A new MySQL Milestone Release (5.5.0-M2) has been published

Following our new Milestone-based release model, we've now published MySQL 5.5.0-M2. Please see the "What's New in MySQL 5.5" section of the reference manual for a summary of the most notable changes. The MySQL 5.5.0 Changelog provides a much more detailed list of changes, bug fixes and improvements.

Highlights in this release include:

The InnoDB plugin (currently at version 1.0.5) replaces the built-in InnoDB storage engine. This version includes a number of important performance improvements, especially when running on multi-core CPUs with many concurrent transactions.

Support for "semisynchronous" replication. This is a very useful feature to check out, if you use MySQL replication in a high-availability scenario and you want to ensure that at least one replication slave has received the latest transaction that was committed on the master. The master waits for confirmation from the slave after a commit before it returns control to the application. See the chapter "Semisynchronous replication" in the reference manual for more details. Mark Callaghan and Giuseppe Maxia also provide some more background information about this feature in their blog posts.

You can now use SIGNAL and RESIGNAL statements in stored routines and triggers, as defined by the SQL standard. These statements can be used to raise an error inside of your routines and can define appropriate actions, e.g. displaying an error message or issuing warnings. Check out the reference manual or take a look at Roland Bouman's blog post that provides a quick overview by giving a practical example.

The table partitioning functionality that was introduced with MySQL 5.1 received a large number of bug fixes and improvements. For example, you can now use two new types of user-defined partitioning: RANGE COLUMNS and LIST COLUMNS, providing more flexibility when it comes to defining how a table should be partitioned (e.g. by defining ranges or lists based on DATE, DATETIME or strings). Ranges based on multiple columns are now possible, too. For more information, please see the chapters "RANGE Partitioning", and "LIST Partitioning" in the reference manual.

Other improvements include new LOAD XML statement, which allows you to read data from an XML file into a table, a new TO_SECONDS() date function to calculate the number of seconds since the year zero and a ton of bug fixes.

Binary packages and sources are now available from the MySQL 5.5 download pages. The Bazaar source tree of this milestone release is available on Launchpad, too, in case you want to take a closer look at the ongoing development work in this branch. So please download and toy around with this release – we are looking forward to your feedback!

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