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- MySQL 5.4 Reference Manual
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This section describes the general MySQL development roadmap, provides an overview about features that have been implemented in previous series and that are new in MySQL 5.4, the release series covered in this manual. The maturity level this release series is beta. Information about maturity levels can be found in Section 2.1.2.1, “Choosing Which Version of MySQL to Install”.
Before upgrading from one release series to the next, please see the notes in Section 2.12.1, “Upgrading MySQL”.
The most requested features and the versions in which they were implemented or are scheduled for implementation are summarized in the following table.
| Feature | MySQL Series |
| Unions | 4.0 |
| Subqueries | 4.1 |
| R-trees | 4.1 (for the MyISAM storage engine) |
| Stored procedures and functions | 5.0 |
| Views | 5.0 |
| Cursors | 5.0 |
| XA transactions | 5.0 |
| Triggers | 5.0 and 5.1 |
| Event scheduler | 5.1 |
| Partitioning | 5.1 |
| Pluggable storage engine API | 5.1 |
| Plugin API | 5.1 |
| Row-based replication | 5.1 |
| Server log tables | 5.1 |
| Scalability and performance improvements | 5.4 |
| DTrace support | 5.4 |
| Foreign keys | 6.x (implemented in 3.23 for InnoDB) |
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