Hello, Yu-san,
(へろへろな英語で申し訳ないです)
Can I think that you already tweaked Index on the tables?
if you yet,please create apt indexes.
MyISAM caches only Index without data.
i take way for decreasing disk seek,
1) create more indexes on the tables,if the tables doesn't update quite often.
including data into index forcibly.
this makes slow for insert and update,and this is dirty idea,i think.
(よくSELECTされるカラムをINDEXに含めてしまいます。
ただし、SELECT * FROMで呼ばれることが多い場合には使えない上に
かなり美しくない策です。。)
2) tune filesystem and disk drive parameter for datadir.
MyISAM table's data caches only in the filesystem cache.
But i regret that i don't have knowledge around filesystem.
あまり力になれなくて申し訳ないです。
regards,
ts. tanaka//
2012/5/23 Yu Watanabe <yu.watan...@jp.fujitsu.com>:
> Hello Tsubasa.
>
> Thank you for the reply. (返信ありがとうございます。)
>
> Our high loaded DB are both INNODB and MyISAM.
> Espicially , on MyISAM.
>
> I will consider the tuning of innodb_buffer_pool_size as well.
>
> Do you know the tips for how to tune the disk access for MyISAM?
>
> Thanks,
> Yu
>
> Tsubasa Tanaka さんは書きました:
>>Hello,
>>
>>I seem your mysqld doesn't use enough memory.
>>
>>>>Date Time CPU% RSS VSZ
>>>>2012/5/22 21:00:39 109 294752 540028
>>
>>if your mysqld uses InnoDB oftenly,
>>edit innodb_buffer_pool_size in you my.cnf.
>>
>>http://dev.mysql.com/doc/refman/5.1/en/innodb-parameters.html#sysvar_innodb_buffer_pool_size
>>
>>
>>>>table_cache
>>>>thread_cache_size
>>>>tmp_table_size
>>>>max_heap_table_size
>>>>
>>>>but made not much difference.
>>
>>It is solution for only sql's large result,i think.
>>if you doesn't recognize that problem causes large result,
>>you should approach other way,too.
>>
>>regards,
>>
>>
>>ts. tanaka//
>>
>>2012/5/23 Yu Watanabe <yu.watan...@jp.fujitsu.com>:
>>> Also following is the free command result.
>>>
>>> total used free shared buffers cached
>>> Mem: 8162380 7843676 318704 0 95632 5970892
>>> -/+ buffers/cache: 1777152 6385228
>>> Swap: 8032492 23560 8008932
>>>
>>> Thanks,
>>> Yu
>>>
>>>
>>> Yu Watanabe さんは書きました:
>>>>Hello all.
>>>>
>>>>I would like to ask for advice with performance tuning with MySQL.
>>>>
>>>>Following are some data for my server.
>>>>
>>>>CPU : Xeon(TM) 2.8GHz (2CPUs - 8core total)
>>>>Memory : 8GB
>>>>OS : RHEL 4.4 x86_64
>>>>MySQL : MySQL 5.0.50sp1-enterprise
>>>>
>>>>Attached file
>>>># my.cnf.txt : my.cnf information
>>>># mysqlext_20120522131034.log : variable and status information from
>>>>mysqladmin
>>>>
>>>>I have 2 database working with high load.
>>>>
>>>>I wanted to speed up my select and update queries not by
>>>>optimizing the query itself but tuning the my.cnf.
>>>>
>>>>I have referred to following site,
>>>>http://dev.mysql.com/doc/refman/5.0/en/server-status-variables.html
>>>>
>>>>and read "Hiperformance Mysql vol.2" ,
>>>>and increased the following values,
>>>>
>>>>table_cache
>>>>thread_cache_size
>>>>tmp_table_size
>>>>max_heap_table_size
>>>>
>>>>but made not much difference.
>>>>
>>>>According to the ps and sar result
>>>>
>>>>*1 PS result
>>>>Date Time CPU% RSS VSZ
>>>>2012/5/22 21:00:39 109 294752 540028
>>>>
>>>>*2 SAR
>>>>Average CPU user 25%
>>>> sys 5%
>>>> io 3%
>>>>
>>>>I assume that MySQL can work more but currently not.
>>>>
>>>>I am considersing to off load 1 high load database to
>>>>seperate process and make MySQL work in multiple process.
>>>>
>>>>It would be a great help if people in this forum can give
>>>>us an adivice for the tuning.
>>>>
>>>>Best Regards,
>>>>Yu Watanabe
>>>>
>>>>______________________________________________________________________
>>>>
>>>>
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>>>
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