well, I have a query with 6 or 7 tables and some of them have more than 130,000 records, plus 2 inner joins and 3 left joins and a variable condition, but still is fast!!! BUT I limit the output to about 30 records ( to fit in a screen ). make sure to have index on the link key.
----- Original Message ----- From: "John Almberg" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, September 23, 2003 12:37 PM Subject: speeding up a search > I am trying to find records (from the 'stamps' table) that are NOT > related to records in the 'links' table. To do this, I'm using a left > join. For example: > > select s.*, l.item_id as lid from stamps as s left join links as l on (( > s.item_id=l.item_id)) WHERE (s.sold is null); > > This worked great when there were just a few records in each table, but > now that there are about 4000 records in each table, this simple query > has slowed down to a crawl. It currently takes about 2 minutes to > execute on a linux machine. Not good enough, especially since there will > ultimately be at least 10,000 records in each table. > > Is there a better technique for doing this kind of search? Any > suggestions much appreciated. > > Brgds: John > > -- > Identry, LLC > Northport, NY 11768 > > Ph: 631.754.8440 > Fx: 631.980.4262 > Em: [EMAIL PROTECTED] > > Member: ASDA, APS, ANA, Long Island Web Developers Guild > > <><><><><><><><><><><><><><><><><><><><><><><><> > Visit us at: www.identry.com > Take control of your Web site > <><><><><><><><><><><><><><><><><><><><><><><><> > > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
