MYSQL查看和新增表分区

​MYSQL查看和新增表分区​

1、查看表分区

SELECT

  partition_name part,

  partition_expression expr,

  partition_description descr,

  FROM_DAYS(partition_description) lessthan_sendtime,

  table_rows

FROM

  INFORMATION_SCHEMA.partitions

WHERE

  TABLE_SCHEMA = SCHEMA()

  AND TABLE_NAME='td_sendmessagelog'; ---这里是表名

2、添加表分区

 ALTER TABLE td_sendmessagelog ADD PARTITION (

   PARTITION p20150210 VALUES LESS THAN (TO_DAYS('2015-02-10')),

  PARTITION p20150220 VALUES LESS THAN (TO_DAYS('2015-02-20')),

  PARTITION p20150301 VALUES LESS THAN (TO_DAYS('2015-03-01')),

  PARTITION p20150310 VALUES LESS THAN (TO_DAYS('2015-03-10')),

  PARTITION p20150320 VALUES LESS THAN (TO_DAYS('2015-03-20')),

  PARTITION p20150401 VALUES LESS THAN (TO_DAYS('2015-04-01')),

  PARTITION p20150410 VALUES LESS THAN (TO_DAYS('2015-04-10')),

  PARTITION p20150420 VALUES LESS THAN (TO_DAYS('2015-04-20')),

  PARTITION p20150501 VALUES LESS THAN (TO_DAYS('2015-05-01')),

  PARTITION pmax VALUES LESS THAN (maxvalue)

  );

注意：创建表分区，要指定对应的列。上面例子，用的是一个时间列（sendtime）

创建表过程如下（注意指定的primary key）：

create table td_sendmessagelog  

(  

   id                   int not null,  

   sendtime                 datetime not null

   primary key (id,sendtime)  

) 

创建索引：

create index Index_sid_sendtime on td_sendmessagelog  

(  

   sid,  

   sendtime  

);