MYSQL查看和新增表分区

Posted 2021-09-01 xz_xiaoshan

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  
);