Re: Need help for performance tuning with Mysql
Check performance with script :
http://mysqltuner.pl/mysqltuner.pl - Variable tunning
http://hackmysql.com/mysqlidxchk - Unused Index
Thanks,
Prabhat
On Thu, May 24, 2012 at 4:32 PM, Rick James rja...@yahoo-inc.com wrote:
Thanks. I got tired of answering the same questions about buffer_pool and
key_buffer over and over on forums.mysql.com; now I just point people at
that page.
INT(1) and INT(50) are identical -- and take 4 bytes. See TINYINT,
BIGINT, etc. Also, UNSIGNED is probably wanted in more places than you
have it.
555KB is not very big. But a table scan (as indicated by the EXPLAIN)
costs something.
select * -- Is this what you are really fetching? If not, we
can discuss a covering index.
from thold_data
where thold_enabled='on' -- 2-valued flag? Not likely to be useful in
an index, esp. not by itself
AND data_id = 91633; -- Probably the best bet.
Recommend:
INDEX(data_id) -- or UNIQUE, if it is unique
INDEX(data_id, thold_enabled) -- or the opposite order; this probably
would not be noticeable better.
`notify_default` enum('on','off') default NULL
Did you really mean to have 3 values (on, off, NULL)?
-Original Message-
From: Yu Watanabe [mailto:yu.watan...@jp.fujitsu.com]
Sent: Wednesday, May 23, 2012 7:10 PM
To: mysql@lists.mysql.com
Subject: Re: Need help for performance tuning with Mysql
Rick
Thank you for the reply.
1. There are only a few things worth tuning -- see
http://mysql.rjweb.org/doc.php/memory (they don't include the ones you
tried)
The page is really cool. Its very simple and easy to understand.
2. Instead INDEXes and schema design must be studied. Please provide:
SHOW CREATE TABLE
| thold_data | CREATE TABLE `thold_data` (
`id` int(11) NOT NULL auto_increment,
`rra_id` int(11) NOT NULL default '0',
`data_id` int(11) NOT NULL default '0',
`thold_hi` varchar(100) default NULL,
`thold_low` varchar(100) default NULL,
`thold_fail_trigger` int(10) unsigned default NULL,
`thold_fail_count` int(11) NOT NULL default '0',
`thold_alert` int(1) NOT NULL default '0',
`thold_enabled` enum('on','off') NOT NULL default 'on',
`bl_enabled` enum('on','off') NOT NULL default 'off',
`bl_ref_time` int(50) unsigned default NULL,
`bl_ref_time_range` int(10) unsigned default NULL,
`bl_pct_down` int(10) unsigned default NULL,
`bl_pct_up` int(10) unsigned default NULL,
`bl_fail_trigger` int(10) unsigned default NULL,
`bl_fail_count` int(11) unsigned default NULL,
`bl_alert` int(2) NOT NULL default '0',
`lastread` varchar(100) default NULL,
`oldvalue` varchar(100) NOT NULL default '',
`repeat_alert` int(10) unsigned default NULL,
`notify_default` enum('on','off') default NULL,
`notify_extra` varchar(255) default NULL,
`host_id` int(10) default NULL,
`syslog_priority` int(2) default '3',
`cdef` int(11) NOT NULL default '0',
PRIMARY KEY (`id`),
KEY `rra_id` (`rra_id`)
) ENGINE=MyISAM AUTO_INCREMENT=69641 DEFAULT CHARSET=latin1 |
SHOW TABLE SIZE
You must be mentioning about the show table status
mysql show table status where name = thold_data;
+++-++--++-
+-+--+---+-
---+-+-
+-+---+--+
+-+
| Name | Engine | Version | Row_format | Rows | Avg_row_length |
Data_length | Max_data_length | Index_length | Data_free |
Auto_increment | Create_time | Update_time | Check_time
| Collation | Checksum | Create_options | Comment |
+++-++--++-
+-+--+---+-
---+-+-
+-+---+--+
+-+
| thold_data | MyISAM | 10 | Dynamic| 6161 | 90 |
555128 | 281474976710655 | 140288 | 0 | 70258 |
2012-05-24 10:41:47 | 2012-05-24 10:47:19 | 2012-05-24
10:41:47 | latin1_swedish_ci | NULL || |
+++-++--++-
+-+--+---+-
---+-+-
+-+---+--+
+-+
1 row in set (0.00 sec)
EXPLAIN SELECT
I have seen the following select query in the slow query log.
