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  • Need Advice on building the database. all in one table or split?

    - by Ibrahim Azhar Armar
    hello, i am developing an application for a real-estate company. the problem i am facing is about implementing the database. however i am just confused on which way to adopt i would appreciate if you could help me out in reasoning the database implementation. here is my situation. a) i have to store the property details in the database. b) the properties have approximately 4-5 categories to which it will belong for ex : resedential, commnercial, industrial etc. c) now the categories have sub-categories. for example. a residential category will have sub category such as. Apartment / Independent House / Villa / Farm House/ Studio Apartment etc. and hence same way commercial and industrial or agricultural will too have sub-categories. d) each sub-categories will have to store the different values. like a resident will have features like Bedrooms/ kitchens / Hall / bathroom etc. the features depends on the sub categories. for an example on how i would want to implement my application you can have a look at this site. http://www.magicbricks.com/bricks/postProperty.html i could possibly think of the solution like this. a) create four to five tables depending upon the categories which will be existing(the problem is categories might increase in the future). b) create different tables for all the features, location, price, description and merge the common property table into one. for example all the property will have the common entity such as location, total area, etc. what would you advice for me given the current situation. thank you

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  • Force database read to master if slave data is stale

    - by Jeff Storey
    I previously asked a specific question about this database replication for new user signup to which I got an answer, but I want to ask this in the more general sense. I have a database setup in which I am using a master/slave combination. I am using the slaves for load balancing (the data itself is partitioned/sharded across multiple databases, but each database has X slaves for load balancing). Let's say I write some data to the master. Now I do a subsequent read which hits a slave, but the slave has not yet caught up to the master. Is there a way (which can be done quickly since it will happen frequently) to determine if the data is stale in the slave so I can then route to the master? In my previous question, it was suggested to do simultaneous writes to the cache and the database. This solution seems practical, but there is still a chance that the data may have been removed from the cache but not yet updated in the slave. A possible solution is to ensure the cache is big enough (based on the typical application load) so the data will not be evicted within the time frame it takes to replicate the data. This seems like it may be feasible. Can anyone provide additional insight into this question? Thanks!

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  • How to back up a database with thousands of files

    - by Neal
    I am working with a Fedora server that runs a customized software package. The server software is quite old, and its database consists of 1,723 files. The database files are constantly changing - they continually grow and changes are not necessarily appended to the end. So right now, we currently back up every 24 hours at midnight when all users are off of the system and the database is in an internally consistent state. The problem is that we have the potential to lose an entire day's worth of work, which would be unrecoverable. So I'd like to know if there is a way to take some sort of an instantaneous snapshot of these database files that we could back up every 30 minutes or so. I've read about Linux LVM snapshots, and am thinking that I might be able to do accomplish the goal by taking a snapshot, rsync'ing the files to a backup server, then dropping the snapshot. But I've never done this before,so I don't know if this is the "right" fix. Any ideas on this? Any better solutions? Thanks!

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  • Synchronize Active Directory to Database

    - by Tommy Jakobsen
    We are in a situation where we would like to offer our customers to be able to manage their users themselves. It is around 300 customers with up to a total of 10.000 users. Besides creating, updating and removing users, they will very often read information about users for statics and other useful informations available. All this functionality, should be available from an Intranet web page (.NET Framework 4) that the users will access through Citrix or similar. Now the problem is that we would really like the users not to query AD directly for each request, but rather make them hit a database that is synchronized with AD. It would be sufficient to run this synchronization a few time each day (maybe every 5. hour). When they create a user, it should not be available right away, but reviewed and then created within two days (the next step would be to remove this manual review, but that's out of scope for this question). What do you think about this synchronization of AD? Does anyone have any experience with it and is it something that is done in other organizations, where you will have lots of requests which is better handled by a database than AD (I presume)? Are there any techniques out there for writing such a script that synchronizes AD with database tables? My primary concern is the groups/members relations which can be rather complicated. Or are there software that synchronizes AD with a database? Any comments will be much appreciated. Thank you.

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  • Oracle OpenWorld 2012: Focus On Oracle Database

    - by jgelhaus
    As Oracle OpenWorld approaches and you work to plan your schedule.  We know there's a lot to sort through.  To help we've put together some Oracle Database Focus On Documents to help guide you through the database sessions at the show. Oracle Database Oracle Database Application Development Oracle Database Security Oracle Spatial and Graph Oracle Enterprise Manager Cloud Control 12c (and Private Cloud) Big Data Oracle Exadata Data Warehousing High Availability Oracle Database Utilities Oracle Database Upgrade See you in San Francisco!

