Tag: MySQL

Designing Index to Eliminate Sorting

Using algorithm described in “Relational Database Index Design and the Optimizers by Tapio Lahdenmaki and Mike Leach”, I quickly came up with two indexes and while first one looked fine, I was really confused by the second one for the elimination of the sort. Let me show an example, not copy one from the book, but rather show a test I did with MySQL.

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Enhancing Performance in WordPress by Moving from MyISAM to Innodb

WordPress is a really cool open source tool for easy web design and blogging. Unfortunately, it has limitations related to the use of MyISAM as a storage engine. But, there is good news, Word Press Supports InnoDB! Here are some approaches to set this up for your environment.

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Log Buffer #222, A Carnival of the Vanities for DBAs

Bloggers are touching base with the technologies which they cherish most and coming back with some master strokes. This new cool edition of Log Buffer, the coolest blog carnival covering hottest topics encompass that home coming. Now Chill with Log Buffer #222!!!

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Beginner’s Guide to MariaDB and mysqltuner 2.0 videos now online!

I am currently on my way to Percona Live in NYC.  For those that cannot be there, I have posted some new videos from Open DB Camp in Sardinia, Italy earlier this month. It will not be the same as…

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Log Buffer #221, A Carnival of the Vanities for DBAs

Another medley of database blogs under the famous banner of Log Buffer is in your virtual hands. This edition of Log Buffer, the Log Buffer #221 puts spotlight on the fresh and cool blogs from Oracle, MySQL and SQL Server arena.

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Using KateSQL to connect to an Oracle database in Kate

Among the features announced with the release of version 4.6 of the KDE Software Compilation is KateSQL, a SQL Query plugin for the Kate text editor. It leverages the Qt SQL module, enabling connections to most types of databases, and includes support for MySQL and SQLite. In this post I’ll show you how to get it to connect to Oracle databases.

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InnoDB error: Total number of locks exceeds the lock table size

Recently, one of our customers had a problem with one of their replication slaves where a sql statement gave an error while executing on the slave which was executed successfully on the Master server. The slave stopped with the error. We found the main difference in MySQL configuration between Master and Slave was the amount of memory allocated to innodb_buffer_pool_size because Slave was running several MySQL instances that were used for backup purposes. We need to increase the memory of innodb_buffer_pool_size variable where the locks table can fit in the configuration file and restart the database. This should fix the problem.

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Log Buffer #220, A Carnival of the Vanities for DBAs

When big news is released, the world of modern information shakes – and nowhere is this more visible than with the blogs. Log Buffer is the ideal joint for the shakers and movers of the blogosphere. This edition Log Buffer #220 sheds a spotlight on those hot spots.

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Replication Issues: Never purge logs before slave catches them!!

A customer contacted us regarding a problem with one of their replication servers. We found they had deleted some binary logs from the master and relay logs from the slave to release space. It is not a good idea to delete logs that aren’t cached by the slave, in case they are needed. At least keep relay logs in slave to keep the replication working.

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Log Buffer #219, A Carnival of the Vanities for DBAs

There are plethora of thrilling business software trends on the horizon as the summer of 2011 starts. Many of these will significantly impact IT organizations seeking to align IT operations with business objectives. Awareness of such trends can help you to keep ahead of the competition. What better way to get abreast of these trends in a nutshell than the Log Buffer? Log Buffer #219 is in your hands to enjoy.

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