MySQL Development History

The most requested features and the versions in which they were implemented are summarized in the following table.

FeatureMySQL SeriesUnions4.0Subqueries4.1R-trees4.1 (for the MyISAM storage engine)Stored procedures and functions5.0Views5.0Cursors5.0XA transactions5.0Triggers5.0 and 5.1Event scheduler5.1Partitioning5.1Pluggable storage engine API5.1Plugin API5.1InnoDB Plugin5.1Row-based replication5.1Server log tables5.1Scalability and performance improvements5.1 (with InnoDB Plugin)DTrace support5.5InnoDB as default storage engine5.5Semisynchronous replication5.5SIGNAL/RESIGNAL support in stored routines5.5Performance Schema5.5Supplementary Unicode characters5.5