I also saw update queries as well.
mysql explain select * from thold_data where thold_enabled='on' AND
mysql data_id = 91633
Re: Need help for performance tuning with Mysql
Alex Thank you for the advice. Probably, we will put index (key) on both columns. Thanks, Yu Alex Schaft さんは書きました: On 2012/05/24 07:37, Alex Schaft wrote: You are selecting a record based on the value of data_id and thold_enabled, but don't have an index on either? Add an index for both. If data_id is unique, then you would only need an index on that. Alex On second thought, an index on thold_enabled won't mean much I think, so either leave it off or create an index on data_id plus thold_enabled. Someone more knowledgeable may correct me. Alex -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Need help for performance tuning with Mysql
Johnny Thank you for the reply. Second, make sure your Innodb buffer pool is allocating as much ram as possible. I'd even go as far as adding another 8gb of ram to the server. The buffer pool setting is going to give you the best performance increase. The problem is mainly on MyISAM engine. Also, what kind of hard disks do you have the data files on? Raid? No raid? The server has no RAID. Thanks, Yu Johnny Withers さんは書きました: I don't see any attachments. First, I would upgrade to 5.5 as 5.0 is very old. The upgrade process is painless. Second, make sure your Innodb buffer pool is allocating as much ram as possible. I'd even go as far as adding another 8gb of ram to the server. The buffer pool setting is going to give you the best performance increase. Also, what kind of hard disks do you have the data files on? Raid? No raid? Sent from my iPad On May 22, 2012, at 9:08 PM, Yu Watanabe yu.watan...@jp.fujitsu.com wrote: 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 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
RE: Need help for performance tuning with Mysql
Thanks. I got tired of answering the same questions about buffer_pool and
key_buffer over and over on forums.mysql.com; now I just point people at that
page.
INT(1) and INT(50) are identical -- and take 4 bytes. See TINYINT, BIGINT,
etc. Also, UNSIGNED is probably wanted in more places than you have it.
555KB is not very big. But a table scan (as indicated by the EXPLAIN) costs
something.
select * -- Is this what you are really fetching? If not, we can
discuss a covering index.
from thold_data
where thold_enabled='on' -- 2-valued flag? Not likely to be useful in an
index, esp. not by itself
AND data_id = 91633; -- Probably the best bet.
Recommend:
INDEX(data_id) -- or UNIQUE, if it is unique
INDEX(data_id, thold_enabled) -- or the opposite order; this probably would
not be noticeable better.
`notify_default` enum('on','off') default NULL
Did you really mean to have 3 values (on, off, NULL)?
-Original Message-
From: Yu Watanabe [mailto:yu.watan...@jp.fujitsu.com]
Sent: Wednesday, May 23, 2012 7:10 PM
To: mysql@lists.mysql.com
Subject: Re: Need help for performance tuning with Mysql
Rick
Thank you for the reply.
1. There are only a few things worth tuning -- see
http://mysql.rjweb.org/doc.php/memory (they don't include the ones you
tried)
The page is really cool. Its very simple and easy to understand.
2. Instead INDEXes and schema design must be studied. Please provide:
SHOW CREATE TABLE
| thold_data | CREATE TABLE `thold_data` (
`id` int(11) NOT NULL auto_increment,
`rra_id` int(11) NOT NULL default '0',
`data_id` int(11) NOT NULL default '0',
`thold_hi` varchar(100) default NULL,
`thold_low` varchar(100) default NULL,
`thold_fail_trigger` int(10) unsigned default NULL,
`thold_fail_count` int(11) NOT NULL default '0',
`thold_alert` int(1) NOT NULL default '0',
`thold_enabled` enum('on','off') NOT NULL default 'on',
`bl_enabled` enum('on','off') NOT NULL default 'off',
`bl_ref_time` int(50) unsigned default NULL,
`bl_ref_time_range` int(10) unsigned default NULL,
`bl_pct_down` int(10) unsigned default NULL,
`bl_pct_up` int(10) unsigned default NULL,
`bl_fail_trigger` int(10) unsigned default NULL,
`bl_fail_count` int(11) unsigned default NULL,
`bl_alert` int(2) NOT NULL default '0',
`lastread` varchar(100) default NULL,
`oldvalue` varchar(100) NOT NULL default '',
`repeat_alert` int(10) unsigned default NULL,
`notify_default` enum('on','off') default NULL,
`notify_extra` varchar(255) default NULL,
`host_id` int(10) default NULL,
`syslog_priority` int(2) default '3',
`cdef` int(11) NOT NULL default '0',
PRIMARY KEY (`id`),
KEY `rra_id` (`rra_id`)
) ENGINE=MyISAM AUTO_INCREMENT=69641 DEFAULT CHARSET=latin1 |
SHOW TABLE SIZE
You must be mentioning about the show table status
mysql show table status where name = thold_data;
+++-++--++-
+-+--+---+-
---+-+-
+-+---+--+
+-+
| Name | Engine | Version | Row_format | Rows | Avg_row_length |
Data_length | Max_data_length | Index_length | Data_free |
Auto_increment | Create_time | Update_time | Check_time
| Collation | Checksum | Create_options | Comment |
+++-++--++-
+-+--+---+-
---+-+-
+-+---+--+
+-+
| thold_data | MyISAM | 10 | Dynamic| 6161 | 90 |
555128 | 281474976710655 | 140288 | 0 | 70258 |
2012-05-24 10:41:47 | 2012-05-24 10:47:19 | 2012-05-24
10:41:47 | latin1_swedish_ci | NULL || |
+++-++--++-
+-+--+---+-
---+-+-
+-+---+--+
+-+
1 row in set (0.00 sec)
EXPLAIN SELECT
I have seen the following select query in the slow query log.
