Joseph, I've noticed this as well. MySQL seems to do most types of queries extremely well, but CERTAIN joins are very slow. I ended up having to denormalize my data structures somewhat in order to maintain good performance with MySQL. What I don't know, since I do not have access to a Linux box, is whether the problem is OS related. In any case, I found that I couldn't create data structures in the same way as on MSSQL.
HTH, Dan Cumpian -----Original Message----- From: Joseph Dietz [mailto:[EMAIL PROTECTED]] Sent: Wednesday, December 18, 2002 1:40 PM To: [EMAIL PROTECTED] Subject: Severe performace problem linking tables with mysql PLATFORM: 3.23.52-max-nt with Windows 2000 professional (default table type) I have discovered a performace issue when joining several tables together. The performance is extremely poor when performing select queries using the WHERE clause and joining the tables with the pk_media_id = fk_media_id etc... I guess this is what people might think about when considering using mysql. With SQL 2000 Windows Server, and ACCESS, there was no loss in performace. 4 of my tables are cross reference tables as such: pk=primary key, fk= foreign key Medias MediaAuthors Authors pk_media_id ---- fk_media_id, fk_author_id ---- pk_author_id (Many authors for each media) _________________________________________________________________ MSN 8 helps eliminate e-mail viruses. Get 2 months FREE*. http://join.msn.com/?page=features/virus --------------------------------------------------------------------- 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 --------------------------------------------------------------------- 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
