Comments on: MyISAM Statistics Gathering

By: MySQL Back to Basics: Analyze, Check, Optimize, and Repair

MySQL Back to Basics: Analyze, Check, Optimize, and Repair — Fri, 25 Jul 2008 16:53:20 +0000

[...] my post about gathering index statistics, I referred to OPTIMIZE TABLE, ANALYZE TABLE, and REPAIR TABLE — but I never explained in [...]

By: Sergei Golubchik

Sergei Golubchik — Tue, 08 Jul 2008 12:07:03 +0000

Just to mention that while REPAIR TABLE and CHECK TABLE are “known to work with MyISAM” – where “work” here means “they update the statistics of the indexes” – they are not guaranteed to.

The manual does not say that REPAIR or CHECK update statistics. They do, because it comes at no cost during, say, repair. In other words, it’s an undocumented side-effect of the REPAIR. And it could change anytime.

By: Nicklas Westerlund

Nicklas Westerlund — Fri, 04 Jul 2008 20:46:04 +0000

Alex,

I can do a post with pointers on those different commands, thanks for the idea!

By: Alex Gorbachev

Alex Gorbachev — Fri, 04 Jul 2008 20:02:52 +0000

We all know how ANALYZE TABLE, REPAIR TABLE, and OPTIMIZE TABLE work with MyISAM.

I wouldn’t be so sure if I’d been you. ;-)
Some of us are DBA’s for non-MySQL databases by enjoy the read so if you have pointers on how it actually works would be great. Or we just stay tuned for it to come on the blog. Keep it up!