MySQL my.cnf性能调优建议

Question

我有点希望有人能够提供一些帮助来优化my.cnf文件以获得极高容量的mysql数据库服务器.

Our architecture is as follows:

Memory     : 96GB
CPUs       : 12
OS & Mysql : 64-bit
Disk Space : 1.2 TB
DB Engine  : MyISAM

我们的Web应用程序大约300个客户端同时使用.我们需要调整my.cnf,以便为此基础架构提供最佳性能.

我完全清楚索引和优化查询是这方面的一个主要因素,但我们希望从一个正确配置的系统开始,然后通过系统地重新设计我们的查询来跟进它.

Here is our current my.cnf file content:

[mysqld]
datadir=/home/mysql
socket=/home/mysql/mysql.sock
user=mysql

log-bin=mysql-bin
server-id=1
# Disabling symbolic-links is recommended to prevent assorted security risks
symbolic-links=1

log-slow-queries = /var/log/mysqld_slow_queries.log
long_query_time = 10

max_connections = 500

key_buffer_size = 32768M
#max_allowed_packet = 2M
#table_open_cache = 128
#sort_buffer_size = 1024K
#net_buffer_length = 64K
#read_buffer_size = 1024K
#read_rnd_buffer_size = 1024K
#myisam_sort_buffer_size = 8M
query_cache_size = 128M
query_cache_limit = 128M

interactive_timeout = 300
wait_timeout = 300

# Added values after load testing
thread_cache_size = 8
#tmp_table_size = 256M
#max_heap_table_size = 256M
#table_cache = 512
#join_buffer_size = 512

log-error=/var/log/mysqld.log

innodb_buffer_pool_size=128M
#innodb_file_per_table
#innodb_log_file_size=250M
##innodb_buffer_pool_size=64M
#innodb_buffer_pool_size=1024M
#innodb_log_buffer_size=4M
##log-bin=mysql-bin

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid

#[myisamchk]
#key_buffer = 64M
#sort_buffer = 64M
#read_buffer = 16M
#write_buffer = 16M

有什么建议？谢谢大家.

由RolandoMySQLDBA编辑

由于您的所有数据都是MyISAM,请运行此查询并显示输出

SELECT CONCAT(ROUND(KBS/POWER(1024,
IF(PowerOf1024<0,0,IF(PowerOf1024>3,0,PowerOf1024)))+0.4999),
SUBSTR(' KMG',IF(PowerOf1024<0,0,
IF(PowerOf1024>3,0,PowerOf1024))+1,1))
recommended_key_buffer_size FROM
(SELECT LEAST(POWER(2,32),KBS1) KBS
FROM (SELECT SUM(index_length) KBS1
FROM information_schema.tables
WHERE engine='MyISAM' AND
table_schema NOT IN ('information_schema','mysql')) AA ) A,
(SELECT 3 PowerOf1024) B;

@Rolando - 谢谢......该查询的结果是4G.

Answer 1

尝试从Percona向导开始,逐一将它们的建议与当前设置进行比较.不要担心没有您想象的那么多适用设置.

https://tools.percona.com/wizard

每个人都指出了key_buffer_size你已经解决过的问题.对于96GB内存,我会警惕任何微小的默认值(可能只有96M!).

Answer 2

我试过这个工具,它给了我很好的结果.

https://github.com/major/MySQLTuner-perl