Fixed a bug in FIND_IN_SET() when the first argument was NULL.

Added table locks to Berkeley DB.

Fixed a bug with LEFT JOIN and ORDER BY where the first table had only one matching row.

Added 4 sample my.cnf example files in the support-files directory.

Fixed duplicated key problem when doing big GROUP BY operations. (This bug was probably introduced in 3.23.15.)

Changed syntax for INNER JOIN to match standard SQL.

Added NATURAL JOIN syntax.

A lot of fixes in the BDB interface.

Added handling of --no-defaults and --defaults-file to safe_mysqld.sh and mysql_install_db.sh.

Fixed bug in reading compressed tables with many threads.

Fixed that USE INDEX works with PRIMARY keys.

Added BEGIN statement to start a transaction in autocommit mode.

Added support for symbolic links for Windows.

Changed protocol to let client know if the server is in autocommit mode and if there is a pending transaction. If there is a pending transaction, the client library gives an error before reconnecting to the server to let the client know that the server did a rollback. The protocol is still backward-compatible with old clients.

KILL now works on a thread that is locked on a 'write' to a dead client.

Fixed memory leak in the replication slave thread.

Added new log-slave-updates option to mysqld, to allow daisy-chaining the slaves.

Fixed compile error on FreeBSD and other systems where pthread_t is not the same as int.

Fixed master shutdown aborting the slave thread.

Fixed a race condition in INSERT DELAYED code when doing ALTER TABLE.

Added deadlock detection sanity checks to INSERT DELAYED.