MySQL performing too badly under heavy load - urgent hlp needed
Hello all, Stuck up with a major problem. Urgent hlp required MySQL seems to be performing too bad during heavy load on the server. Queries which normally take around 5 secs to complete are taking more than 1000 secs to complete during load. What could be the reason. Show processlist shows many process in sending data state. All tables are of INNODB type. But we are not running any transactions as yet. The server is clogged due to many httpd requests (150 Max). All the httpd requests are in W state ( means sending response ). What could be causing this. Is it MySQL or is it Apache... Any suggestions would help... Thanks, Ratheesh K J
Re: MySQL performing too badly under heavy load - urgent hlp needed
I doubt apache is to blame. 5 seconds for a query on a website is extremely slow, so if that is your normal results, then you have a problem there already. I've been building database driven websites for around 11 years and i don't think i can remember a single time i went into production with a single query that was slower than 0.1 second, unless it was something very rarely used for administration purposes. From the top of my head i'd say your problem is either a) poor datamodel design which forces slow queries b) poor usage of indexes in the database (use explain to check) c) non-optimized configuration of the server (have you tuned the server parameters to the way you use the server?) d) insufficient hardware for your needs e) any combination of the above Ratheesh K J wrote: Hello all, Stuck up with a major problem. Urgent hlp required MySQL seems to be performing too bad during heavy load on the server. Queries which normally take around 5 secs to complete are taking more than 1000 secs to complete during load. What could be the reason. Show processlist shows many process in sending data state. All tables are of INNODB type. But we are not running any transactions as yet. The server is clogged due to many httpd requests (150 Max). All the httpd requests are in W state ( means sending response ). What could be causing this. Is it MySQL or is it Apache... Any suggestions would help... Thanks, Ratheesh K J -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: MySQL performing too badly under heavy load - urgent hlp needed
At 09:38 AM 7/27/2006, Ratheesh K J wrote: Hello all, Stuck up with a major problem. Urgent hlp required MySQL seems to be performing too bad during heavy load on the server. Queries which normally take around 5 secs to complete are taking more than 1000 secs to complete during load. What could be the reason. Show processlist shows many process in sending data state. All tables are of INNODB type. But we are not running any transactions as yet. The server is clogged due to many httpd requests (150 Max). All the httpd requests are in W state ( means sending response ). What could be causing this. Is it MySQL or is it Apache... Any suggestions would help... Thanks, Ratheesh K J So, what have you tried? Give us some information -- knowing which version you are running would be a good start. Are the queries slow if run from the command line? Are there enough threads in Apache? Have you rebuilt your indexes? Dropped them and replaced. Run optimize database? Done a dump and restore? Miles Thompson -- No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.1.394 / Virus Database: 268.10.4/401 - Release Date: 7/26/2006 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: MySQL performing too badly under heavy load - urgent hlp needed
On Thursday 27 July 2006 17:00, Martin Jespersen wrote: I doubt apache is to blame. 5 seconds for a query on a website is extremely slow, so if that is your normal results, then you have a problem there already. I've been building database driven websites for around 11 years and i don't think i can remember a single time i went into production with a single query that was slower than 0.1 second, unless it was something very rarely used for administration purposes. From the top of my head i'd say your problem is either a) poor datamodel design which forces slow queries b) poor usage of indexes in the database (use explain to check) c) non-optimized configuration of the server (have you tuned the server parameters to the way you use the server?) d) insufficient hardware for your needs e) any combination of the above f) not enough memory, that forces major swapping activity -Stathis Ratheesh K J wrote: Hello all, Stuck up with a major problem. Urgent hlp required MySQL seems to be performing too bad during heavy load on the server. Queries which normally take around 5 secs to complete are taking more than 1000 secs to complete during load. What could be the reason. Show processlist shows many process in sending data state. All tables are of INNODB type. But we are not running any transactions as yet. The server is clogged due to many httpd requests (150 Max). All the httpd requests are in W state ( means sending response ). What could be causing this. Is it MySQL or is it Apache... Any suggestions would help... Thanks, Ratheesh K J -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: MySQL performing too badly under heavy load - urgent hlp needed
Do a show status and check on what mysql is doing. I would start by looking at: threads_created - if this is high, increase your thread_cache_size. This means MySQL is busy creating and destroying threads instead of reusing them. This can take a toll on the OS. Opened_tables - if this number is high/climbing, MySQL is buys opening and closing tables, which means your table_cache is probably too low. Compare open_tables to table_cache, open_tables should be lower. Show variables will help you see your current settings. Some things can be changed on the fly, like the thread cache, so can can do some things without taking MySQL down. - Original Message - From: Ratheesh K J [EMAIL PROTECTED] To: mysql@lists.mysql.com Sent: Thursday, July 27, 2006 8:38 AM Subject: MySQL performing too badly under heavy load - urgent hlp needed Hello all, Stuck up with a major problem. Urgent hlp required MySQL seems to be performing too bad during heavy load on the server. Queries which normally take around 5 secs to complete are taking more than 1000 secs to complete during load. What could be the reason. Show processlist shows many process in sending data state. All tables are of INNODB type. But we are not running any transactions as yet. The server is clogged due to many httpd requests (150 Max). All the httpd requests are in W state ( means sending response ). What could be causing this. Is it MySQL or is it Apache... Any suggestions would help... Thanks, Ratheesh K J -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
