Based on MySQL 5.5.21, including all the bug fixes in it, Percona Server 5.5.21-25.1 is now the current stable release in the 5.5 series. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.5.21-25.1 milestone at Launchpad.
We are doing another release based on MySQL 5.5.21 as we have a couple of important bug fixes that we wish to make available.
Full release notes are available in the documentation.
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