Question

我需要在时态数据中对MySQL表进行分区（字段从下表开始）。

CREATE TABLE `table1` (
  `id` bigint(20) NOT NULL AUTO_INCREMENT, 
  `fk_id` bigint(20) NOT NULL,  
  `begin` bigint(20) NOT NULL,     
  PRIMARY KEY (`id`),
  KEY `FK1E57078DB20EC268` (`fk_id`)
) ENGINE=MyISAM AUTO_INCREMENT=10443288 DEFAULT CHARSET=latin1

当我尝试像这样分区时：

alter table table1 partition by range (begin) (
PARTITION until_2010_07 VALUES LESS THAN (1280620800000),
PARTITION 2010_08 VALUES LESS THAN (1283299200000),
PARTITION 2010_09 VALUES LESS THAN (1285891200000),
PARTITION 2010_10 VALUES LESS THAN (1288569600000),
PARTITION 2010_11 VALUES LESS THAN (1291161600000),
PARTITION 2010_12 VALUES LESS THAN (1293840000000),
PARTITION from_2011 VALUES LESS THAN MAXVALUE
);

我收到MySQL错误：ERROR 1503 (HY000): A PRIMARY KEY must include all columns in the table's partitioning function

据我所知，从mysql doc中，分区列应该属于主键。对我来说问题是我想要将PRIMARY_KEY更改为复合的PRIMARY KEY ('id','fk_id','begin')而不更改现有的id列（因为它是在应用程序中用于生成可收藏的URL的字段，因此重新编号ID是不是一种选择）

如何更改PRIMARY_KEY以便我可以进行分区？

Answer 1

我终于找到了办法，我为其他遇到这个问题的人回答

//drop auto_increment capability
alter table table1 change column id id BIGINT NOT NULL;
//in one line, drop primary key and rebuild one
alter table table1 drop primary key, add primary key(id,fk_id,begin);
//re add the auto_increment capability, last value is remembered
alter table table1 change column id id BIGINT NOT NULL AUTO_INCREMENT;
//build the partition
alter table table1 partition by range (begin) ( 
    PARTITION until_2010_07 VALUES LESS THAN (1280620800000), 
    PARTITION 2010_08 VALUES LESS THAN (1283299200000), 
    PARTITION 2010_09 VALUES LESS THAN (1285891200000), 
    PARTITION 2010_10 VALUES LESS THAN (1288569600000), 
    PARTITION 2010_11 VALUES LESS THAN (1291161600000), 
    PARTITION 2010_12 VALUES LESS THAN (1293840000000), 
    PARTITION from_2011 VALUES LESS THAN MAXVALUE 
);

分区确实很容易，但我建议人们在生成实际使用数据库之前创建主键时要考虑它： - ）

我的笔记本电脑每个步骤需要3分钟，然后我必须停止服务以保持数据库的一致性

修改AUTO_INCREMENT PRIMARY KEY进行分区

1 个答案: