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I have id, member_id, topic_id fields. Sometimes I use id, sometimes member_id and sometimes topic_id in WHERE clauses. Can I add Indexes to all of them? Will it make it slower? I am new to MYSQL optimization stuff, so thank you.
Unused indexes won’t make a SELECT slower, but each index you add will slow down INSERTs and UPDATEs.
The maximum number of indexes a MyISAM table can have is 64