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Percona XtraDB Cluster: Quorum and Availability of the cluster

 | June 12, 2015 |  Posted In: MySQL

Percona XtraDB Cluster (PXC) has become a popular option to provide high availability for MySQL servers. However many people are still having a hard time understanding what will happen to the cluster when one or several nodes leave the cluster (gracefully or ungracefully). This is what we will clarify in this post. Nodes leaving gracefully […]

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Optimizing Percona XtraDB Cluster for write hotspots

 | June 3, 2015 |  Posted In: InnoDB, Insight for DBAs, MySQL, Percona XtraDB Cluster

Some applications have a heavy write workload on a few records – for instance when incrementing a global counter: this is called a write hotspot. Because you cannot update the same row simultaneously from multiple threads, this can lead to performance degradation. When using Percona XtraDB Cluster (PXC), some users try to solve this specific […]

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Storing time-series data with MongoDB and TokuMX

 | May 26, 2015 |  Posted In: MongoDB

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 rate can be high and records are likely to expire after some time. MongoDB and TokuMX are both good fits […]

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Test your knowledge: Percona XtraDB Cluster (PXC) quiz

 | April 28, 2015 |  Posted In: High-availability, Insight for DBAs, MySQL, Percona XtraDB Cluster

I often talk with people who are very interested in the features of Percona XtraDB Cluster (PXC) such as synchronous and parallel replication, multi-node writing and high availability. However some get confused when operating a real PXC cluster because they do not fully realize the implications of these features. So here is a fun way […]

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MySQL shell prompt vs MongoDB shell prompt

 | April 1, 2015 |  Posted In: MySQL

Recently Todd Farmer shared an interesting story about the mysql command line prompt in MySQL 5.7: how it was changed to provide more context and why the change was finally reverted. This made me think that after using the command line client for MongoDB for awhile, I would love seeing a much more modern mysql […]

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Q&A: Multi-threaded Replication in MySQL 5.6 and MySQL 5.7

 | March 13, 2015 |  Posted In: Insight for DBAs, MySQL, Percona Server, Percona XtraDB Cluster, Technical Webinars

My webinar “Multi-threaded Replication in MySQL 5.6 and 5.7” on February 25 generated several excellent questions following the presentation (available here for playback along with the slides). I didn’t have time to answer many of the questions during the session and so in this post I answer all of them. Thanks to everyone who attended! Q: […]

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