Mysql数据库大表归档操作
由于公司的某个系统数据表过亿，考虑到数据表的压力。所以根据某个时间点对数据表做了一个归档。以下的操作是在当前的数据库新建表用于存储历史数据，然后再对生产表做一个清理操作。如果有条件的话可以把归档的数据放在一台新的数据库服务器上。（具体的表名和时间结点根据自己需要修改）
归档sql：
方法一： 复制表并且按照条件插入数据（此种方法除了主键索引不包括其他索引）
- CREATE TABLE lime_survey_549656_20151001 as select * from lime_survey_549656 where submitdate < "2015-10-01 00:00:00";
- ALTER TABLE lime_survey_549656_20151001 change id id int primary key auto_increment;
- CREATE TABLE lime_survey_186194_20151001 as select * from lime_survey_186194 where submitdate < "2015-10-01 00:00:00";
- ALTER TABLE lime_survey_186194_20151001 change id id int primary key auto_increment;
- CREATE TABLE lime_survey_279575_20151001 as select * from lime_survey_279575 where submitdate < "2015-10-01 00:00:00";
- ALTER TABLE lime_survey_279575_20151001 change id id int primary key auto_increment;
方法二： 创建一张空表，结构和索引和原表一样
- create table lime_survey_549656_20151001 like lime_survey_549656;
- INSERT INTO lime_survey_549656_20151001 select * from lime_survey_549656 where submitdate < "2015-10-01 00:00:00";
- create table lime_survey_186194_20151001 like lime_survey_186194;
- INSERT INTO lime_survey_186194_20151001 select * from lime_survey_186194 where submitdate < "2015-10-01 00:00:00";
- create table lime_survey_279575_20151001 like lime_survey_279575;
- INSERT INTO lime_survey_279575_20151001 select * from lime_survey_279575 where submitdate < "2015-10-01 00:00:00";
数据归档成功后清理数据sql:
- delete from lime_survey_549656 where submitdate < "2015-10-0100:00:00";
- delete from lime_survey_186194 where submitdate < "2015-10-0100:00:00";
- delete from lime_survey_279575 where submitdate < "2015-10-0100:00:00";
