> In this instance would you create four indexes key(a) key(b) key(a,b) key > (b,a) ? Or is the decision based on the query response time ?
Depends on the data and usage, but probably I'd go for a index(a,b) & index(b,a) if reads heavily outnumber writes. As index(a) is covered by index(a,b), and index(b) by index(b,a), we don't need to add those, which saves time on modifications. -- Rik Wasmus -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/mysql?unsub=arch...@jab.org
