网站建设资讯

NEWS

网站建设资讯

如何解决mysql添加分区出错的问题

这篇文章主要介绍如何解决MySQL添加分区出错的问题,文中介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们一定要看完!

创新互联公司是一家集网站建设,贵南企业网站建设,贵南品牌网站建设,网站定制,贵南网站建设报价,网络营销,网络优化,贵南网站推广为一体的创新建站企业,帮助传统企业提升企业形象加强企业竞争力。可充分满足这一群体相比中小企业更为丰富、高端、多元的互联网需求。同时我们时刻保持专业、时尚、前沿,时刻以成就客户成长自我,坚持不断学习、思考、沉淀、净化自己,让我们为更多的企业打造出实用型网站。

mysql添加分区出错,报“1503”错误的原因:每一个分区表中的公式中的列,必须在主键“unique key”中包括,否则就报错;解决方法:先使用“PRIMARY KEY”关键字创建一个复合主键,将分区字段加入到主键中,再进行分区操作。

如果分区字段没有包含在主键字段内,如表A的主键为ID,分区字段为createtime ,按时间范围分区,代码如下:

CREATE TABLE T1 (
     id int(8) NOT NULL AUTO_INCREMENT,
     createtime datetime NOT NULL,
      PRIMARY KEY (id)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
PARTITION BY RANGE(TO_DAYS (createtime))
(
PARTITION p0 VALUES LESS THAN (TO_DAYS('2010-04-15')),
PARTITION p1 VALUES LESS THAN (TO_DAYS('2010-05-01')),
PARTITION p2 VALUES LESS THAN (TO_DAYS('2010-05-15')),
PARTITION p3 VALUES LESS THAN (TO_DAYS('2010-05-31')),
PARTITION p4 VALUES LESS THAN (TO_DAYS('2010-06-15')),
PARTITION p19 VALUES LESS ThAN  MAXVALUE);

错误提示:#1503

A PRIMARY KEY MUST INCLUDE ALL COLUMNS IN THE TABLE'S PARTITIONING FUNCTION

MySQL主键的限制,每一个分区表中的公式中的列,必须在主键“unique key”中包括

在MYSQL的官方文档里是这么说明的

18.5.1. Partitioning Keys, Primary Keys, and Unique Keys

This section discusses the relationship of partitioning keys with primary keys and unique keys. The rule governing this relationship can be expressed as follows: All columns used in the partitioning expression for a partitioned table must be part of every unique key that the table may have.

In other words,every unique key on the table must use every columnin the table's partitioning expression. (This also includes the table's primary key, since it is by definition a unique key. This particular case is discussed later in this section.) For example, each of the following table creation statements is invalid:

分区字段必须包含在主键字段内,至于为什么MYSQL会这样考虑,CSDN的斑竹是这么解释的:

为了确保主键的效率。否则同一主键区的东西一个在A分区,一个在B分区,显然会比较麻烦。 copyright

下面讨论解决办法,毕竟在一张表里,日期做主键的还是不常见。

方法1:

顺应MYSQL的要求,就把分区字段加入到主键中,组成复合主键

CREATE TABLE T1 (
     id int(8) NOT NULL AUTO_INCREMENT,
     createtime datetime NOT NULL,
      PRIMARY KEY (id,createtime)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
PARTITION BY RANGE(TO_DAYS (createtime))
(
PARTITION p0 VALUES LESS THAN (TO_DAYS('2010-04-15')),
PARTITION p1 VALUES LESS THAN (TO_DAYS('2010-05-01')),
PARTITION p2 VALUES LESS THAN (TO_DAYS('2010-05-15')),
PARTITION p3 VALUES LESS THAN (TO_DAYS('2010-05-31')),
PARTITION p4 VALUES LESS THAN (TO_DAYS('2010-06-15')),
PARTITION p19 VALUES LESS ThAN  MAXVALUE);

测试通过,分区成功。

方法2:

既然MYSQL要把分区字段包含在主键内才能创建分区,那么在创建表的时候,先不指定主键字段,是否可以呢??

测试如下:

CREATE TABLE T1 (
     id int(8) NOT NULL ,
     createtime datetime NOT NULL
      ) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8
PARTITION BY RANGE(TO_DAYS (createtime))
(
PARTITION p0 VALUES LESS THAN (TO_DAYS('2010-04-15')),
PARTITION p1 VALUES LESS THAN (TO_DAYS('2010-05-01')),
PARTITION p2 VALUES LESS THAN (TO_DAYS('2010-05-15')),
PARTITION p3 VALUES LESS THAN (TO_DAYS('2010-05-31')),
PARTITION p4 VALUES LESS THAN (TO_DAYS('2010-06-15')),
PARTITION p19 VALUES LESS ThAN  MAXVALUE);

测试通过,分区成功。OK copyright

继续添加上主键

alter table t1 add PRIMARY KEY(ID)

错误1503,和前面一样的错误。

alter table t1 add PRIMARY KEY(ID,createtime)

创建主键成功,但还是复合主键,看来是没办法了,必须听指挥了。

主键创建成功,把ID加上自增字段设置

alter table t1 change id id int not null auto_increment;
alter table t1 auto_increment=1;

最后结论,MYSQL的分区字段,必须包含在主键字段内。

以上是如何解决mysql添加分区出错的问题的所有内容,感谢各位的阅读!希望分享的内容对大家有帮助,更多相关知识,欢迎关注创新互联行业资讯频道!


网站题目:如何解决mysql添加分区出错的问题
标题来源:http://cdweb.net/article/ipioco.html