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Full Discussion: mysqldump slowing down the process?
Top Forums UNIX for Advanced & Expert Users mysqldump slowing down the process? Post 302305002 by DILEEP410 on Tuesday 7th of April 2009 05:58:34 PM
Old 04-07-2009
Java mysqldump slowing down the process?
Hi All,

I have a data calculation process-a perl script running each and every hour which will do some calculations on the data stored in a mysql server. Normally it tooks around 2minutes (max) to complete.

But in case if i did any actions on the linux box where the database is hosted, it is slowing down the process so as to finish the job in 30-50 minutes. I am just doing a mysqldump in the early hours of morning which is slowing down the very next process run. The process run is starting slowly but picking up it's speed and will finish up in it's own fashion, but overall 30-50 minutes it will consume.

I tried to do some optimization on the db server, moved the db server to a different box apart from where the perl script is running ie, loadserver but no change. I also noticed the io% consumed while the job is running and it is too high initially when the process start, then slows down gradually.

Here goes the version information:

Code:
MySQL:
        version    :   5.0.51a-24
        version_comment   :  (Debian)
        version_compile_machine :  i486
        version_compile_os  : debian-linux-gnu

Kernel version: 2.6.26-1-686 #1 SMP
Operating System: Debian 5.0 (lenny)

Can anyone face the similar scenario? Any ideas on this? Your help is very much appreciated!

With Regards
Dileep Pattayath
 

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LEARN ABOUT OPENSOLARIS

mysql_zap

zap(1)								  MySQL database							    zap(1)

NAME

       zap - a perl script used to kill processes

USAGE

       /usr/bin/mysql_zap [-signal] [-?Ift] pattern

SYNOPSIS

       zap [-I|-?]  [-f] [-t]

DESCRIPTION

       zap    supports by executing

       -I|-?  info

       -f     force

       -t     test

NOTE

       If  -f isn't given, ask user for confirmation for each process to kill. If signal isn't given, try first with signal 15 and after that with
       signal 9. If -t is given the processes is only shown on stdout.

SEE ALSO

       isamchk(1), isamlog(1), mysql(1), mysqlaccess(1), mysqladmin(1), mysqld(1), mysqld_multi(1), mysqld_safe(1), mysqldump(1), mysql_fix_privi-
       lege_tables(1), mysqlshow(1), perror(1), replace(1)

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

BUGS

       Please refer to http://bugs.mysql.com/ to report bugs.

AUTHOR

       Ver 1.0, distribution 4.0.24 Michael (Monty) Widenius (monty@mysql.com), MySQL AB (http://www.mysql.com/). This software comes with no war-
       ranty.  Manual  page  by L. (Kill-9) Pedersen (kill-9@kill-9.dk), Mercurmedia Data Model Architect / system developer (http://www.mercurme-
       dia.com)

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +--------------------+------------------------------------+
       |  ATTRIBUTE TYPE    |	       ATTRIBUTE VALUE		 |
       +--------------------+------------------------------------+
       |Availability	    | SUNWmysqlr, SUNWmysqlu, SUNWmysqlt |
       +--------------------+------------------------------------+
       |Interface Stability | External				 |
       +--------------------+------------------------------------+
NOTES

       Source for mysql is available on http://opensolaris.org.

MySQL 4.0							 19 December 2000							    zap(1)
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