I also saw update queries as well.
mysql explain select * from thold_data where thold_enabled='on' AND
mysql data_id = 91633;
++-++--+---+--+
-+--+--+-+
| id | select_type | table | type | possible_keys | key | key_len
| ref | rows | Extra |
++-++--+---+--+
-+--+--+-+
| 1 | SIMPLE | thold_data | ALL | NULL
Re: Need help for performance tuning with Mysql
Yu, The upgrade to 5.5 that Jonny advises should NOT your first action. If MySQL is mis-configured on 5.0 it will likely be misconfigured on 5.1 and 5.5. Test your application thoroughly on the new version before heeding that advice. Read the change logs and known bugs. Running the upgrade might seem painless but if you have some legacy feature in place then things will not work how you may expect them to. Review your needs and see if a switch to innodb storage engine will give you any performance gain. The locking differences alone might make this worthwhile. TEST it. You did not state your data and index size. You will benefit from having enough RAM so that your 'working' data set fits to memory. This isn't possible/practical for large data but if you have a 5G dataset and 8G available memory you might not need to rush out and spend money. If you're heavily using MyISAM, review and tune the MyISAM related buffers. If you are working mostly with InnoDB tune those variables. Measure, change measure again. It might be an iterative process but you will learn lots along the way. Good luck. Andy On Wed, May 23, 2012 at 5:44 AM, Tsubasa Tanaka yoku0...@gmail.com wrote: 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 sharedbuffers cached Mem: 81623807843676 318704 0 95632 5970892 -/+ buffers/cache:17771526385228 Swap: 8032492 235608008932 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 __ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql --
Re: Need help for performance tuning with Mysql
Hi, How much ever tuning you do at my.cnf will not help much, if you do not tune your sql's. Your first priority should be tune sql's, which will give you good performance even with decent memory allocations and other settings regards anandkl On Wed, May 23, 2012 at 3:45 PM, Andrew Moore eroomy...@gmail.com wrote: Yu, The upgrade to 5.5 that Jonny advises should NOT your first action. If MySQL is mis-configured on 5.0 it will likely be misconfigured on 5.1 and 5.5. Test your application thoroughly on the new version before heeding that advice. Read the change logs and known bugs. Running the upgrade might seem painless but if you have some legacy feature in place then things will not work how you may expect them to. Review your needs and see if a switch to innodb storage engine will give you any performance gain. The locking differences alone might make this worthwhile. TEST it. You did not state your data and index size. You will benefit from having enough RAM so that your 'working' data set fits to memory. This isn't possible/practical for large data but if you have a 5G dataset and 8G available memory you might not need to rush out and spend money. If you're heavily using MyISAM, review and tune the MyISAM related buffers. If you are working mostly with InnoDB tune those variables. Measure, change measure again. It might be an iterative process but you will learn lots along the way. Good luck. Andy On Wed, May 23, 2012 at 5:44 AM, Tsubasa Tanaka yoku0...@gmail.com wrote: 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 sharedbuffers cached Mem: 81623807843676 318704 0 95632 5970892 -/+ buffers/cache:17771526385228 Swap: 8032492 235608008932 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.
