MySQL错误“Specified key was too long; max key length is 1000 bytes”
2017-02-28 17:12
393 查看
建立索引时,数据库计算key的长度是累加所有Index用到的字段的char长度后再按下面比例乘起来不能超过限定的key长度1000:
latin1 = 1 byte = 1 character
uft8 = 3 byte = 1 character
gbk = 2 byte = 1 character
举例能看得更明白些,以GBK为例:
CREATE UNIQUE INDEX `unique_record` ON reports (`report_name`, `report_client`, `report_city`);
其中report_name varchar(200), report_client varchar(200), report_city varchar(200)
(200 + 200 +200) * 2 = 1200 > 1000,所有就会报1071错误,只要将report_city改为varchar(100)那么索引就能成功建立。
如果表是UTF8字符集,那索引还是建立不了。
latin1 = 1 byte = 1 character
uft8 = 3 byte = 1 character
gbk = 2 byte = 1 character
举例能看得更明白些,以GBK为例:
CREATE UNIQUE INDEX `unique_record` ON reports (`report_name`, `report_client`, `report_city`);
其中report_name varchar(200), report_client varchar(200), report_city varchar(200)
(200 + 200 +200) * 2 = 1200 > 1000,所有就会报1071错误,只要将report_city改为varchar(100)那么索引就能成功建立。
如果表是UTF8字符集,那索引还是建立不了。
相关文章推荐
- MySQL错误“Specified key was too long; max key length is 1000 bytes”的解决办法
- MySQL错误“Specified key was too long; max key length is 1000 bytes”的解决办法
- MySQL错误“Specified key was too long; max key length is 1000 bytes”的解决办
- 执行nova-manage db sync时出错,提示’Specified key was too long; max key length is 1000 bytes’
- Mysql: Specified key was too long; max key length is 1000 bytes
- laravel错误1071 Specified key was too long; max key length is 1000 bytes
- laravel错误1071 Specified key was too long; max key length is 1000 bytes
- Mysql::Error: Specified key was too long; max key length is 1000 bytes
- mysql建库时提示Specified key was too long max key length is 1000 bytes的问题的解决方法
- Specified key was too long; max key length is 1000 bytes
- 1071 Specified key was too long; max key length is 1000 bytes
- Using innodb_large_prefix to avoid ERROR #1071,Specified key was too long; max key length is 1000 bytes
- laravel migrate错误1071 Specified key was too long; max key length is 1000 bytes
- MySQL错误“Specified key was too long; max key length is 1000 bytes”
- 【MySQL】activiti 创建23张表报错,Specified key was too long; max key length is 1000 bytes
- Using innodb_large_prefix to avoid ERROR #1071,Specified key was too long; max key length is 1000 bytes
- hive异常:创建MySQL时Specified key was too long; max key length is 1000 bytes
- MySQL错误“Specified key was too long; max key length is 1000 bytes”的解决办法
- laravel错误1071 Specified key was too long; max key length is 1000 bytes
- mysql建库时提示Specified key was too long max key length is 1000 bytes的问题的解决方法