It felt like the right time for us to look back at some useful commands for table maintenance that some of us may not have mastered as much as we might like to think.In my post about gathering index statistics, I referred to "OPTIMIZE TABLE", "ANALYZE TABLE", and "REPAIR TABLE" -- but I never explained in depth what the different commands do, and what the differences between them are. That is what I thought I would do with this post, focusing on InnoDB and MyISAM, and the differences in how they treat those commands. I will also look at different cases and see which one is right for in each case.