Corin,
Thursday, October 17, 2002, 3:09:08 PM, you wrote:
CL> i have the following problem. I have a table wherey to_id
CL> and owner_id are of type unsigned int not null and both
CL> are normal indexes. Unluckily a query like:
CL> ------
CL> EXPLAIN SELECT * FROM `telegramme` WHERE to_id = 3157 or owner_id = 3157
CL> ------
CL> returns very bad results:
CL> ------
CL> table type possible_keys key key_len ref rows Extra
CL> telegramme ALL to_id,owner_id NULL NULL NULL 11488 where used
CL> ------
CL> how could this be optimized or is this a bug of mysql, because the
CL> indexes exist but are not used (even if specified with use index(..)) ?!
How many rows there are in table `telegramme`? When MySQL needs to access to more
that 30% records in the table, it doesn't use an index:
http://www.mysql.com/doc/en/MySQL_indexes.html
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