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Percona Server 5.1.73-14.12 is now available
Percona Server version 5.1.73-14.12Percona is glad to announce the release of Percona Server 5.1.73-14.12 on July 31st, 2014 (Downloads are available here and from the Percona Software Repositories)....
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Innodb transaction history often hides dangerous ‘debt’
In many write-intensive workloads Innodb/XtraDB storage engines you may see hidden and dangerous “debt” being accumulated – unpurged transaction “history” which if not kept in check over time will...
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Optimizing MySQL for Zabbix
This blog post was inspired by my visit at the annual Zabbix Conference in Riga, Latvia this year, where I gave a couple of talks on MySQL and beyond.It was a two day single-track event with some 200...
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MySQL’s INNODB_METRICS table: How much is the overhead?
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...
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Sys Schema for MySQL 5.6 and MySQL 5.7
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...
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InnoDB crash recovery speed in MySQL 5.6
It has been a while since I have looked at InnoDB crash recovery. A lot has change in the last few years – we have serious crash recovery performance improvements in MySQL 5.5 and MySQL 5.6, we have...
View ArticleThe MySQL Query Cache: How it works, plus workload impacts (good and bad)
Query caching is one of the prominent features in MySQL and a vital part of query optimization. It is important to know how it works as it has the potential to cause significant performance...
View ArticleWorrying about the ‘InnoDB: detected cycle in LRU for buffer pool (…)’ message?
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...
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Q&A: Multi-threaded Replication in MySQL 5.6 and MySQL 5.7
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...
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Measuring the impact of tcpdump on Very Busy Hosts
A few years back Deva wrote about how to use tcpdump on very busy hosts. That post sparked my interest about exploring how to measure the impact of tcpdump on very busy hosts. In this post, I wanted to...
View ArticleIs 80% of RAM how you should tune your innodb_buffer_pool_size?
It seems these days if anyone knows anything about tuning InnoDB, it’s that you MUST tune your innodb_buffer_pool_size to 80% of your physical memory. This is such prolific tuning advice, it seems...
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Percona XtraDB Cluster 5.6.24-25.11 is now available
Percona is glad to announce the new release of Percona XtraDB Cluster 5.6 on June 3rd 2015. Binaries are available from downloads area or from our software repositories.Based on Percona Server...
View ArticleUsing 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...
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Testing TokuDB’s Group Commit Algorithm Improvement
The MySQL 5.6 Release has introduced some changes to how two phase commit works and is managed. In particular, the commit phase of transactions to the binary log is now serialized and this behavior is...
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The MySQL query cache: Worst enemy or best friend?
During the last couple of months I have been involved in an unusually high amount of performance audits for e-commerce applications running with Magento. And although the systems were quite different,...
View ArticleOptimizing PXC Xtrabackup State Snapshot Transfer
State Snapshot Transfer (SST) at a glancePXC uses a protocol called State Snapshot Transfer to provision a node joining an existing cluster with all the data it needs to synchronize. This is analogous...
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