Changed the default value of
innodb_flush_log_at_trx_commit from 0 to
1. If you have not specified it explicitly in your
my.cnf, and your application runs much
slower with this new release, it is because the value 1
causes a log flush to disk at each transaction commit.
Fixed a bug : InnoDB forgot to call pthread_mutex_destroy() when a table was dropped. That could cause memory leakage on FreeBSD and other non-Linux Unixes.
Fixed a bug : MySQL could erroneously return 'Empty set' if InnoDB estimated an index range size to 0 records though the range was not empty; MySQL also failed to do the next-key locking in the case of an empty index range.
Fixed a bug :
GROUP BY and
DISTINCT could treat NULL values inequal.
This is a translation of the MySQL Reference Manual that can be found at dev.mysql.com. The original Reference Manual is in English, and this translation is not necessarily as up to date as the English version.