mysql错误：Row size too large (> 8126).

mysql版本：mysql 5.6
mysql引擎：默认InnoDB
问题缘由：因为一张定义角色信息表有接近300列，而且多数是blog的数据类型，数据存储时报这个错：
Row size too large (> 8126). Changing some columns to TEXT or BLOB or using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help
问题分析：
You may want to take a look at this article which explains a lot about MySQL row sizes. It's important to note that even if you use TEXT or BLOB fields, your row size could still be over 8K (limit for InnoDB) because it stores the first 768 bytes for each field inline in the page.

The simplest way to fix this is to use the Barracuda file format with InnoDB. This basically gets rid of the problem altogether by only storing the 20 byte pointer to the text data instead of storing the first 768 bytes.
解决方法：
一、修改mysql配置文件my.cnf
innodb_file_per_table
innodb_file_format = Barracuda
二、修改形成这个问题的表属性
ALTER TABLE $TABLE
ENGINE=InnoDB
ROW_FORMAT=COMPRESSED
KEY_BLOCK_SIZE=8;
三、重启mysql服务
四、经过写sql语句修改mysql环境配置，能够免重启服务。固然，配置文件中也必须配置上面两个参数，这个操做只是避免这次重启mysql服务
mysql> set global innodb_file_per_table =ON;
mysql> SET GLOBAL innodb_file_format = barracuda;