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Find unused indexes on MongoDB and TokuMX

 | August 21, 2015 |  Posted In: MongoDB

Finding and removing unused indexes is a pretty common technique to improve overall performance of relational databases. Less indexes means faster insert and updates but also less disk space used. The usual way to do it is to log all queries’ execution plans and then get a list of those indexes that are not used. […]

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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 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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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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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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