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  • Oracle Database Express Edition, már 64 bitesen is

    - by user645740
    Az Oracle Database Express Edition egy ingyenes adatbázis-kezelo, amivel ki lehet ingyen próbálni az Oracle Database-t. Support viszont nem áll hozzá rendelkezésre, fórumokat lehet használni ehelyett. Az Oracle Database Express Edition 11gR2 most megjelent 64 bites változatban is: http://www.oracle.com/technetwork/database/database-technologies/express-edition/downloads/index.html Az Oracle Database SE One, SE és EE itt érheto el 30 napos kipróbálásra: http://www.oracle.com/technetwork/database/enterprise-edition/downloads/index.html

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  • question about MySQL database migration

    - by WilliamLou
    Hi there: If I have a MySQL database with several tables on a live server, now I would like to migrate this database to another server. Of course, the migration I mean here involves some database tables, for example: add some new columns to several tables, add some new tables etc.. Now, the only method I can think of is to use some php/python(two scripts I know) script, connect two databases, dump the data from the old database, and then write into the new database. However, this method is not efficient at all. For example: in old database, table A has 28 columns; in new database, table A has 29 columns, but the extra column will have default value 0 for all the old rows. My script still needs to dump the data row by row and insert each row into the new database. Is there any tools or a better method than writing a script yourself? Here, I dont need to worry about multithread writing problems etc.., I mean the old database will be down (not open to public usage etc.., only for upgrade ) for a while. Thanks!!

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  • Cant get php script to connect to asterisk internal mysql database

    - by Bilbo
    Im trying to get a PHP script to connect to Asterisks internal sql database. I tried the to use the standard method for example $con = mysqli_connect("192.168.1.126","root","mysql","asterisk"); However when I log into the asterisk server to access the mysql database all i need it to type "mysql" and im logged in. Im wondering is it possible for my php script to connect to asterisk internal database. //edit The following mysql error is shown Warning: mysqli_connect(): (HY000/2003): Can't connect to MySQL server on '192.168.1.126' (111) in /var/www/html/project/sipSubScript.php on line 6 Failed to connect to MySQL: Can't connect to MySQL server on '192.168.1.126' (111)

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  • Ideas for scaling out database architecture

    - by andrew
    We're looking to scale out our existing database architecture and need some advice on which way to go. We currently have 2 web servers behind a load balancer that both read & write to a single master database which replicates to a slave. Ideally, I'd like each of the webservers to point to their own master DB and have the data between the 2 synchronised but from what I've read, using any kind of master-master or ring-replication is discouraged. I'm looking for a general "what do other people do" kind of answer - database vendor isn't a concern at the moment but we'd like to stay with MySQL or convert to MSSQL. Any ideas would be gratefully received. Many thanks, Andrew

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  • Cant connect to asterisk internal database [on hold]

    - by Bilbo
    Im trying to get a PHP script to connect to Asterisks internal mysql database. I tried the to use the standard method for example $con = mysqli_connect("192.168.1.126","root","mysql","asterisk"); However when I log into the asterisk server to access the mysql database all i need it to type "mysql" and im logged in. Im wondering is it possible for my php script to connect to asterisk internal database. The following error is shown: Warning: mysqli_connect(): (HY000/2003): Can't connect to MySQL server on '192.168.1.126' (111) in /var/www/html/project/sipSubScript.php on line 6 Failed to connect to MySQL: Can't connect to MySQL server on '192.168.1.126' (111)

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  • Application Compatibility Clients do not show in MSSQL database, but do show in \AppCompat\

    - by rjt
    Application Compatibility Clients are not denied access to the central MSSQL database, but are able to leave their own files in the \AppCompat\ share. The only computer that shows up in the "Microsoft Application Compatibility Manager" database is the the machine i initially created the .MSI installer from. The MSI successfullly pushed out via GPO and like i said there are tons of file in the \AppCompat\ share from many different computers. But only 1 pc shows up in the "Data Collection Manager" database, so i only have data from one machine. i could manually add all these machines (ADNETBIOSNAME\MACHINENAME221$) to the MSSQL AppCompat db permissions list or use an SQL command to do so in batch, but i suspect i must have missed something. Do you manually edit the MSI to set the credentials?

