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Checking table definition consistency with mysqldiff

 | April 15, 2015 |  Posted In: MySQL

Data inconsistencies in replication environments are a pretty common. There are lots of posts that explain how to fix those using pt-table-checksum and pt-table-sync. Usually we only care about the data but from time to time we receive this question in support: How can I check the table definition consistency between servers? Replication also allow […]

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Sys Schema for MySQL 5.6 and MySQL 5.7

 | November 20, 2014 |  Posted In: Insight for DBAs, MySQL

Performance Schema (P_S) has been available since MySQL 5.5, more than 4 years ago. It is still difficult to see production servers with P_S enabled, even with MySQL 5.6 where the feature is enabled by default. There have been several complaints like the overhead, that the fix is a work in progress, and the ease […]

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How to calculate the correct size of Percona XtraDB Cluster’s gcache

 | September 8, 2014 |  Posted In: Insight for DBAs, MySQL, Percona MySQL Support, Percona Software, Percona XtraDB Cluster

When a write query is sent to Percona XtraDB Cluster all the nodes store the writeset on a file called gcache. By default the name of that file is galera.cache and it is stored in the MySQL datadir. This is a very important file, and as usual with the most important variables in MySQL, the […]

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How to add an existing Percona XtraDB Cluster to Percona ClusterControl

 | April 1, 2014 |  Posted In: Insight for DBAs, MySQL, Percona XtraDB Cluster

In my last blog post I explained how to use Percona ClusterControl to create a new Percona XtraDB Cluster from scratch. That’s a good option when you want to create a testing environment in just some mouse clicks. In this case I’m going to show you how to add your existing cluster to Percona ClusterControl […]

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How to create a new Percona XtraDB Cluster with ClusterControl

 | February 17, 2014 |  Posted In: MySQL, Percona Software, Percona XtraDB Cluster

We recently announced Percona ClusterControl supplied in partnership with Severalnines. This enterprise-grade cluster management and monitoring software is available with a Percona Support contract covering Percona XtraDB Cluster, MySQL Cluster, or MySQL Galera. In this blog post I am going to show you how to use Percona ClusterControl to to create a new 3-node cluster with Percona XtraDB Cluster. Percona […]

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MySQL 5.7 multi-source replication

 | October 2, 2013 |  Posted In: MySQL

Recently Oracle announced several new features for the latest available development version of MySQL that is 5.7.2 at the time of writing this article. Most of them are performance and replication related that show us how incredible the new release will be. In this post I’m going to try to explain in some easy steps […]

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