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Full Discussion: MySQL optimization or why the server is worsened
Special Forums UNIX and Linux Applications MySQL optimization or why the server is worsened Post 302808691 by sergibondarenko on Friday 17th of May 2013 09:03:57 AM
Old 05-17-2013
MySQL optimization or why the server is worsened
Hello

Please advise me how can I optimize my MySQL server. Or advise which way to look. Maybe someone had similar problems?

Over the past two weeks the MySQL server dropped 2 times. I began searching for ways to optimize the server.

Overall the picture like that:
There is a separate MySQL server (Debian), it stores the information for the call center built on top of the Asterisk open source IP PBX (separate server). Almost all information of the call center stored in the MySQL: call queues, agents, IVR values, CDR etc. The Asterisk constantly interacts with the MySQL server to get or to put info. Average number of phone calls for the system is about 70 calls simultaneously.

Recently I observed a delay of the redistribution of clients for a free call center agents. A delay was increased from 5 second up to 60 seconds and sometimes even more. I suspected InnoDB locks and transactions deadlocks. And then the MySQL server started falling.

In SHOW ENGINE INNODB STATUS\G I see a lot of locks and transactions that hang over 40 sec but I can not figure out hot to deal with them. And is it necessary?
Code:
2721452-*** (2) TRANSACTION:
2721453:TRANSACTION 0 1345044118, ACTIVE 45 sec, process no 23678, OS thread id 140176187664128 starting index read, thread declared inside InnoDB 0
2721454-mysql tables in use 1, locked 1
2721455-10 lock struct(s), heap size 3024, 7 row lock(s), undo log entries 2

Also in the output is a bunch of information but I do not know what conclusions could be made for those values. Please look and tell me what values are most suspicious on your point of view.
Complete log of half a month can be found in the file *show_engine_innodbAndProc_stat_10Apr2013

Peak CPU load by mysqld is quit high as can be seen from the graphs. Memory and disk are not heavily loaded. See all the graphics in *graphs
The list of MySQL tables and their engines can be seen in *mysql_engines
MySQL global variables in *mysqlGvars.txt
The MySQL server hardware settings in *phys_mysql_server

*All files can be downloaded by the link rapidshare.com/files/3386491301/alldata.zip
Last edited by radoulov; 05-17-2013 at 04:55 PM..
 

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LEARN ABOUT SUSE

apache::session::lock::mysql

Session::Lock::MySQL(3) 				User Contributed Perl Documentation				   Session::Lock::MySQL(3)

NAME

       Apache::Session::Lock::MySQL - Provides mutual exclusion using MySQL

SYNOPSIS

	use Apache::Session::Lock::MySQL;

	my $locker = Apache::Session::Lock::MySQL->new();

	$locker->acquire_read_lock($ref);
	$locker->acquire_write_lock($ref);
	$locker->release_read_lock($ref);
	$locker->release_write_lock($ref);
	$locker->release_all_locks($ref);

DESCRIPTION

       Apache::Session::Lock::MySQL fulfills the locking interface of Apache::Session.	Mutual exclusion is achieved through the use of MySQL's
       GET_LOCK and RELEASE_LOCK functions.  MySQL does not support the notion of read and write locks, so this module only supports exclusive
       locks.  When you request a shared read lock, it is instead promoted to an exclusive write lock.

CONFIGURATION

       The module must know how to connect to your MySQL database to acquire locks.  You must provide a datasource name, a user name, and a
       password.  These options are passed in the usual Apache::Session style, and are very similar to the options for
       Apache::Session::Store::MySQL.  Example:

	tie %hash, 'Apache::Session::MySQL', $id, {
	    LockDataSource => 'dbi:mysql:database',
	    LockUserName   => 'database_user',
	    LockPassword   => 'K00l'
	};

       Instead, you may pass in an already opened DBI handle to your database.

	tie %hash, 'Apache::Session::MySQL', $id, {
	    LockHandle => $dbh
	};

AUTHOR

       This module was written by Jeffrey William Baker <jwbaker@acm.org>.

SEE ALSO

       Apache::Session

perl v5.12.1							    2008-01-08						   Session::Lock::MySQL(3)
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