Mysql Specified key was too long; max key length is 767 bytes

Posted 2021-12-10 wang-yaz

导致这个问题的原因索引的字段都太长了，mysql受不了，解决方法就是，让mysql支持比较长的索引,然后在插入表的时候，添加ROW_FORMAT=DYNAMIC ，自动格式化索引。

ERROR 1071 (42000): Specified key was too long; max key length is 767 bytes

查看数据库信息

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show variables like ‘innodb_large_prefix‘;  show variables like ‘innodb_file_format‘;   --修改最大索引长度限制 set global innodb_large_prefix=1; set global innodb_file_format=BARRACUDA; -- 添加 set global innodb_file_format_max=BARRACUDA;

2、修改插入sql的语句添加ROW_FORMAT=DYNAMIC

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create table idx_length_test_02 (   id int auto_increment primary key,   name varchar(255) ) ROW_FORMAT=DYNAMIC default charset utf8mb4;