We are pleased to announce the immediate availability of MariaDB 5.5.20-alpha. MariaDB 5.5.20 is the first Alpha release in the 5.5 series. We hope to follow it up soon with a beta 5.5 release.
MariaDB 5.5.20-alpha is a merge of MariaDB 5.3 and MySQL 5.5 with some limited additional bug fixes. This is the first 5.5-based release, and we are releasing it now, intentionally without any extra features (and with it missing some planned features) to get it into the hands of any who might want to test it. Extra features planned for MariaDB 5.5 will be pushed into future releases.
As with any alpha release, MariaDB 5.5.20-alpha should not be used on production systems.
The Release Notes page has some notes on the release. There is also a Changelog available for those who are interested.
Last weekend Vadim from Percona published his MariaDB 5.3.4 benchmark results. As the new benchmark guy at Monty Program I take this oportunity to add some more results of my own.
One question in the comments to Vadim was if it is fair to compare MariaDB-5.3 with MySQL-5.5. Or if this comparison should be done with MySQL-5.1. The answer is: it does not matter much. MySQL-5.5 and MySQL-5.1 show very similar results in the Sysbench OLTP benchmark.
So I created a Sysbench environment pretty much like Vadims and tested the following versions of the MySQL Server:
MariaDB-5.3.4 – the Monty Program release candidate, both with XtraDB and the InnoDB plugin
Percona-Server 5.1.61 because it is based on the same XtraDB version as MariaDB-5.3
Percona-Server 5.5.20 – the current Percona flagship
MySQL-5.5.20 – the current Oracle flagship
Indeed MariaDB-5.3.4 scales significantly worse than MySQL-5.5.20. However Percona-Server 5.1.61 behaves nearly identical and Percona-Server 5.5.20 is only slightly better. If we run MariaDB-5.3.4 with the InnoDB plugin instead of the default XtraDB, then MariaDB outperforms Percona-Server 5.5.20.
As a consequence, we will deliver the InnoDB plugin with future binary releases of MariaDB. MySQL-5.1.61 with the InnoDB plugin (not shown in the graph) is between MariaDB-5.3.4(InnoDB-plugin) and MySQL-5.5.20. We are currently investigating why MySQL-5.1 is faster than MariaDB-5.3, even with the same storage engine.
Please keep in mind that Sysbench is a highly synthetical benchmark. Real world workload will probably yield different results. Also this benchmark used solid state disks. A storage system with spinning disks might saturate much earlier and would then flatten out the peaks.
If I should draw a conclusion, then I would say that for highest concurrency levels you should go for MySQL-5.5. Or wait for MariaDB-5.5
Benchmark details: sysbench OLTP multi-table. 16 tables with 250K rows each. 20G InnoDB buffer pool. Data and logs on SSD. Dual socket hexacore Xeon with HT enabled (24 logical cores). You can download the tarball with benchmark scripts, config and raw results.
The laptop I’m using had MySQL 5.1.55 installed with one database (apart from the system database). Installing MariaDB does not impact existing data in any way and once the install completed I had instant access to my data.
As part of the install you are given the option to set a new password for the root user. I choose to do it in the video, but you don’t need to. If you leave the password field blank the root password will not be changed. Other database users are preserved, of course.
As with any database upgrade, before doing this to a production system you should have backups and test.