mysql錯誤：Row size too large (> 8126).

mysql版本：mysql 5.6
mysql引擎：默認InnoDB
問題緣由：因爲一張定義角色信息表有接近300列，而且多數是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：
一、修改mysql配置文件my.cnf
innodb_file_per_table
innodb_file_format = Barracuda
二、修改形成這個問題的表屬性
ALTER TABLE $TABLE
ENGINE=InnoDB
ROW_FORMAT=COMPRESSED
KEY_BLOCK_SIZE=8;
三、重啓mysql服務
四、經過寫sql語句修改mysql環境配置，能夠免重啓服務。固然，配置文件中也必須配置上面兩個參數，這個操做只是避免這次重啓mysql服務
mysql> set global innodb_file_per_table =ON;
mysql> SET GLOBAL innodb_file_format = barracuda;