mysql 8126

Posted 2021-02-01 moss_tan_jun

注意：

1） 修改后的innodb_file_format格式， 只影响后续创建的表。 也就是后续创建的表，可以支持把row_format设为dynamic，之前创建的表仍然会报错

2） SET GLOBAL 只是在mysql服务器运行期间有效，重启后innodb_file_format还原为原来的格式。

3） 判断一个表是否支持超过10个blob的字段的简单办法： show table status like ‘t1‘ G 查看 Row_format ， 如果是Compact， 必定不支持， 如果是dynamic， 则支持。

 

Hello All 

I have encounterd a problem on engine conversion from myisam to innodb, it shows error like: 

ERROR 1118 (42000): Row size too large (> 8126). Changing some columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help. In current row format, BLOB prefix of 768 bytes is stored inline. 

To resolve following issue , i have change on my.cnf. 

my.cnf 
innodb_file_format = Barracuda 
innodb_file_per_table = 1 

and used on alter command. 
Alter table <table_name> engine=innodb ROW_FORMAT=DYNAMIC; 

It solves my issue but our team concern about the performance,security and possible error arise after following changes. 

So i reqest all of you , can any one please suggest me the better alternavite solution for current issue , and what will be the performance impact on this changes. 

thanks in advance.