Comments on: Quick wins with MySQL http://joyeur.com/2007/09/25/quick-wins-with-mysql/ Joyent's Weblog Sat, 11 Feb 2012 02:02:28 +0000 hourly 1 http://wordpress.com/ By: bboing http://joyeur.com/2007/09/25/quick-wins-with-mysql/#comment-2549 Wed, 26 Sep 2007 07:48:27 +0000 http://joycomad.joyent.us/blog/uncategorized/quick-wins-with-mysql/#comment-2549 Another good tip is to remember to use memcached or some disk cache on common queries

]]> By: Joe http://joyeur.com/2007/09/25/quick-wins-with-mysql/#comment-2548 Tue, 25 Sep 2007 23:47:00 +0000 http://joycomad.joyent.us/blog/uncategorized/quick-wins-with-mysql/#comment-2548 No postgresql love? :(

]]> By: Eli Dickinson http://joyeur.com/2007/09/25/quick-wins-with-mysql/#comment-2547 Tue, 25 Sep 2007 20:26:19 +0000 http://joycomad.joyent.us/blog/uncategorized/quick-wins-with-mysql/#comment-2547 Good advice! Thanks, Derek.

Another major (and oft overlooked) source of Created_tmp_disk_tables problems is queries for BLOB or TEXT fields.

If you have a complex query that requires a temporary table and you’re selecting a BLOB field, MySQL always creates the temp table on disk. Even if it’s small. Regardless of other settings.

(This was killing a high-volume Drupal set up until I tracked down the cause.)

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