RE: Need help for performance tuning with Mysql
100% CPU -- A slow query. Tuning will not help. Period. 1. There are only a few things worth tuning -- see http://mysql.rjweb.org/doc.php/memory (they don't include the ones you tried) 2. Instead INDEXes and schema design must be studied. Please provide: SHOW CREATE TABLE SHOW TABLE SIZE EXPLAIN SELECT ... -Original Message- From: Yu Watanabe [mailto:yu.watan...@jp.fujitsu.com] Sent: Tuesday, May 22, 2012 7:07 PM To: mysql@lists.mysql.com Subject: Need help for performance tuning with Mysql 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 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Need help for performance tuning with Mysql
Rick
Thank you for the reply.
1. There are only a few things worth tuning -- see
http://mysql.rjweb.org/doc.php/memory (they don't include the ones you tried)
The page is really cool. Its very simple and easy to understand.
2. Instead INDEXes and schema design must be studied. Please provide:
SHOW CREATE TABLE
| thold_data | CREATE TABLE `thold_data` (
`id` int(11) NOT NULL auto_increment,
`rra_id` int(11) NOT NULL default '0',
`data_id` int(11) NOT NULL default '0',
`thold_hi` varchar(100) default NULL,
`thold_low` varchar(100) default NULL,
`thold_fail_trigger` int(10) unsigned default NULL,
`thold_fail_count` int(11) NOT NULL default '0',
`thold_alert` int(1) NOT NULL default '0',
`thold_enabled` enum('on','off') NOT NULL default 'on',
`bl_enabled` enum('on','off') NOT NULL default 'off',
`bl_ref_time` int(50) unsigned default NULL,
`bl_ref_time_range` int(10) unsigned default NULL,
`bl_pct_down` int(10) unsigned default NULL,
`bl_pct_up` int(10) unsigned default NULL,
`bl_fail_trigger` int(10) unsigned default NULL,
`bl_fail_count` int(11) unsigned default NULL,
`bl_alert` int(2) NOT NULL default '0',
`lastread` varchar(100) default NULL,
`oldvalue` varchar(100) NOT NULL default '',
`repeat_alert` int(10) unsigned default NULL,
`notify_default` enum('on','off') default NULL,
`notify_extra` varchar(255) default NULL,
`host_id` int(10) default NULL,
`syslog_priority` int(2) default '3',
`cdef` int(11) NOT NULL default '0',
PRIMARY KEY (`id`),
KEY `rra_id` (`rra_id`)
) ENGINE=MyISAM AUTO_INCREMENT=69641 DEFAULT CHARSET=latin1 |
SHOW TABLE SIZE
You must be mentioning about the show table status
mysql show table status where name = thold_data;
+++-++--++-+-+--+---++-+-
+-+---+--++-+
| Name | Engine | Version | Row_format | Rows | Avg_row_length |
Data_length | Max_data_length | Index_length | Data_free | Auto_increment |
Create_time | Update_time | Check_time
| Collation | Checksum | Create_options | Comment |
+++-++--++-+-+--+---++-+-
+-+---+--++-+
| thold_data | MyISAM | 10 | Dynamic| 6161 | 90 |
555128 | 281474976710655 | 140288 | 0 | 70258 |
2012-05-24 10:41:47 | 2012-05-24 10:47:19 | 2012-05-24
10:41:47 | latin1_swedish_ci | NULL || |
+++-++--++-+-+--+---++-+-
+-+---+--++-+
1 row in set (0.00 sec)
EXPLAIN SELECT
I have seen the following select query in the slow query log.
I also saw update queries as well.
mysql explain select * from thold_data where thold_enabled='on' AND data_id =
91633;
++-++--+---+--+-+--+--+-+
| id | select_type | table | type | possible_keys | key | key_len | ref
| rows | Extra |
++-++--+---+--+-+--+--+-+
| 1 | SIMPLE | thold_data | ALL | NULL | NULL | NULL| NULL
| 6161 | Using where |
++-++--+---+--+-+--+--+-+
1 row in set (0.06 sec)
If cache size tuning is not an option ,
do you think that following action would be an choice to faten the queries
little bit more?
1. depriving the database and setup as an another process. (multiple mysql
processes)
2. Move the MYD, MYI, frm to ram disk (/dev/shm)
Thanks,
Yu
Rick James さんは書きました:
100% CPU -- A slow query. Tuning will not help. Period.
1. There are only a few things worth tuning -- see
http://mysql.rjweb.org/doc.php/memory (they don't include the ones you tried)
2. Instead INDEXes and schema design must be studied. Please provide:
SHOW CREATE TABLE
SHOW TABLE SIZE
EXPLAIN SELECT ...
