MySQL 報錯：[Err] 1071 - Specified key was too long; max key length is 767 bytes

[Err] 1071 - Specified key was too long; max key length is 767 bytes

 

 

這個會出現在MySQ5.7以下版本 因為沒有啟用innodb_large_prefix

MySQL 5.6：

 

 

 MySQL 5.7：

 

簡單辦法：如果要求不是很高 ，也可以直接把表字段varchar(255)設置為varchar(64) 

 

 

另外一種：修改配置 （重啟服務會失效）

mysql> show variables like '%innodb_large_prefix%';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| innodb_large_prefix | OFF   |
+---------------------+-------+
1 row in set

mysql> set global innodb_large_prefix=on;
Query OK, 0 rows affected

mysql> show variables like '%innodb_large_prefix%';
+---------------------+-------+
| Variable_name       | Value |
+---------------------+-------+
| innodb_large_prefix | ON    |
+---------------------+-------+
1 row in set