When should database indexes be rebuilt?

Question

I was reading about refactoring a large slow SQL Query over here, and the current highest response is from Mitch Wheat, who wants to make sure the query uses indexes for the

Answer 1

The answer you linked to about "regular maintenance" was in the specific context of a temporary table that gets truncated and repopulated regularly. You don't need to do this to the vast majority of MySQL database installs.