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=el_user_category_litera; ---这里是表名

2、添加表分区

ALTER TABLE el_user_category_litera 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 el_user_category_litera
(  
   id                   int not null,  
   sendtime                 datetime not null
   primary key (id,sendtime)  
)

创建索引：

create index Index_sid_sendtime on el_user_category_litera
(  
   id,  
   sendtime  
);