innodb_large_prefix
Prefixes, defined by the length attribute, can be up to 767 bytes long for InnoDB tables or 3072 bytes if the innodb_large_prefix option is enabled.
mysql> show variables like ‘innodb_large_prefix’ +———————+——-+ | Variable_name | Value | +———————+——-+ | innodb_large_prefix | OFF | +———————+——-+ 1 row in set (0.00 sec)
3. 修改innodb_large_prefix = 1 ,innodb_file_format= BARRACUDA参数 ,
对row_format为dynamic格式 ,可以指定索引列长度大于767 bytes。但是索引列总长度的不能大于3072 bytes的限制仍然存在
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