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MySQL Performance Blog

MySQL Performance Blog
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Percona's Data performance and scalability blog
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InnoDB’s multi-versioning handling can be Achilles’ heel

MySQL Performance Blog - Wed, 17/12/2014 - 4:05pm

I believe InnoDB storage engine architecture is great for a lot of online workloads, however, there are no silver bullets in technology and all design choices have their trade offs. In this blog post I’m going to talk about one important InnoDB limitation that you should consider. InnoDB is a multiversion concurrency control (MVCC) storage […]

OpenStack Live tutorials & sessions to bring OpenStack users up to speed

MySQL Performance Blog - Tue, 16/12/2014 - 5:28pm

I attended the OpenStack Paris summit last month (Percona had a booth there). It was my first opportunity to meet face-to-face with this thriving community of developers and users. I’m proud that Percona is part of this open source family and look forward to reconnecting with many of the developers and users I met in […]

MySQL Tutorials: A time to learn at Percona Live 2015

MySQL Performance Blog - Mon, 15/12/2014 - 8:00am

The many hours of intensive tutorials, led by some of the top minds in MySQL, have always been a major draw each year to the Percona Live MySQL Conference and Expo. And 2015’s event will be no exception. Percona Live 2015 runs April 13-16 in Santa Clara, Calif. and the first day is dedicated to […]

The post MySQL Tutorials: A time to learn at Percona Live 2015 appeared first on MySQL Performance Blog.

Percona XtraBackup 2.2.7 is now available

MySQL Performance Blog - Wed, 10/12/2014 - 3:03pm

Percona is glad to announce the release of Percona XtraBackup 2.2.7 on December 10, 2014. Downloads are available from our download site or Percona Software Repositories. Percona XtraBackup enables MySQL backups without blocking user queries, making it ideal for companies with large data sets and mission-critical applications that cannot tolerate long periods of downtime. Offered […]

Recover MySQL root password without restarting MySQL (no downtime!)

MySQL Performance Blog - Wed, 10/12/2014 - 8:00am

Disclaimer: Do this at your own risk! It doesn’t apply if you’re using Pluggable authentication and certainly won’t be usable if/when MySQL system tables are stored on InnoDB What is the situation? The situation is the classic “need to recover MySQL root password” but you cannot restart MySQL (because it is the master production server, […]

OpenStack Live 2015: Sneak peak of the April conference

MySQL Performance Blog - Tue, 09/12/2014 - 5:00pm

On behalf of the OpenStack Live Conference Committee, I am excited to announce the sneak peek schedule for the inaugural OpenStack Live 2015 Conference! This new annual conference, running in parallel with the already established Percona Live MySQL Conference and Expo, will feature one day of tutorials followed by a full day of breakout sessions April 13-14, in […]

MySQL 5.6 Transportable Tablespaces best practices

MySQL Performance Blog - Tue, 09/12/2014 - 8:00am

In MySQL 5.6 Oracle introduced a Transportable Tablespace feature (copying tablespaces to another server) and Percona Server adopted it for partial backups which means you can now take individual database or table backups and your destination server can be a vanilla MySQL server. Moreover, since Percona Server 5.6, innodb_import_table_from_xtrabackup is obsolete as Percona Server also […]

What happens when your application cannot open yet another connection to MySQL

MySQL Performance Blog - Mon, 08/12/2014 - 3:57pm

Have you ever experienced a situation where one moment you can connect to the MySQL database and the next moment  you cannot, only to be able to connect again a second later? As you may know one cannot open infinite connections with MySQL. There’s a practical limit and more often than not it is imposed […]

Streamlined Percona XtraDB Cluster (or anything) testing with Consul and Vagrant

MySQL Performance Blog - Fri, 05/12/2014 - 12:00pm

Introducing Consul I’m always interested in what Mitchell Hashimoto and Hashicorp are up to, I typically find their projects valuable.  If you’ve heard of Vagrant, you know their work. I recently became interested in a newer project they have called ‘Consul‘.  Consul is a bit hard to describe.  It is (in part): Highly consistent metadata […]

MySQL and OpenStack deep dive: Dec. 10 webinar

MySQL Performance Blog - Thu, 04/12/2014 - 9:59pm

Fact: MySQL is the most commonly used database in OpenStack deployments. Of course that includes a number of MySQL variants – standard MySQL by Oracle, MariaDB, Percona Server, MySQL Galera, Percona XtraDB Cluster, etc. However, there are many misconceptions and myths around the pros and cons of these MySQL flavors. Join me and my friend […]

Sneak peek at the Percona Live MySQL Conference & Expo 2015

MySQL Performance Blog - Thu, 04/12/2014 - 1:55pm

You know you’ll be there so why not save some $$ by registering now for the Percona Live MySQL Conference & Expo 2015 (April 13-16 in Santa Clara, Calif.). Super Saver registration discounts are available through Dec. 14 at 11:30 p.m. PST. (That’s just 10 days away!) What to expect this year? The Percona Live […]

