在多个磁盘上传播mysql数据

Question

我有一个庞大的mysql数据库和centos上的两个小磁盘,如何让它利用两个磁盘？

Answer 1

您可以在多个驱动器上对表进行分区.请查看官方手册,其中深入介绍了此主题.

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

以下是在多个驱动器上对现有表进行分区的示例:

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"
    );

请注意,这需要关闭NO_DIR_IN_CREATE.它似乎不适用于Windows,它似乎不适用于InnoDB.

如果最后一个分区上的磁盘空间不足,可以使用以下语句将其拆分:

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"
);