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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 CENTOS

mysqld

MYSQLD(8)						       MySQL Database System							 MYSQLD(8)

NAME

       mysqld - the MySQL server

SYNOPSIS

       mysqld [options]

DESCRIPTION

       mysqld, also known as MySQL Server, is the main program that does most of the work in a MySQL installation. MySQL Server manages access to
       the MySQL data directory that contains databases and tables. The data directory is also the default location for other information such as
       log files and status files.

       When MySQL server starts, it listens for network connections from client programs and manages access to databases on behalf of those
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       The mysqld program has many options that can be specified at startup. For a complete list of options, run this command:

	   shell> mysqld --verbose --help

       MySQL Server also has a set of system variables that affect its operation as it runs. System variables can be set at server startup, and
       many of them can be changed at runtime to effect dynamic server reconfiguration. MySQL Server also has a set of status variables that
       provide information about its operation. You can monitor these status variables to access runtime performance characteristics.

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COPYRIGHT

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SEE ALSO

       For more information, please refer to the MySQL Reference Manual, which may already be installed locally and which is also available online
       at http://dev.mysql.com/doc/.

AUTHOR

       Sun Microsystems, Inc. (http://www.mysql.com/).

MySQL 5.1							    04/06/2010								 MYSQLD(8)
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