I think increasing memory and giving more memory to MySQL would help.
Nilesh -----Original Message----- From: Jared Richardson [mailto:[EMAIL PROTECTED]] Sent: Tuesday, June 11, 2002 1:48 PM To: Stefan Hinz; [EMAIL PROTECTED] Subject: Re: mysqld refusing connections while getting sloooow We've seen very similar behavior when there are very long SQL queries being run that are disk intensive.. generally speaking, something is having to traverse the table (or a temp table) line by line. If he has any logging capability, see long each SQL query is taking to return to his app then clean up the "bad" ones. Also, look at faster disks... 7,200 rpm, bigger internal caches (some disks have 8 meg!), small raids are inexpensive, and you can put different tables on different physical disks to speed access. Oh yeah, with MySql, you can put all the temp tables on a different disk. We found this to make an amazing difference! Also, a P4 or an Athlon system is a great deal faster than your friend's system... the faster bus speeds on those architectures will again make a huge difference. We buy dual Athlons with a gig of ram for about 2 thousand dollars. ----- Original Message ----- From: "Stefan Hinz" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Tuesday, June 11, 2002 12:30 PM Subject: mysqld refusing connections while getting sloooow | Dear list, | | a friend of mine asked for assistance on the following problem (which I | cannot solve myself): | | He has a mysqld 3.23.38 running on Linux, with 2 cpus (400 MHz celeron) | and 512 MB ram. mysqld runs as a production server, with some | applications running about 80 queries per second. There are about 20 | concurrent connections per hour. He uses myisam tables, no innodb or | something. | | Quite often he finds that new clients (apps) cannot connect to mysqld, | the connection is refused. My friend tried to connect from localhost to | mysqld once when this happened, trying to log in as admin. Even for him, | the connection was refused by mysqld (although mysqld is supposed to | keep one connection open for the admin, in any case). To be correct | about this, mysqld didn't respond at all, for 5 minutes. | | When connections for new users (apps) are blocked by mysqld, he finds | that response times will slow down by factor 20, for users that are | connected at this time. Also, he finds that Linux will kill mysqld | *sometimes* (the server is re-started automatically). | | I did not find anything unusual using mysqladmin extended-status or | mysqladmin variables. In my.cnf however, I found something strange: | | [mysqld] | ... | skip-locking | set-variable = key_buffer=256M | set-variable = max_allowed_packet=1M | set-variable = table_cache=256 | set-variable = sort_buffer=1M | set-variable = record_buffer=1M | set-variable = myisam_sort_buffer_size=64M | set-variable = thread_cache=8 | # Try number of CPU's*2 for thread_concurrency | set-variable = thread_concurrency=8 | log-bin | server-id = 1 | | If I count these buffers and caches, this will add up to > 320 MB plus | the table cache. Could this be the cause of the problem, when my friend | only has 512 MB of RAM on the machine? | | Any help is greatly appreciated. | | Regards, | -- | Stefan Hinz <[EMAIL PROTECTED]> | Geschäftsführer / CEO iConnect GmbH <http://iConnect.de> | Heesestr. 6, 12169 Berlin (Germany) | Tel: +49 30 7970948-0 Fax: +49 30 7970948-3 | | | --------------------------------------------------------------------- | 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 --------------------------------------------------------------------- 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
