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Worrying about the ‘InnoDB: detected cycle in LRU for buffer pool (…)’ message?

and  | February 26, 2015 |  Posted In: InnoDB, Insight for DBAs, MySQL

If you use Percona Server 5.5 and you have configured it to use multiple buffer pool instances than sooner or later you’ll see the following lines on the server’s error log and chances are you’ll be worried about them:

Worry not as this is mostly harmless. It’s becoming a February tradition for me (Fernando) […]

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Percona Server 5.6.22-71.0 is now available

 | January 12, 2015 |  Posted In: Events and Announcements, MySQL, Percona Server, Percona Software, TokuDB

Percona is glad to announce the release of Percona Server 5.6.22-71.0 on January 12, 2015. Download the latest version from the Percona web site or from the Percona Software Repositories. Based on MySQL 5.6.22, including all the bug fixes in it, Percona Server 5.6.22-71.0 is the current GA release in the Percona Server 5.6 series. Percona Server is open-source […]

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How well does your table fit in the InnoDB buffer pool in MySQL 5.6+?

 | December 29, 2014 |  Posted In: InnoDB, Insight for DBAs, MySQL, Percona Server

Some time ago, Peter Zaitsev posted a blog titled “How well does your table fits in innodb buffer pool?” He used some special INFORMATION_SCHEMA tables developed for Percona Server 5.1 to report how much of each InnoDB table and index resides in your buffer pool. As Peter pointed out, you can use this view into […]

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Testing backup locks during Xtrabackup SST on Percona XtraDB Cluster

 | December 22, 2014 |  Posted In: MySQL, Percona XtraBackup, Percona XtraDB Cluster

Background on Backup Locks I was very excited to see Backup locks support in release notes for the latest Percona XtraDB Cluster 5.6.21 release. For those who are not aware, backup locks offer an alternative to FLUSH TABLES WITH READ LOCK (FTWRL) in Xtrabackup. While Xtrabackup can hot-copy Innodb, everything else in MySQL must be locked (usually […]

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Google Compute Engine adds Percona XtraDB Cluster to click-to-deploy process

 | November 21, 2014 |  Posted In: Cloud and MySQL, MySQL, MySQL DBaaS, Percona XtraDB Cluster

I’m happy to announce that Google has added Click-to-deploy functionality for Percona XtraDB Cluster (PXC) on Google Cloud Compute nodes. This gives you the ability to rapidly spin up a cluster for experimentation, performance testing, or even production use on Google Compute Engine virtual machines. What is Percona XtraDB Cluster? Percona XtraDB Cluster is a […]

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MySQL’s INNODB_METRICS table: How much is the overhead?

 | November 18, 2014 |  Posted In: Benchmarks, InnoDB, MySQL

Starting with MySQL 5.6 there is an INNODB_METRICS table available in INFORMATION_SCHEMA which contains some additional information than provided in the SHOW GLOBAL STATUS output – yet might be more lightweight than PERFORMANCE_SCHEMA. Too bad INNODB_METRICS was designed during the Oracle-Sun split under MySQL leadership and so it covers only InnoDB counters. I think this […]

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How to deal with MySQL deadlocks

 | October 28, 2014 |  Posted In: InnoDB, Insight for DBAs, MySQL, Percona Server

A deadlock in MySQL happens when two or more transactions mutually hold and request for locks, creating a cycle of dependencies. In a transaction system, deadlocks are a fact of life and not completely avoidable. InnoDB automatically detects transaction deadlocks, rollbacks a transaction immediately and returns an error. It uses a metric to pick the […]

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