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In this blog post, I’d like to take a look at a few different things such as MySQL Group Replication, multi-instance MySQL setups on systemd and shell scripting the whole mess to make it easy to build, and easy to rebuild.  To be honest, it took a little help from Shinguz’s blog to get the… Read More »

Percona announces the release of Percona Server for MySQL 5.5.53-38.4 on November 23, 2016. Based on MySQL 5.5.53, including all the bug fixes in it, Percona Server for MySQL 5.5.53-38.5 is now the current stable release in the 5.5 series.

Percona Server for MySQL is open-source and free. You can find release details in the 5.5.53-38.5 milestone on Launchpad. Downloads are available here and from the Percona Software Repositories.

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Introduction I read a very interesting article by Krešimir Nesek regarding MySQL result set streaming when it comes to reducing memory usage. Mark Paluch, from Spring Data, asked if we could turn the MySQL result set streaming by default whenever we are using Query#stream or Query#scroll. That being said, the HHH-11260 issue was created, and … Continue reading How does MySQL result set streaming perform vs fetching the whole JDBC ResultSet at once →

In this blog I will provide answers to the questions and queries that some of you have raised during the webinar on Nov 17th.

I would like to say thank you to all of the audience who attended the talk on November 17, 2016. You can also check the recording and slides here.

Q. How is storage distribution done across the node?

A. Each node has independent storage and other resources. There is no sharing of resource. Only the write-sets are replicated.

Q. If write-set propagation fails in some manner is there any retry mechanism?

A. write-set are written to …

I just uploaded a quick tool that I think you will find useful if you need to consolidate, expand innodb databases if tablespaces are in use.

This golang application will copy an entire innodb database from one server to another server via scp.
innodb-tablespace-copy follows the algorithm described here. This golang application copies 4 tables in parallel after setting up the remote environment. Then in parallel import the tablespaces. I've only used this application on Percona XTRADB 5.6 but it should work for all flavors of innodb that are out there.

Note to recover from interruption, this is done manually either by discarding the tablespace or by dropping the remote database.

Feel free to add to it and make it better :)
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As you probably know MySQL is an Open Source product licensed under the GPL v2. The GPL grants you the right to not just read and understand the code of the product but also to use, modify AND redistribute the code as long as you follow the GPL rules.

This redistribution has happened in the past various times. But in the western hemisphere only 3 of these branches/forks of MySQL are of relevance for the majority of the MySQL users: Galera Cluster for MySQL, MariaDB (Server and Galera Cluster) and Percona Server (and XtraDB Cluster).

Now it happened …

In 8.0 we have introduced another bunch of parser refactoring worklogs:

• WL#8067 (me): “Refactoring of the CREATE TABLE statement” with its subtasks:
  • WL#8434: Refactoring of partitioning-related stuff.
  • WL#8435: Cleanup and refactoring column definition stuff.
  • WL#8433: Separate DD commands from regular SQL queries in the parser grammar.

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Apart from Oracle, MySQL and SQL Server are the most popular RDBMS in the software industry. Which database platform should you choose?

The post MySQL or SQL Server? appeared first on Datavail.

Join us on Tuesday, December 6th, for our last webinar of the year. Krzysztof Książek, Senior Support Engineer at Severalnines, will be sharing his top 9 tips on how to best build a production-ready MySQL Replication environment.

MySQL replication is a well known and proven solution for building distributed setups of databases, and it has gone through a total transformation with version 5.6 and more recently, 5.7. Although straight-forward to deploy, a production-ready setup requires a bit of planning and preparation. What does a good replication configuration look like? How do you ensure performance? What do you do when a topology is broken, and replication will not restart? How to perform schema changes?

So if you'd like to learn what is needed to build a stable environment using MySQL replication, this webinar is for you!

Top 9 Tips for building a stable MySQL Replication environment

Tuesday, December 6th …