Auto-bootstrapping an all-down cluster with Percona XtraDB Cluster

MySQL Performance Blog - Wed, 03/12/2014 - 12:01pm

One new feature in Percona XtraDB Cluster (PXC) in recent releases was the inclusion of the ability for an existing cluster to auto-bootstrap after an all-node-down event.  Suppose you lose power on all nodes simultaneously or something else similar happens to your cluster. Traditionally, this meant manually re-bootstrapping the cluster, but not any more. How it […]

Tips from the trenches for over-extended MySQL DBAs

MySQL Performance Blog - Tue, 02/12/2014 - 8:00am

This post is a follow-up to my November 19 webinar, “Tips from the Trenches: A Guide to Preventing Downtime for the Over-Extended DBA,” during which I described some of the most common reasons DBAs experience avoidable downtime. The session was aimed at the “over-stretched DBA,” identified as the MySQL DBA short of time or an […]

Faster restarts for MySQL and Percona Server 5.6.21+

MySQL Performance Blog - Mon, 01/12/2014 - 12:34pm

By default in MySQL 5.6, each time MySQL is started (regular start or crash recovery), it iterates through all the binlog files when GTIDs are not enabled. This can take a very long time if you have a large number of binary log files. MySQL and Percona Server 5.6.21+ have a fix with the simplified-binlog-gtid-recovery […]

MySQL benchmarking: Know your baseline variance!

MySQL Performance Blog - Wed, 26/11/2014 - 11:00am

Often enough I find MySQL benchmark results where the difference between results is 1% or even less and some conclusions are drawn. Now it is not that 1% is not important – especially when you’re developing the product you should care about those 1% improvements or regressions because they tend to add up. However with […]

Percona XtraDB Cluster 5.6.21-25.8 is now available

MySQL Performance Blog - Tue, 25/11/2014 - 3:45pm

Percona is glad to announce the new release of Percona XtraDB Cluster 5.6 on Novmeber 25th 2014. Binaries are available from downloads area or from our software repositories. We’re also happy to announce that Ubuntu 14.10 and CentOS 7 users can download, install, and upgrade Percona XtraDB Cluster 5.6 from Percona’s software repositories. Based on […]

(More) Secure local passwords in MySQL 5.6 and up

MySQL Performance Blog - Tue, 25/11/2014 - 8:00am

I log into a lot of different servers running MySQL and one of the first things I do is create a file in my home directory called ‘.my.cnf’ with my credentials to that local mysql instance: [crayon-547461b02aaa3474314448/] This means I don’t have to type my password in every time, nor am I tempted to include […]

Percona Server 5.6.21-70.1 is now available

MySQL Performance Blog - Mon, 24/11/2014 - 3:28pm

Percona is glad to announce the release of Percona Server 5.6.21-70.1 on November 24, 2014. Download the latest version from the Percona web site or from the Percona Software Repositories. Based on MySQL 5.6.21, including all the bug fixes in it, Percona Server 5.6.21-70.1 is the current GA release in the Percona Server 5.6 series. Percona Server is […]

Schema changes in MySQL for OpenStack Trove users

MySQL Performance Blog - Mon, 24/11/2014 - 8:00am

People using OpenStack Trove instances can hit a common issue in the MySQL world: how to perform schema change operations while minimizing the impact on the database server? Let’s explore the options that can allow online schema changes. Summary With MySQL 5.5, pt-online-schema-change from Percona Toolkit is your best option for large tables while regular […]

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

MySQL Performance Blog - Fri, 21/11/2014 - 4:00pm

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 […]

Sys Schema for MySQL 5.6 and MySQL 5.7

MySQL Performance Blog - Thu, 20/11/2014 - 2:31pm

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 […]

The post Sys Schema for MySQL 5.6 and MySQL 5.7 appeared first on MySQL Performance Blog.

How a set of queries can be killed in MySQL using Percona Toolkit’s pt-kill

MySQL Performance Blog - Wed, 19/11/2014 - 3:18pm

You might have encountered situations where you had to kill some specific select queries that were running for long periods and choking the database. This post will go into more detail with an example of report query offloading. Report query (select) offloading to a slave server is a common practice to reduce the workload of the […]

Avoiding MySQL ALTER table downtime

MySQL Performance Blog - Tue, 18/11/2014 - 5:50pm

MySQL table alterations can interrupt production traffic causing bad customer experience or in worst cases, loss of revenue. Not all DBAs, developers, syadmins know MySQL well enough to avoid this pitfall. DBAs usually encounter these kinds of production interruptions when working with upgrade scripts that touch both application and database or if an inexperienced admin/dev […]

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

MySQL Performance Blog - Tue, 18/11/2014 - 1:00pm

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 […]

Percona Toolkit 2.2.12 is now available

MySQL Performance Blog - Mon, 17/11/2014 - 6:44pm

Percona is pleased to announce the availability of Percona Toolkit 2.2.12.  Released on November 14, Percona Toolkit is a collection of advanced command-line tools to perform a variety of MySQL server and system tasks that are too difficult or complex for DBAs to perform manually. Percona Toolkit, like all Percona software, is free and open source. This release is […]

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