mysql 分表分区小记（一）_MySQL
分表
第一种 是做mysql集群利用mysql cluster ，mysql proxy，mysql replication，drdb等等
第二种 是把访问频繁的且数据量大的表拆成若干小表
第三种 是利用mysql merge存储引擎分表
分区
第一种 RANGE分区：基于属于一个给定连续区间的列值，把多行分配给分区。
第二种 LIST分区：类似于按RANGE分区，区别在于LIST分区是基于列值匹配一个离散值集合中的某个值来进行选择。
第三种 HASH分区：基于用户定义的表达式的返回值来进行选择的分区，该表达式使用将要插入到表中的这些行的列值进行计算。这个函数可以包含MySQL 中有效的、产生非负整数值的任何表达式。
第四种 KEY分区：类似于按HASH分区，区别在于KEY分区只支持计算一列或多列，且MySQL 服务器提供其自身的哈希函数。必须有一列或多列包含整数值。
分表的好处 是提高单表的并发能力当然IO磁盘能力也有所提高
分区的好处 是提供IO磁盘的读写能力
一般访问频繁且数据量大的采用分表
访问一般 数据量大的采取分区
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