mysql錯誤：Row size too large ( 8126).

mysql版本：mysql 5.6
mysql引擎：默認InnoDB
問題原因：由於一張定義角色信息表有接近300列，並且多數是blog的數據類型，數據存儲時報這個錯：

Row size too large (> 8126). Changing some columns to TEXT or BLOB or
using ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED may help

問題分析：

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.

解決方法：
1、修改mysql配置文件my.cnf

innodb_file_per_table
innodb_file_format = Barracuda

2、修改造成這個問題的表屬性

ALTER TABLE $TABLE
ENGINE=InnoDB
ROW_FORMAT=COMPRESSED 
KEY_BLOCK_SIZE=8;

3、重啓mysql服務
4、通過寫sql語句修改mysql環境配置，可以免重啓服務。當然，配置文件中也必須配置上面兩個參數，這個操作只是避免此次重啓mysql服務
mysql> set global innodb_file_per_table =ON;
mysql> SET GLOBAL innodb_file_format = barracuda;