id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
8977	Database schema upgrades can be inefficient with lots of database tables because of maybe_create_table() function	jamescollins		"The {{{maybe_create_table()}}} function in {{{wp-admin/includes/upgrade.php}}} performs a {{{SHOW TABLES}}} query (which returns every table in the database) then loops over all of these to see if a the specified table exists.

WPMU was recently modified to optimise this, and donncha has suggested that this fix be implemented in WP as well.

(See [http://trac.mu.wordpress.org/ticket/833 WPMU Trac Ticket #833] for more information)"	defect (bug)	closed	normal	2.8	Upgrade/Install	2.7	normal	fixed