UPDATE table_name d SET d.column_name='aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa' WHERE d.ID=100976;
报错信息如下: Error Code : 1118 Row size too large. The maximum row size for the used table type, not counting BLOBs, is 8126. You have to change some columns to TEXT or BLOBs 疑惑: 更新字段只涉及 column_name字段,且该字段是TEXT类型。
个人之前理解是: TEXT的内容在 Dynamic的table format下是存在off-page中的,不会占用row size的计算。 Barracuda 对应row_format ( dynamic, compress) ,其中dynamic下text的所有内容都是off-page存放的 (点击查看) Antelope 对应row_format (compact, redundant),其中compact下的text是存786B在row中,超过部分存在off-page 而服务器配置是 innodb_file_format = Barracuda 照理说所有table用的都是 dynamic 结构。 但是! 原因如下,摘自文档: To preserve compatibility with those prior versions, tables created with the InnoDB Plugin use the prefix format, unless one of ROW_FORMAT=DYNAMIC or ROW_FORMAT=COMPRESSED is specified (or implied) on the CREATE TABLE command. 也就是说,建表时不显示指定 row_format = dynamic ,即使 innodb_file_format = Barracuda 表的row-format还是 compact