Percona is glad to announce the release of Percona Server 5.6.25-73.0 on July 1, 2015. Download the latest version from the Percona web site or from the Percona Software Repositories.

Based on MySQL 5.6.25, including all the bug fixes in it, Percona Server 5.6.25-73.0 is the current GA release in the Percona Server 5.6 series. Percona Server is open-source and free – and …

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 different memory limits. I have physical servers with the usually high amount of memory (128GB or more), but I am interested to see how a database server will perform, say if only 16GB of memory is available.

And while InnoDB usually respects the setting of innodb_buffer_pool_size in O_DIRECT mode (OS cache is not being used in this case), more engines (TokuDB for MySQL, MMAP, WiredTiger, RocksDB for MongoDB) usually get benefits from OS cache, and Linux kernel by default is generous enough to allocate as much memory as available. There I should note that while TokuDB (and TokuMX for MongoDB) supports DIRECT mode (that is bypass OS cache), we found there is a performance gain if OS cache is used for compressed pages.

It’s important to monitor the (database) backups after you set-it-up. In this post we will answer a few how to monitor MySQL Database backups solutions – monitoring methods. We should…

The post How to monitor MySQL backups first appeared on Change Is Inevitable.

Recently a friend asked about Installing Percona Monitoring Tools for Nagios as he was facing a few issues. I managed to set-it-up on my ubuntu VM. Sharing the the work-log…

The post Install Percona Monitoring Tools for Nagios – MySQL Plugins first appeared on Change Is Inevitable.

Like any good, thus lazy, engineer I don’t like to start things manually. Creating directories, configuration files, specify paths, ports via command line is too boring. I wrote already how I survive in case when I need to start MySQL server (here). There is also the MySQL Sandbox which can be used for the same purpose.

But what to do if you want to start Percona XtraDB Cluster this way? Fortunately we, at Percona, have engineers who created automation solution for starting PXC. This solution uses Docker. To explore it you need:

1. Clone the pxc-docker repository:
   git clone https://github.com/percona/pxc-docker …

MariaDB 5.5.44 was recently released (it is the latest MariaDB 5.5), and is available for download here:

https://downloads.mariadb.org/mariadb/5.5.44/

This is a maintenance release, and no major changes, so there are only several noteworthy items (but one of those being a security fix and five potential crashing bug):

• Security Fix: Client command line option –ssl-verify-server-cert (and MYSQL_OPT_SSL_VERIFY_SERVER_CERT option of the client API) when used together with –ssl will ensure that the established connection is SSL-encrypted and the MariaDB server has a valid certificate. This fixes CVE-2015-3152.
• Crashing Bug: mysql_upgrade crashes the server with REPAIR VIEW ( …

MariaDB 10.1.5 was recently released, and is available for download here:

https://downloads.mariadb.org/mariadb/10.1.5/

This is the 3rd beta, and 6th overall, release of MariaDB 10.1. There were not many major changes in this release, but a few notable items, as well as many overall bugs fixed (I counted 306).

Since it’s beta, I’ll only cover the major changes and additions, and omit covering general bug fixes (feel free to browse them all here).

To me, these are the highlights:

• New status variables: New status variables Binlog_group_commit_trigger_count, …

Applications often become impacted by MySQL performance. Optimization is the obvious solution but where to start? Join me on July 2 at 11 a.m. Pacific and I’ll show you how to optimize MySQL in a practical way – spending time on what gives you the best return. Many of you have heard me talk on this topic before and this updated presentation will get you up to speed on the latest areas to consider when improving MySQL performance.

I’ll be pointing out the most important things you need to get right for each of the following:

• Hardware
• MySQL Configuration
• Schema and Queries
• Application Architecture

I’ll also share some tools and techniques to focus on the queries most important for your application. At the end of this webinar, aptly titled “ …

The MySQL 5.7.6 release notes describe a change to the binary log group commit algorithm that can improve the performance of write intensive applications when the binary log is enabled (noted with Bug #19424075).  This change is probably inspired by the experiment reported in MySQL bug #73202.

There is a long history of tweaking the binary log group commit algorithm and the InnoDB storage engine to scale performance.  Mark Callaghan describes the work done on this problem at Facebook. …

MySQL Cluster: El ‘qué’ y el ‘cómo’.

Para aquellos que encuentran mucho sobre MySQL en Inglés pero poco en Español: mi pequeña aportación.
En el enlace tenéis información sobre qué es MySQL Cluster y cómo funciona. Incluso con ejemplos técnicos para romper las barreras y ayudar a simplificarlo (espero).

¡A disfrutar!