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  • Importing photoimpact .ab3 file database into another album program

    - by Mel F
    I have Photoimpact Album v5 which has now maxed out at 65,000 photos with database information. I can export the database and file information to a csv or dbase 4 file but I cannot find any way to import the information to a competative Photo Organization/Database product like Adobe Lightroom, ACDSee Pro3 or Photo Collector, etc... which is more modern, will work on Vista/Windows7, and not have any file limitations. Any help would be greatly appreciated. I really cannot reinput data information for 65,000 photos manually. I would use any good software that I can transfer my files and data ifno to.

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  • Connection to SQL Server 2008 R2 Database Server is SLOW

    - by AbeP
    The database server is a VM running SQL Server 2008 R2 on top of Windows Server 2012, 24GB RAM allocated and 2TB of disk space. Overall, the database connections are very slow and one thing that stands out is that the connection to the database server via SSMS takes 5-10 seconds. On other much less powerful servers, it takes 1-2 seconds. The VM is technically way more powerful than other machines, but the connection to the server is too slow. So, my guess is the issue is network related, but any clues on where I should be looking? Thanks!

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  • Move MySQL database while instance is online

    - by Mike Scott
    I have a MySQL instance containing a number of databases, one of which is an archive database (although using the INNODB rather than ARCHIVE storage engine) that is not queried or written to in normal operation. The data filesystem is filling up and I'd like to move the archive database's data directory to a different filesystem (and then symlink it back, obviously). If there are no SQL statements attempting to query or update the data during the move, can I safely do this while the MySQL instance and the other databases stay online and in use? I plan to rsync the database directory to the new filesystem, then rename the old one on the original filesystem to something different and create the new symlink. lsof reports that MySQL does have the .ibd files open, so presumably it would have to reopen them.

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  • /data/tmp on database server?

    - by Mellon
    I am on a Linux ubuntu machine with MySQL installed. My teacher gave out an assignment which mentioned "copy cars.dat to /data/tmp on the MySQL database server" without any explanations, I do not know what is the "/data/tmp on database server" means exactly? Basically after that I need to execute SQL statement like LOAD DATA INFILE '/data/tmp/cars.dat' INTO TABLE cars So, what does copy cars.dat to /data/tmp on the database server means as there is no /data/tmp directory even? Personally, I checked /etc/mysql/my.cnf file, inside which there are definitions of : ... basedir = /usr datadir = /var/lib/mysql tmpdir = /tmp ... Does it mean to copy cars.dat to the tmpdir which is just /tmp under root directory??

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  • Simplest way to shrink transaction log files on a mirrored production database

    - by MGOwen
    What's the simplest way to shrink transaction log file on a mirrored production database? I have to, as my disk space is running out. I will make a full database backup before I do this, so I don't need to keep anything from the transaction log (right? I have daily full database backup, probably never need point-in-time restore, though I'll keep the option open if I can - that's all the .ldf is really for, correct?). (Hope this isn't an exact duplicate, I read a lot of questions but couldn't find this exact scenario elsewhere).

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  • How to determinate prerequisite of a setup ? DisplayLink on WindowsXP embedded wont start

    - by user35320
    Hi, I want to install DisplayLink on an embedded Windows XP device. The problem is that the setup starts and asked for my approval and after I confirmed it nothing happend. The setup just dissapear. On the official DisplayLink site there they say that they dont support embedded system but there must be a way to get this working on it. So I am searching for a tool to see what the setup is trying to open or what the preerequisite of it are to install it and try to get this working. Thanks for you help

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  • Sql database dumps failing every night

    - by chaseman36
    Hey guys, I have sql05 and my maintenance plan which backs up a database to an external storage SAN, has been failing every night. Here is my error: Executing the query "BACKUP DATABASE [master] TO DISK = N'\\192.168.x.x\vmbackup\server\dbbackup\master_backup_201004222300.bak' WITH NOFORMAT, NOINIT, NAME = N'master_backup_20100422230002', SKIP, REWIND, NOUNLOAD, STATS = 10 " failed with the following error: "Cannot open backup device '\\192.168.x.x\vmbackup\server\dbbackup\master_backup_201004222300.bak'. Operating system error 5(Access is denied.). BACKUP DATABASE is terminating abnormally.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly. I googled this error and tried adding permissions to the backup device for network service as recommended at experts exchange, no dice. Does anyone have any ideas?

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  • Oracle Java Embedded Client 1.1 Released

    - by Roger Brinkley
    Yesterday an update release of Oracle Java Embedded Client (OJEC) 1.1 quietly slipped out door for general availability. Until last year it was pretty difficult to get your hands on either a Connected Limited Device Configuration (CLDC) for small devices or a Connected Device Configuration (CDC) for medium devices java implementation without a substantial initial commitment. But with the the release of OJWC (CLDC) and OJEC (CDC) last year that has changed. OJEC 1.1 is a binary distribution designed for installation on medium configurations which is a mid range processor requiring a  slow startup time, seamless upgrades, in a cost sensitive hardware environment  anywhere from 3.5mb to 8 mb. There are headless as well as headed versions available. It is intended for devices, such as Blu-­-ray Disc players, set-­-top boxes, residential gateways,VOIP phones, and similar. From a software point of view, OJEC is the Java runtime platform implementation of Connected Device Configuration (CDC v1.1, JSR-­-218), Foundation Profile (FP v1.1, JSR-­-219), and Personal Basis Profile (PBP v1.1, JSR-­-217)  and includes optional packages RMI (JSR 66), JDBC (JSR 169) and XML API for Java ME (JSR 280), and Java TV (JSR-­-927). New to this release is support for the XML API (JSR 280) and a number of bug fixes and performance enhancements, including an improved Just-in-Time (JIT) compilation for the x86 chipset architecture. The platforms supported include ArmV5, ArmV6/ArmV7, MIPS 32 74K, and X86 in headless mode. For embedded developers there are number of advantages to using Java and if you have shied away from the JavaME edition in the past I would encourage you to look into the updated version of OJEC 1.1.

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  • Embedded Nashorn in JEditorPane

    - by Geertjan
    Here's a prototype for some kind of backoffice content management system. Several interesting goodies are included, such as an embedded JavaScript editor, as can be seen in the screenshot: Key items of interest in the above are as follows: Embedded JavaScript editor (i.e., the latest and greatest Nashorn technology, look it up, if you're not aware of what that is.) The way that's done is to include the relevant JavaScript modules in your NetBeans Platform application. Make very sure to include "Lexer to NetBeans Bridge", which does a bunch of critical stuff under the hood. The JEditorPane is defined as follows, along the lines that I blogged about recently thanks to Steven Yi: javaScriptPane.setContentType("text/javascript"); EditorKit kit = CloneableEditorSupport.getEditorKit("text/javascript"); javaScriptPane.setEditorKit(kit); javaScriptPane.getDocument().putProperty("mimeType", "text/javascript"); Note that "javaScriptPane" above is simply a JEditorPane. Timon Veenstra's excellent solution for integrating Nodes with MultiViewElements, which is described here by Timon, and nowhere else in the world. The tab you see above is within a pluggable container, so anyone else could create a new module and register their own MultiViewElement such that it will be incorporated into the editor. A small trick to ensure that only one window opens per news item: @NbBundle.Messages("OpenNews=Open") private class OpenNewsAction extends AbstractAction { public OpenNewsAction() { super(Bundle.OpenNews()); } @Override public void actionPerformed(ActionEvent e) { News news = getLookup().lookup(News.class); Mode editorMode = WindowManager.getDefault().findMode("editor"); for (TopComponent tc : WindowManager.getDefault().getOpenedTopComponents(editorMode)) { if (tc.getDisplayName().equals(news.getTitle())) { tc.requestActive(); return; } } TopComponent tc = MultiViews.createMultiView("application/x-newsnode", NewsNode.this); tc.open(); tc.requestActive(); } } The rest of what you see above is all standard NetBeans Platform stuff. The sources of everything you see above is here: http://java.net/projects/nb-api-samples/sources/api-samples/show/versions/7.3/misc/CMSBackOffice

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  • Oracle Java ME Embedded Client 1.1????

    - by sasa
    6?26???????????Java ME????????Oracle Java ME Embedded Client (OJEC) 1.1???????????CDC 1.1.2?Foundation Profile (FP) 1.1.2???????????ARM, MIPS, x86?Linux???????????Security Optional Package, RMI, JDBC, XML API, Web Services?????????????????????????????·???????????? 2011?5???????1.0??????????????XML API???????????????????????????????????????????x86?????????????x86????????Just-in-Time (JIT)?????????????? ?????????????????????(????GUI??)??????????????Linux (x86)?JDK 6?????????????????????? CPU OS ROM RAM ARM (v5) Linux 2.6.31??, glibc 2.10.2?? 5MB?? 8MB?? ARM (v6, v7) Linux 2.6.35??, glibc 2.12.1?? 5MB?? 8MB?? MIPS (MIPS32 74K) Linux 2.6.22??, glibc 2.8?? 5MB?? 8MB?? x86 (Pentium III??) Linux 2.6.35??, glibc 2.12.1?? 5MB??  8MB?? OJEC 1.1??????????????OTN??????????????????????????????????????Java Embedded??????????? OJEC 1.1 ?????? OJEC 1.1 ??????

