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This is a bugfix release for the MySQL 4.0 release family.
This section documents all changes and bug fixes that have been applied since the last official MySQL release. If you would like to receive more fine-grained and personalized update alerts about fixes that are relevant to the version and features you use, please consider subscribing to MySQL Enterprise (a commercial MySQL offering). For more details, please see (http://www.mysql.com/products/enterprise).
InnoDB exhibited thread thrashing with more than 50 concurrent connections under an update-intensive workload. (Bug #22868)
InnoDB showed substandard performance with multiple queries running concurrently. (Bug #15815)
User-defined variables could consume excess memory, leading to a crash caused by the exhaustion of resources available to the
MEMORY storage engine, due to the fact that this engine is used by MySQL for variable storage and intermediate results of
GROUP BY queries. Where
SET had been used, such a condition could instead give rise to the misleading error message You may only use constant expressions with SET, rather than Out of memory (Needed NNNNNN bytes). (Bug #23443)