1. 建立分割槽表
create table `表名` (
`equipmentid` char(17) not null,
`attributeid` char(4) not null,
`value` varchar(20) not null,
`collecttime` datetime not null
)
engine=innodb (適用大部分引擎,可根據需要調整)
default charset=gbk(編碼可根據需要修改)
partition by range (to_days(collecttime))
(partition pmin values less than (to_days('2010-01-01')),
partition p201001 values less than (to_days('2010-02-01')) ,
partition p201002 values less than (to_days('2010-03-01')) ,
partition p201003 values less than (to_days('2010-04-01')) ,
partition p201004 values less than (to_days('2010-05-01')) ,
partition p201005 values less than (to_days('2010-06-01')) ,
partition p201006 values less than (to_days('2010-07-01')) ,
partition p201007 values less than (to_days('2010-08-01')) ,
partition p201008 values less than (to_days('2010-09-01')) ,
partition p201009 values less than (to_days('2010-10-01')) ,
partition p201010 values less than (to_days('2010-11-01')),
partition p201011 values less than (to_days('2010-12-01')),
partition p201012 values less than (to_days('2011-01-01')),
partition p201101 values less than (to_days('2011-02-01')),
partition p201102 values less than (to_days('2011-03-01')),
partition p201103 values less than (to_days('2011-04-01')),
partition p201104 values less than (to_days('2011-05-01')),
partition p201105 values less than (to_days('2011-06-01')),
partition p201106 values less than (to_days('2011-07-01')),
partition p201107 values less than (to_days('2011-08-01')),
partition p201108 values less than (to_days('2011-09-01')),
partition p201109 values less than (to_days('2011-10-01')),
partition p201110 values less than (to_days('2011-11-01')),
partition p201111 values less than (to_days('2011-12-01')),
partition p201112 values less than (to_days('2012-01-01')),
partition pmax values less than maxvalue );2. 為現有表建立分割槽alter table 表名
partition by range (to_days(collecttime))
(partition pmin values less than (to_days('2010-01-01')),
partition p201001 values less than (to_days('2010-02-01')) ,
partition p201002 values less than (to_days('2010-03-01')) ,
partition p201003 values less than (to_days('2010-04-01')) ,
partition p201004 values less than (to_days('2010-05-01')) ,
partition p201005 values less than (to_days('2010-06-01')) ,
partition p201006 values less than (to_days('2010-07-01')) ,
partition p201007 values less than (to_days('2010-08-01')) ,
partition p201008 values less than (to_days('2010-09-01')) ,
partition p201009 values less than (to_days('2010-10-01')) ,
partition p201010 values less than (to_days('2010-11-01')),
partition p201011 values less than (to_days('2010-12-01')),
partition p201012 values less than (to_days('2011-01-01')),
partition p201101 values less than (to_days('2011-02-01')),
partition p201102 values less than (to_days('2011-03-01')),
partition p201103 values less than (to_days('2011-04-01')),
partition p201104 values less than (to_days('2011-05-01')),
partition p201105 values less than (to_days('2011-06-01')),
partition p201106 values less than (to_days('2011-07-01')),
partition p201107 values less than (to_days('2011-08-01')),
partition p201108 values less than (to_days('2011-09-01')),
partition p201109 values less than (to_days('2011-10-01')),
partition p201110 values less than (to_days('2011-11-01')),
partition p201111 values less than (to_days('2011-12-01')),
partition p201112 values less than (to_days('2012-01-01')),
partition pmax values less than maxvalue );如果表中已有資料,分割槽時會自動進行分割槽儲存,不必擔心資料丟失或者手動分類資料.
3. 刪除表中的指定分割槽
alter table 表名 drop partition 分割槽名;4. 追加表分割槽alter table 表名 drop partition pmax;
alter table 表名
add partition (
partition p201201 values less than (to_days('2012-2-1')),
partition pmax values less than maxvalue);5. 檢視表分割槽資訊select
partition_name part,
partition_expression expr,
partition_description descr,
table_rows
from
information_schema.partitions
where
table_name='表名';6. 檢視查詢語句涉及分割槽資訊explain partitions
select … from 表名 where …;
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