We moved our RT server from mysql 4.0 to 5.1 and we are having some slow query issues on the Attachments table not finding the correct index
mysql> explain SELECT main.* FROM Attachments main WHERE (main.Parent = '308267') AND (main.ContentType = 'text/plain') ORDER BY main.id ASC; +----+-------------+-------+-------+----------------------------------+---------+---------+------+---------+-------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+-------+----------------------------------+---------+---------+------+---------+-------------+ | 1 | SIMPLE | main | index | Attachments3,Attachments4,Parent | PRIMARY | 4 | NULL | 1321158 | Using where | +----+-------------+-------+-------+----------------------------------+---------+---------+------+---------+-------------+ 1 row in set (0.00 sec) mysql> explain SELECT main.* FROM Attachments main FORCE INDEX(Attachments3) WHERE (main.Parent = '308267') AND (main.ContentType = 'text/plain') ORDER BY main.id ASC; +----+-------------+-------+------+---------------+--------------+---------+-------+------+-----------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+--------------+---------+-------+------+-----------------------------+ | 1 | SIMPLE | main | ref | Attachments3 | Attachments3 | 4 | const | 1 | Using where; Using filesort | +----+-------------+-------+------+---------------+--------------+---------+-------+------+-----------------------------+ 1 row in set (0.00 sec) It works if I choose to force the index. I have been trying to find where in the code this is to at least force the index but I have not found it.
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