From: "Terry Spencer" > An index exists on all three columns referred to, in addition to a > combination of del and signoff. > > The indexes are listed as possible keys, but none used by the query; key = > null. Can anyone suggest why? How can I optimise this?
How many records are there in the table? If MySQL's query optimizer thinks that the query will return more than approx. 30% of the records it is probably faster to do a tablescan than to use the index and access the records one by one. Regards, Jigal. -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
