MYSQL查看和新增表分區，mysql新增分區

MYSQL查看和新增表分區，mysql新增分區

MYSQL查看和新增表分區

1、查看錶分區

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'; ---這裡是表名

2、添加表分區

 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：建立表分區，要指定對應的列。上面例子，用的是一個時間列（sendtime）

建立表過程如下（注意指定的primary key）：

create table td_sendmessagelog  
(  
   id                   int not null,  
   sendtime                 datetime not null
   primary key (id,sendtime)  
) 

建立索引：

create index Index_sid_sendtime on td_sendmessagelog  
(  
   sid,  
   sendtime  
);