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  • MySQL Open Source Backup and Recovery Alternative: Xtrabackup

    MySQL database administrators are always looking for a solid backup and recovery tool that will suit all their needs. Xtrabackup, created by Percona, is the open source alternative to the commercial Innodb Hot Backup tool. This article explains a good methodology for testing and verifying Xtrabackups capabilities and precision.

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  • MySQL Open Source Backup and Recovery Alternative: Xtrabackup

    MySQL database administrators are always looking for a solid backup and recovery tool that will suit all their needs. Xtrabackup, created by Percona, is the open source alternative to the commercial Innodb Hot Backup tool. This article explains a good methodology for testing and verifying Xtrabackups capabilities and precision.

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  • How to disable or tune filesystem cache sharing for OpenVZ?

    - by gertvdijk
    For OpenVZ, an example of container-based virtualization, it seems that host and all guests are sharing the filesystem cache. This sounds paradoxical when talking about virtualization, but this is actually a feature of OpenVZ. It makes sense too. Because only one kernel is running, it's possible to benefit from sharing the same pages of filesystem cache in memory. And while it sounds beneficial, I think a set up here actually suffers in performance from it. Here's why I think why: my machines aren't actually sharing any files on disk so I can't benefit from this feature in OpenVZ. Several OpenVZ machines are running MySQL with MyISAM tables. MyISAM relies on the system's filesystem cache for caching of data files, unlike InnoDB's buffer pool. Also some virtual machines are known to do heavy and large I/O operations on the same filesystem in the host. For example, when running cat *.MYD > /dev/null on some large database in one machine, I saw the filesystem cache lowering in another, monitored by htop. This essentially flushes all the useful filesystem cache in guests (FIFO) and so it flushes the MySQL caches in the guests. Now users are complaining that MySQL is very slow. And it is. Some simple SELECT queries take several seconds on times disk I/O is heavily used by other machines. So, simply put: Is there a way to avoid filesystem cache being wiped out by other virtual machines in container-based virtualization? Some thoughts: Choosing algorithm for flushing filesystem cache in the kernel. (possible? how?) Reserving a certain amount of pages for a single VM. (seems no option for filesystem cache type of pages that reading man vzctl) Will running MySQL on another filesystem get me anywhere? If not, I think my alternatives are: Use KVM for MySQL-MyISAM running VMs. KVM actually assigns memory to the VM and does not allow swapping out caches unless using a balloon driver. Move to InnoDB and tune the buffer pools, dirty pages, etc. This is now considered to be 'nice to have' on the long-term as not everyone responsible for administration of the system understands InnoDB. more suggestions welcome. System software: Proxmox (now 1.9, could be upgraded to 2.x). One big LV assigned for the VMs.

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  • Convert MySQL to an MS SQL Server 2008 Database

    Converting a MySQL database to an MS SQL Server 2 8 database is a bit tricky. It is however an important database migration conversion. Is there some way to do it without resorting to costly database conversion software or facing issues with ODBC connectivity This article will teach you a new method to help you accomplish this conversion.... Test Drive the Next Wave of Productivity Find Microsoft Office 2010 and SharePoint 2010 trials, demos, videos, and more.

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  • ERROR : MySQL server has gone away while running query

    - by Rashmi Nama
    I am using ubuntu 12.04 version. I am connecting properly to MariaDB from command prompt,I have a database named Dealer and have some tables in it but when i running any query, it gives an error.My steps as follow: mysql -uroot -proot use dealer; select * from dealer_outlet limit 1; now error occours ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 3 Current database: dealer ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (111 "Connection refused") ERROR: Can't connect to the server

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  • Write SQL Code for MySQL Using HeidiSQL 4

    HeidiSQL is a free GUI client for MySQL, favored by many Web developers and database administrators of small to medium-sized businesses to manage persistent storage of data. This article will familiarize you with HeidiSQL&#146;s Query editor by using it to write a query that will join four tables together to perform searches against a help library.

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  • How to use multiple search keys?

    - by user32565
    I have a database wherein the files are named abcd100.00b, abcd101.00b, etc. I need a code where when the user enters abcd separate then 100 to 110, all the files with the name abcd and in the range 100 to 110 should get displayed now the following code can display only the first four characters. How do I implement this? <?php //capture search term and remove spaces at its both ends if the is any $searchTerm = trim($_GET['keyname']) ; //check whether the name parsed is empty if($searchTerm == "rinex_file") { echo "Enter name you are searching for."; exit(); } if($searchTerm == "rinex_file") { echo "Enter name you are searching for."; exit(); } //database connection info $host = "localhost"; //server $db = "rinex"; //database name $user = "m"; //dabases user name $pwd = "c"; //password //connecting to server and creating link to database $link = mysqli_connect($host, $user, $pwd, $db); //MYSQL search statement $query = "SELECT * FROM rinexo WHERE rinex_file LIKE '%$searchTerm%'"; $results = mysqli_query($link, $query) ; /* check whethere there were matching records in the table by counting the number of results returned */ if(mysqli_num_rows($results) >= 1){ echo '<table border="1"> <tr> <th>rinex version</th> <th>program</th> <th>date</th> <th>maker name</th> <th>maker number</th> <th>observer</th> <th>agency</th> <th>position_X_Y_Z</th> </tr>'; while($row = mysqli_fetch_array($results)){ echo '<tr> <td>'.$row['rinex_version'].'</td> <td>'.$row['pgm'].'</td> <td>'.$row['date'].'</td> <td>'.$row['marker_name'].'</td> <td>'.$row['marker_no'].'</td> <td>'.$row['observer'].'</td> <td>'.$row['agency'].'</td> <td>'.$row['position_X_Y_Z'].'</td> </tr>'; } echo '</table>'; }else{ echo "There was no matching record for the name " . $searchTerm; }

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  • Even More Maatkit for MySQL

    As MySQL has evolved and added sophisticated and newer features, there are some areas that remain a bit rough around the edges. Maatkit offers a whole slew of tools for doing backup and restore, finding tables, monitoring your database server and many other database administration tasks you may not have even thought of.

