In the last episode (Mar 26), Daevid Vincent said: > Aside from the incredibly annoying fact that InnoDB tables don't store a > total COUNT(), my question is... Why are these numbers different? I could > easily parse out the second query which is REDICULOUSLY faster. BTW, why > doesn't mySQL just 'alias' the first query behind the scenes for us and > parse out the count?
SHOW TABLE STATUS simply returns a guess based on some index dives on InnoDB tables, and will actually change every time you run the command as it randomly picks different parts of the index to examine. http://dev.mysql.com/doc/refman/5.0/en/show-table-status.html : Rows The number of rows. Some storage engines, such as MyISAM, store the exact count. For other storage engines, such as InnoDB, this value is an approximation, and may vary from the actual value by as much as 40 to 50%. In such cases, use SELECT COUNT(*) to obtain an accurate count. -- Dan Nelson [EMAIL PROTECTED] -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
