TMySQL is based on MySQL 5.5.24, developed by Tencent's DBA team. TMySQL 1.0 (2012-09-25) 1. Add new InnoDB row_format GCS, which is default in TMySQL. 2. Based on GCS row format, table in InnoDB support online adding columns, which only need to modify meta data. Bug fixed: 1. log-warnings does not work in session level http://bugs.mysql.com/bug.php?id=66953 2. Insertion of an out-of-range value into a partitioned table was not handled correctly in all cases. This is a regression that first appeared in MySQL 5.5.23. (Bug #14005441, Bug #65587) http://bugs.mysql.com/bug.php?id=65587 TMySQL 1.1 (2012-12-07) 1. InnoDB partitioned table support online adding columns. 2. Optimize the memory usage of innnodb's dictionary. Bug fixed: 1. GBK charset is not Fully supported in mysql http://bugs.mysql.com/bug.php?id=67739 2. overflow caused replication sql thread failed to execute events https://bugs.launchpad.net/percona-server/+bug/1070255