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  • Big Data – Operational Databases Supporting Big Data – Columnar, Graph and Spatial Database – Day 14 of 21

    - by Pinal Dave
    In yesterday’s blog post we learned the importance of the Key-Value Pair Databases and Document Databases in the Big Data Story. In this article we will understand the role of Columnar, Graph and Spatial Database supporting Big Data Story. Now we will see a few of the examples of the operational databases. Relational Databases (The day before yesterday’s post) NoSQL Databases (The day before yesterday’s post) Key-Value Pair Databases (Yesterday’s post) Document Databases (Yesterday’s post) Columnar Databases (Tomorrow’s post) Graph Databases (Today’s post) Spatial Databases (Today’s post) Columnar Databases  Relational Database is a row store database or a row oriented database. Columnar databases are column oriented or column store databases. As we discussed earlier in Big Data we have different kinds of data and we need to store different kinds of data in the database. When we have columnar database it is very easy to do so as we can just add a new column to the columnar database. HBase is one of the most popular columnar databases. It uses Hadoop file system and MapReduce for its core data storage. However, remember this is not a good solution for every application. This is particularly good for the database where there is high volume incremental data is gathered and processed. Graph Databases For a highly interconnected data it is suitable to use Graph Database. This database has node relationship structure. Nodes and relationships contain a Key Value Pair where data is stored. The major advantage of this database is that it supports faster navigation among various relationships. For example, Facebook uses a graph database to list and demonstrate various relationships between users. Neo4J is one of the most popular open source graph database. One of the major dis-advantage of the Graph Database is that it is not possible to self-reference (self joins in the RDBMS terms) and there might be real world scenarios where this might be required and graph database does not support it. Spatial Databases  We all use Foursquare, Google+ as well Facebook Check-ins for location aware check-ins. All the location aware applications figure out the position of the phone with the help of Global Positioning System (GPS). Think about it, so many different users at different location in the world and checking-in all together. Additionally, the applications now feature reach and users are demanding more and more information from them, for example like movies, coffee shop or places see. They are all running with the help of Spatial Databases. Spatial data are standardize by the Open Geospatial Consortium known as OGC. Spatial data helps answering many interesting questions like “Distance between two locations, area of interesting places etc.” When we think of it, it is very clear that handing spatial data and returning meaningful result is one big task when there are millions of users moving dynamically from one place to another place & requesting various spatial information. PostGIS/OpenGIS suite is very popular spatial database. It runs as a layer implementation on the RDBMS PostgreSQL. This makes it totally unique as it offers best from both the worlds. Courtesy: mushroom network Tomorrow In tomorrow’s blog post we will discuss about very important components of the Big Data Ecosystem – Hive. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Big Data, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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  • Opening a password encrypted access database using DAO VB.NET

    - by prasoon99
    I create a database like this: Sub Main() Dim wrkDefault As Workspace Dim dbE As DBEngine Dim dbs As Database 'Get default Workspace. dbE = New DBEngine wrkDefault = dbE.Workspaces(0) 'Set the database filename Dim DBFilename As String DBFilename = "c:\mydb.mdb" 'Make sure there isn't already a file with the same name of 'the new database file. If Dir(DBFilename) <> "" Then MsgBox("File already exists!") Exit Sub End If 'Create a new encrypted database with the specified 'collating order. 'lock database with the password 'hello' dbs = wrkDefault.CreateDatabase(DBFilename, _ LanguageConstants.dbLangGeneral & ";pwd=hello;", DatabaseTypeEnum.dbEncrypt) dbs.Close() End Sub How do I open this database again in VB.NET using DAO?

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  • Catch database exception in Kohana

    - by danilo
    I'm using Kohana 2. I would like to catch a database exception to prevent an error page when no connection to the server can be established. The error displayed is system/libraries/drivers/Database/Mysql.php [61]: mysql_connect() [function.mysql-connect]: Lost connection to MySQL server at 'reading initial communication packet', system error: 110 The database server is not reachable at all at this point. I'm doing this from a model. I tried both public function __construct() { // load database library into $this->db try { parent::__construct(); } catch (Exception $e) { die('Database error occured'); } } as well as try { $hoststatus = $this->db->query('SELECT x FROM y WHERE z;'); } catch (Exception $e) { die('Database error occured'); } ...but none of them seemed to work. It seems as if no exception gets passed on from the main model. Is there another way to catch the database error and use my own error handling?

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