Jeremy Cole wrote: -------------------------------------------- > === > Server version: 4.0.0-alpha-log > Threads: 408 Questions: 183163443 Slow queries: 4009 Opens: 43522 Flush > tables: 1 Open tables: 239 Queries per second avg: 222.828 > ===
Some free configuration advice: * You should increase your ``table_cache'' variable, ``Opens'' is much higher than ``Open_tables'' indicating that MySQL is having to close other tables in order to open some for new clients. -------------------------------------------- Its always good to recheck one's configuration. I took a look at our stats and noticed our opens were much higher than our open tables. But our table cache is set high enough (2500). Server version 3.23.44-log Protocol version 10 Connection Localhost via UNIX socket UNIX socket /tmp/mysql.sock Uptime: 8 hours 15 min 41 sec Threads: 63 Questions: 33231571 Slow queries: 52 Opens: 48114 Flush tables: 1 Open tables: 599 Queries per second avg: 1117.366 I wonder if opens counts temp tables (explicitly or implicitly created). Anyhow, in the above config, the high count of Threads may lead to an unstable machine particularly on Linux with large per thread caches (there is an equation in the MySQL manual somewhere for this). I'll bet he is using PHP and Apache and has persistent connection on PHP and Keep-Alive on Apache. The MySQL module for PHP is the biggest barrier to scaling in this situation. All database modules are bad in PHP, everyone knows it, very few have the time, resources, or money to fix things. [Case in point: if I had the money, I'd make the time...] There is SQL relay (http://www.firstworks.com/sqlrelay.html) though I have yet to try it. Has anyone? A quick (partial) fix is to use MM inside PHP so persistent connections act as expected (i.e. shared between processes). Even easier (sloppier) fix is to not use Keep-Alive, use persistent connections, but have the timeout inside mysql be a couple of seconds. That gets a better match between active http processes and mysql threads with the least bit of effort. Sincerely, Steven Roussey http://Network54.com/?pp=e --------------------------------------------------------------------- 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
