many thanks brothers Now, my query fastest again with limit 1, because query count(*) just result 1 row
=-hery-= ----- Original Message ----- From: "BD" <[EMAIL PROTECTED]> To: "Hery Yulianto" <[EMAIL PROTECTED]> Cc: <[EMAIL PROTECTED]> Sent: Monday, February 04, 2002 10:34 PM Subject: Re: How to index Optimization on 20 million record > Hery, > You need to get some idea of how many records are being counted. > What I suggest is to put a Limit on your select statement and gradually > increase it. > > For example > select count(*) from TABLE_1 where FIELD_1 = "XXX_CC" limit 10; > > If this takes too long, then you know right away there is something wrong > with the index. > If it is fast enough, then increase it to "Limit 1000" and test the time. > Then bump it up to 5000, 10000 etc. until you get an idea of how many rows > it is trying to count. Perhaps it there are 1 million rows with FIELD_1 = > "XXX_CC"? > > Brent > --------------------------------------------------------------------- Before posting, please check: http://www.mysql.com/manual.php (the manual) http://lists.mysql.com/ (the list archive) To request this thread, e-mail <[EMAIL PROTECTED]> To unsubscribe, e-mail <[EMAIL PROTECTED]> Trouble unsubscribing? Try: http://lists.mysql.com/php/unsubscribe.php
