What does the table DDL look like. Is the table a fixed or dynamic format? -----Original Message----- From: Dan Wright [mailto:[EMAIL PROTECTED] Sent: Thursday, March 27, 2003 11:08 AM To: [EMAIL PROTECTED] Subject: Slow Inserts
I've been having trouble with some large tables getting what seems to be corrupted. Here's the situation: I have several tables that have 3 million to as much as 7 million records. I have a process that I run against those tables that pulls out a record based on specific criteria (select id,name from table where name !='' and status=0) does something in Perl and then changes the record it just pulled to a status of 9. So basically - every time I run this process, every records is scanned and many (90%) are changed to the status of 9. Well - on a newly imported list, it screams through that and I can get upwards of 3 million per second. Each time I run the process, it gets slower, however. I've used myisamchk and optimize table and neither seem to have any affect on the performance. The only thing that seems to work is mysqldumping the whole table, dropping the table and reimporting the table. I've read up on the site and have found a lot about what could be causing this and have tried many things. Now that I've found what's wrong and how to fix it, I'm happy, but I'd rather not have to dump and reimport. I'm running MySQL 4.0.11 on RHL 7.2. I'm using the "huge" my.cnf file with some minor tweaks. The tables I'm speaking of have no indexes in it. They had them, but I dumped them and that gave me a huge insert performance gain, but I'm still seeing slowdowns the more I run the process on the file. Thanks in advance, Dan -- 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]
