctool.sh -scheme RacingPost -project ${XCODEPROJECT} -configuration "${XCODECONFIGURATION}" -sdk "${XCODESDK}" -showBuildSettings -workspace ${WORKSPACE}| grep TARGET_BUILD_DIR | cut -d = -f 2 | cut -d . -f 1 | head -1 | sed 's/^[ ^t]*//')/${XCODEBUILD_APP_NAME}" -o "${IPA_PATH}" Output: 17:33:25 ** BUILD SUCCEEDED ** (58104 ms) 17:33:27 [RGP-ODC_RacingPost_iPad_staging] $ /bin/bash -xe /var/folders/df/575wx61n4dzdlw_48pgsjwk40000gn/T/hudson6052564280091633098.sh 17:33:27 + cd . 17:33:27 ++ /Users/epadmin/ci-tools/xctool/xctool.sh -scheme RacingPost -project RacingPost.xcodeproj - configuration ENTERPRISE-HD -sdk iphoneos -showBuildSettings -workspace /Users/epadmin/jenkins-slave/workspace/RGP- ODC_RacingPost_iPad_staging 17:33:27 ++ grep TARGET_BUILD_DIR 17:33:27 ++ cut -d = -f 2 17:33:27 ++ cut -d . -f 1 17:33:27 ++ head -1 17:33:27 ++ sed 's/^[ ^t]*//' 17:33:30 xcodebuild: error: '/Users/epadmin/jenkins-slave/workspace/RGP-ODC_RacingPost_iPad_staging' is not a workspace file. 17:33:30 + xcrun -sdk iphoneos PackageApplication -v /RacingPost.app -o ./build/RacingPost.ipa 17:33:30 error: Specified application doesn't exist or isn't a bundle directory : '/RacingPost.app' 17:33:30 Build step 'Execute shell' marked build as failure My structure of folders on node: epadmin@epclus1macp02:~/jenkins-slave/workspace/RGP-ODC_RacingPost_iPad_staging$ ls drwxr-xr-x 21 epadmin staff 714B May 29 10:28 ./ drwxr-xr-x 37 epadmin staff 1.2K May 29 10:33 ../ drwxr-xr-x 7 epadmin staff 238B May 29 10:28 .svn/ drwxr-xr-x 10 epadmin staff 340B Apr 18 09:02 RacingPost/ drwxr-xr-x 10 epadmin staff 340B May 29 09:27 RacingPost.xcodeproj/ drwxr-xr-x 10 epadmin staff 340B May 7 09:04 RacingPostUtilApp/ drwxr-xr-x 3 epadmin staff 102B May 18 02:16 Source/ drwxr-xr-x 75 epadmin staff 2.5K Apr 16 09:03 UnitTests/ drwxr-xr-x 16 epadmin staff 544B May 29 09:05 _certs/ drwxr-xr-x 3 epadmin staff 102B Apr 15 09:03 _doc/ drwxr-xr-x 4 epadmin staff 136B Apr 15 09:03 _provisioning/ drwxr-xr-x 3 epadmin staff 102B May 29 10:31 build/ -rw-r--r-- 1 epadmin staff 9.9K May 19 04:39 build.xml

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  • Sql order by within a group by with aggregate

    - by NG
    Say I have Team/Name/Some number Cardinals Jason 8 Cardinals Chris 5 Yankees Joba 6 Cubs Carlos 6 Cardinals Chris 6 And I want Cardinals Jason 8 Cardinals Chris 11 Cubs Carlos 6 Yankees Joba 6 So, what I'm doing is grouping by team, grouping by name, summing by some number However, within cardinals I want to make sure the names are in a particular order. If I just do an "order by name desc" for example then the the whole grouping gets ignored. So how can I order within a group.

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