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使用ssd硬盘加速mysql index查询_MySQL

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Release: 2016-06-01 13:34:11
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使用ssd硬盘加速mysql index查询

 

如果数据量比较大,而ssd容量又不是很大,那么可以考虑把index索引数据存到ssd上,把表数据还是存在旧的硬盘上。

 

那么怎么让mysql把index索引建在ssd上并使用ssd上的index数据呢?

 

1.在ssd上建几个目录

 

mkdir /ssd/mysql_indexes

mkdir /ssd/mysql_indexes/my_big_db_name

chmod 700  /ssd/mysql_indexes

chown –R mysql:mysql /ssd/mysql_indexes

 

2.使用MyISAM引擎的可以在mysql的配置中添加下面配置,可以加速索引的重建

 

[mysqld]

myisam_repair_threads=10

 

3.最后我们执行下面的query让mysql切换表的索引数据位置

 

ALTER TABLE my_table INDEX DIRECTORY= '/ssd/mysql_indexes/my_big_db_name'; 

 

这个必须得等到mysql的index重建之后,才能明显感觉到数据库已经快起来了。

 

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