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Why is the ibdata1 file continuously growing in MySQL?

 | August 20, 2013 |  Posted In: Insight for DBAs, MySQL, Percona MySQL Support, Percona Server, Percona Software

We receive this question about the ibdata1 file in MySQL very often in Percona Support. The panic starts when the monitoring server sends an alert about the storage of the MySQL server – saying that the disk is about to get filled. After some research you realize that most of the disk space is used […]

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How to create a new (or repair a broken) GTID based slave with Percona XtraBackup

 | May 9, 2013 |  Posted In: Insight for DBAs, MySQL, Percona XtraBackup

Percona XtraBackup 2.0.7 has been published with support for GTID based replication. As promised, here is the step-by-step guide on how to create a new GTID based slave (or repair a broken one) using XtraBackup. The process is pretty straightforward. 1- Take a backup from any server on the replication environment, master or slave:


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MySQL optimizer: ANALYZE TABLE and Waiting for table flush

 | February 27, 2013 |  Posted In: MySQL

The MySQL optimizer makes the decision of what execution plan to use based on the information provided by the storage engines. That information is not accurate in some engines like InnoDB and they are based in statistics calculations therefore sometimes some tune is needed. In InnoDB these statistics are calculated automatically, check the following blog […]

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How to create/restore a slave using GTID replication in MySQL 5.6

 | February 8, 2013 |  Posted In: MySQL

MySQL 5.6 is GA! Now we have new things to play with and in my personal opinion the most interesting one is the new Global Transaction ID (GTID) support in replication. This post is not an explanation of what is GTID and how it works internally because there are many documents about that: http://dev.mysql.com/doc/refman/5.6/en/replication-gtids-concepts.html One […]

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Logging Foreign Key errors

 | September 27, 2012 |  Posted In: MySQL

In the last blog post I wrote about how to log deadlock errors using Percona Toolkit. Foreign key errors have the same problems. InnoDB only logs the last error in the output of SHOW ENGINE INNODB STATUS, so we need another similar tool in order to have historical data. pt-fk-error-logger This is a tool very […]

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Logging Deadlock errors

 | September 19, 2012 |  Posted In: Insight for Developers, MySQL

The principal source of information for InnoDB diagnostics is the output of SHOW ENGINE INNODB STATUS but there are some sections that are not very useful. For example, LATEST DETECTED DEADLOCK only shows, as the name implies, the latest error detected. If you have 100 deadlocks per minute you will be able to see only […]

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How to lag a slave behind to avoid a disaster

 | September 11, 2012 |  Posted In: MySQL

MySQL Replication is useful and easy to setup. It is used for very different purposes. For example: split read and writes run data mining or reporting processes on them disaster recovery Is important to mention that a replication server is not a backup by itself. A mistake on the master, for example a DROP DATABASE […]

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