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  • Even More Maatkit for MySQL

    As MySQL has evolved and added sophisticated and newer features, there are some areas that remain a bit rough around the edges. Maatkit offers a whole slew of tools for doing backup and restore, finding tables, monitoring your database server and many other database administration tasks you may not have even thought of.

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  • Top 10 MySQL GUI Tools

    <b>Database Journal:</b> "Many third parties create rich applications to facilitate database management, database development and database administration. Here are ten outstanding graphical interfaces for MySQL."

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  • Top 10 MySQL GUI Tools

    Many third parties create rich applications to facilitate database management, database development and database administration. Here are ten outstanding graphical interfaces for MySQL.

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  • Top 10 MySQL GUI Tools

    Many third parties create rich applications to facilitate database management, database development and database administration. Here are ten outstanding graphical interfaces for MySQL.

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  • MySQL Prepared Statements to Generate Crosstab SQL

    MySQL Reporting requirements sometimes require both unknown column and row values, necessitating a more powerful means of generating crosstabs. Today's article presents Prepared Statements, which dynamically generate the SQL and assign it to a variable so that we can tailor the output based on the number of data values.

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  • MySQL Prepared Statements to Generate Crosstab SQL

    MySQL Reporting requirements sometimes require both unknown column and row values, necessitating a more powerful means of generating crosstabs. Today's article presents Prepared Statements, which dynamically generate the SQL and assign it to a variable so that we can tailor the output based on the number of data values.

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  • MySQL Prepared Statements to Generate Crosstab SQL

    <b>Database Journal:</b> "MySQL Reporting requirements sometimes require both unknown column and row values, necessitating a more powerful means of generating crosstabs. Today's article presents Prepared Statements, which dynamically generate the SQL and assign it to a variable so that we can tailor the output based on the number of data values."

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  • Restoring MySQL dump - ERROR 2006 (HY000)

    - by matcheek
    I am just trying to restore a mysql dump. Below are the command and error message. Can anybody give me some clues how to approach this? 10:54:16 Restoring C:\Users\matcheek\Documents\dumps\Dump20120405-1.sql Running: mysql.exe "--defaults-extra-file="d:\temp\tmpbvhy4i.cnf" " --host=127.0.0.1 --user=root --port=3306 --default-character-set=utf8 --comments < "C:\\Users\\matcheek\\Documents\\dumps\\Dump20120405-1.sql" ERROR 2006 (HY000) at line 271: MySQL server has gone away

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  • Survey of MySQL Storage Engines

    MySQL has an interesting architecture that sets it apart from some other enterprise database systems. It allows you to plug in different modules to handle storage. What that means to end users is that it is quite flexible, offering an interesting array of different storage engines with different features, strengths, and tradeoffs.

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  • Survey of MySQL Storage Engines

    MySQL has an interesting architecture that sets it apart from some other enterprise database systems. It allows you to plug in different modules to handle storage. What that means to end users is that it is quite flexible, offering an interesting array of different storage engines with different features, strengths, and tradeoffs.

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  • Five Indispensable MySQL Tools

    <b>Developer.com:</b> "Thanks to a number of well-designed tools, MySQL simply is a very easy database to "talk to," a convenience which is particularly important because developers often are tasked not only with constructing very complex schemas and queries, but also with monitoring overall server health and performance."

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  • How to have mulptiple search keys using one filename

    - by user107020
    I have a database wherein the files are named abcd100.00b, abcd101.00b,..... i need a code where wen the user enters abcd separate then 100 to 110 . all the files with the name abcd and in the range 100 to 110 should get displayed now the following code can display pnly the first four characters how do i implement this?????? <?php //capture search term and remove spaces at its both ends if the is any $searchTerm = trim($_GET['keyname']) ; //check whether the name parsed is empty if($searchTerm == "rinex_file") { echo "Enter name you are searching for."; exit(); } if($searchTerm == "rinex_file") { echo "Enter name you are searching for."; exit(); } //database connection info $host = "localhost"; //server $db = "rinex"; //database name $user = "m"; //dabases user name $pwd = "c"; //password //connecting to server and creating link to database $link = mysqli_connect($host, $user, $pwd, $db); //MYSQL search statement $query = "SELECT * FROM rinexo WHERE rinex_file LIKE '%$searchTerm%'"; $results = mysqli_query($link, $query) ; /* check whethere there were matching records in the table by counting the number of results returned */ if(mysqli_num_rows($results) >= 1){ echo '<table border="1"> <tr> <th>rinex version</th> <th>program</th> <th>date</th> <th>maker name</th> <th>maker number</th> <th>observer</th> <th>agency</th> <th>position_X_Y_Z</th> </tr>'; while($row = mysqli_fetch_array($results)){ echo '<tr> <td>'.$row['rinex_version'].'</td> <td>'.$row['pgm'].'</td> <td>'.$row['date'].'</td> <td>'.$row['marker_name'].'</td> <td>'.$row['marker_no'].'</td> <td>'.$row['observer'].'</td> <td>'.$row['agency'].'</td> <td>'.$row['position_X_Y_Z'].'</td> </tr>'; } echo '</table>'; }else{ echo "There was no matching record for the name " . $searchTerm; }

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  • Find out the clients of your MySQL server

    <b>Linux Admin Zone:</b> "Sometimes in large deployments, there are cases when MySQL server, setup by you long time back which has been in use by multiple teams in your organization, needs some change or update or intrupption in its service and you are in need to know how many clients are there which connects to this server."

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