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MySQL replication primer with pt-table-checksum and pt-table-sync

MySQL replication is a process that allows you to easily maintain multiple copies of MySQL data by having them copied automatically from a master to a slave database. It’s essential to make sure the slave …

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MySQL QA Episode 12: My server is crashing… Now what? For customers or users experiencing a crash

My server is crashing… Now what? This special episode in the MySQL QA Series is for customers or users experiencing a crash. A crash? Cheat sheet: https://goo.gl/rrmB9i Sever install & crash. Note this is as a demonstration: do …

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PXC – Incremental State transfers in detail

IST Basics State transfers in Galera remain a mystery to most people.  Incremental State transfers (as opposed to full State Snapshot transfers) are used under the following conditions: The Joiner node reports Galera a valid …

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The Q&A: Creating best-in-class backup solutions for your MySQL environment

Thank you for attending my July 15 webinar, “Creating Best in Class Backup solutions for your MySQL environment.” Due to the amount of content we discussed and some minor technical difficulties faced near the end …

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Bypassing SST in Percona XtraDB Cluster with incremental backups

Beware the SST In Percona XtraDB Cluster (PXC) I often run across users who are fearful of SSTs on their clusters. I’ve always maintained that if you can’t cope with a SST, PXC may not …

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MySQL QA Episode 4: QA Framework Setup Time!

Welcome to MySQL QA Episode 4! In this episode we’ll look into setting up our QA Framework: percona-qa, pquery, reducer & more. 1. All about percona-qa 2. pquery

3. reducer.sh

4. Short introduction to …

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TOI wsrep_RSU_method in PXC 5.6.24 and up

I noticed that in the latest release of Percona XtraDB Cluster (PXC), the behavior of wsrep_OSU_method changed somewhat.  Prior to this release, the variable was GLOBAL only, meaning to use it you would:

This …

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Using Cgroups to Limit MySQL and MongoDB memory usage

Quite often, especially for benchmarks, I am trying to limit available memory for a database server (usually for MySQL, but recently for MongoDB also). This is usually needed to test database performance in scenarios with …

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Storing time-series data with MongoDB and TokuMX

Storing time-series data is a frequent pattern for databases – be it for logs or for any kind of monitoring. Such data has the following properties: records are inserted but also never updated, the insertion …

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Percona security update: oCERT and SSL improvements

We have recently become a member of oCERT to aid in allowing responsible disclosure for Percona products and services as can be seen on their members page. We are presently working on the verbiage for …

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