Based on MySQL 5.5.14, including all the bug fixes in it, Percona Server 5.5.14-20.5 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 5.5.14-20.5 milestone at Launchpad.
fsync()has been replaced with
fdatasync()to improve perfomance where possible. The former is intended to sync the metadata of the file also (size, name, access time, etc.), but for the transaction log and the doublewrite buffer, such sync of metadata isn’t needed. Bug Fixed: #803270 (Yasufumi Kinoshita).
Two new collations,
ucs2_general50_ci, have been to improve compatibility for those upgrading from MySQL 5.0 or 5.1 prior to version 5.1.24.
A fix for a MySQL bug (#27877) introduced an incompatible change in collations in MySQL 5.1.24. If the following collations were used:
and any of the indexes contained the German letter “U+00DF SHARP S” ‘ß’ (which became equal to ‘s’), when upgrading from 5.0 / 5.1.23 or lower:
This problem is avoided when upgrading to Percona Server by converting the affected tables or columns to the collations introduced:
Blueprint:utf8-general50-ci-5.5 (Alexey Kopytov).
global_temporary_tablescaused the server to crash in some scenarios due to insufficient locking. Fixed by introducing a new mutex to protect from race conditions. Bugs Fixed:#745241 (Alexey Kopytov).
innodb_lazy_drop_tableoption led to an assertion error when truncating a table in some scenarios. Bug Fixed:#798371 (Yasufumi Kinoshita).
For more information, please see the following links: