跨多个磁盘传播mysql数据

Question

我有一个大的mysql数据库和两个小磁盘上的centos，我该如何使它利用两个磁盘？

Answer 1

您可以将表分区到多个驱动器上。查看官方手册，其中深入讨论了这一主题。

http://dev.mysql.com/doc/refman/5.5/en/partitioning.html

这里有一个例子在多个驱动器分区现有的表：

ALTER TABLE mytable 
    PARTITION BY RANGE (mycolumn)(
    PARTITION p01 VALUES Less Than (10000) 
     DATA DIRECTORY = "/mnt/disk1" 
     INDEX DIRECTORY = "/mnt/disk1", 
    PARTITION p02 VALUES Less Than (20000) 
     DATA DIRECTORY = "/mnt/disk2" 
     INDEX DIRECTORY = "/mnt/disk2", 
    PARTITION p03 VALUES Less Than MAXVALUE 
     DATA DIRECTORY = "/mnt/disk3" 
     INDEX DIRECTORY = "/mnt/disk3" 
    ); 

记住，这需要NO_DIR_IN_CREATE被关闭。它似乎不适用于Windows，它似乎不适用于InnoDB。

ALTER TABLE mytable REORGANIZE PARTITION p03 INTO 
( 
    PARTITION p03 VALUES Less Than (30000) 
     DATA DIRECTORY = "/mnt/disk3" 
     INDEX DIRECTORY = "/mnt/disk3", 
    PARTITION p04 VALUES Less Than MAXVALUE 
     DATA DIRECTORY = "/mnt/disk4" 
     INDEX DIRECTORY = "/mnt/disk4" 
);