-Original Message-
From: Yu Watanabe [mailto:yu.watan...@jp.fujitsu.com]
Sent: Tuesday, May 22, 2012 7:07 PM
To: mysql@lists.mysql.com
Subject: Need help for performance tuning with Mysql
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
Re: Need help for performance tuning with Mysql
On 2012/05/24 04:10, Yu Watanabe wrote:
2. Instead INDEXes and schema design must be studied. Please provide:
SHOW CREATE TABLE
| thold_data | CREATE TABLE `thold_data` (
`id` int(11) NOT NULL auto_increment,
`rra_id` int(11) NOT NULL default '0',
`data_id` int(11) NOT NULL default '0',
`thold_hi` varchar(100) default NULL,
`thold_low` varchar(100) default NULL,
`thold_fail_trigger` int(10) unsigned default NULL,
`thold_fail_count` int(11) NOT NULL default '0',
`thold_alert` int(1) NOT NULL default '0',
`thold_enabled` enum('on','off') NOT NULL default 'on',
`bl_enabled` enum('on','off') NOT NULL default 'off',
`bl_ref_time` int(50) unsigned default NULL,
`bl_ref_time_range` int(10) unsigned default NULL,
`bl_pct_down` int(10) unsigned default NULL,
`bl_pct_up` int(10) unsigned default NULL,
`bl_fail_trigger` int(10) unsigned default NULL,
`bl_fail_count` int(11) unsigned default NULL,
`bl_alert` int(2) NOT NULL default '0',
`lastread` varchar(100) default NULL,
`oldvalue` varchar(100) NOT NULL default '',
`repeat_alert` int(10) unsigned default NULL,
`notify_default` enum('on','off') default NULL,
`notify_extra` varchar(255) default NULL,
`host_id` int(10) default NULL,
`syslog_priority` int(2) default '3',
`cdef` int(11) NOT NULL default '0',
PRIMARY KEY (`id`),
KEY `rra_id` (`rra_id`)
) ENGINE=MyISAM AUTO_INCREMENT=69641 DEFAULT CHARSET=latin1 |
EXPLAIN SELECT
I have seen the following select query in the slow query log.
I also saw update queries as well.
mysql explain select * from thold_data where thold_enabled='on' AND data_id
= 91633;
++-++--+---+--+-+--+--+-+
| id | select_type | table | type | possible_keys | key | key_len | ref
| rows | Extra |
++-++--+---+--+-+--+--+-+
| 1 | SIMPLE | thold_data | ALL | NULL | NULL | NULL|
NULL | 6161 | Using where |
++-++--+---+--+-+--+--+-+
1 row in set (0.06 sec)
If cache size tuning is not an option ,
do you think that following action would be an choice to faten the queries
little bit more?
You are selecting a record based on the value of data_id and
thold_enabled, but don't have an index on either? Add an index for both.
If data_id is unique, then you would only need an index on that.
Alex
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Re: Need help for performance tuning with Mysql
On 2012/05/24 07:37, Alex Schaft wrote: You are selecting a record based on the value of data_id and thold_enabled, but don't have an index on either? Add an index for both. If data_id is unique, then you would only need an index on that. Alex On second thought, an index on thold_enabled won't mean much I think, so either leave it off or create an index on data_id plus thold_enabled. Someone more knowledgeable may correct me. Alex -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Need help for performance tuning with Mysql
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 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Need help for performance tuning with Mysql
Also following is the free command result. total used free sharedbuffers cached Mem: 81623807843676 318704 0 956325970892 -/+ buffers/cache:17771526385228 Swap: 8032492 235608008932 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 __ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Need help for performance tuning with Mysql
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 sharedbuffers cached Mem: 81623807843676 318704 0 956325970892 -/+ buffers/cache:17771526385228 Swap: 8032492 235608008932 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 __ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Need help for performance tuning with Mysql
I don't see any attachments. First, I would upgrade to 5.5 as 5.0 is very old. The upgrade process is painless. Second, make sure your Innodb buffer pool is allocating as much ram as possible. I'd even go as far as adding another 8gb of ram to the server. The buffer pool setting is going to give you the best performance increase. Also, what kind of hard disks do you have the data files on? Raid? No raid? Sent from my iPad On May 22, 2012, at 9:08 PM, Yu Watanabe yu.watan...@jp.fujitsu.com wrote: 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 -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Need help for performance tuning with Mysql
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 sharedbuffers cached Mem: 81623807843676 318704 0 956325970892 -/+ buffers/cache:17771526385228 Swap: 8032492 235608008932 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 __ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
Re: Need help for performance tuning with Mysql
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 sharedbuffers cached Mem: 81623807843676 318704 0 956325970892 -/+ buffers/cache:17771526385228 Swap: 8032492 235608008932 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 __ -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/mysql
