Re: very strange performance issue

2009-06-27 Thread Chris Kantarjiev
Andrew Carlson said: > > I know this is basic, but check that you recreated the indexes after you > reloaded the snapshot. That has bit me before. I used myisamchk -r on the large table, and it has made a huge difference. I had used myisamchk before to check the table and got no complaints. M

Re: very strange performance issue

2009-06-27 Thread Chris Kantarjiev
Perhaps some clues here: I started taking the problem query apart to see what slows things down. I found a culprit, but I don't understand: mysql> select count(*) from Crumb where customer_id=380 and Actual_Time BETWEEN '2009-06-01 00:00' AND '2009-06-02 00:00' and ErrorCode = 0; +--+ | c

very strange performance issue

2009-06-27 Thread Chris Kantarjiev
I'm working in an environment where I have two similar servers, one running "production" the other for "development". They're not very dissimilar - both run 4.1.20-log, both run CentOS 4. The development server has a cut-down snapshot of the production database, and it's where we ... well, develop