我们目前正在将 MySQL 与 innodb 结合使用,并且我们有一些行格式紧凑的大表。当我将行格式更改为压缩时,我们仍然看到表格的大小相同。有人知道这是什么原因吗?
最佳答案
是否有可能您为表声明了 ROW_FORMAT=COMPRESSED,但您没有启用配置值 innodb_file_format=BARRACUDA?
如果您不执行后一步,则对梭子鱼行格式的任何请求都不会生效。这样的请求会产生警告:
mysql> alter table foo row_format=compressed;
Query OK, 0 rows affected, 2 warnings (0.03 sec)
Records: 0 Duplicates: 0 Warnings: 2
mysql> show warnings;
+---------+------+-----------------------------------------------------------------------+
| Level | Code | Message |
+---------+------+-----------------------------------------------------------------------+
| Warning | 1478 | InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_format > Antelope. |
| Warning | 1478 | InnoDB: assuming ROW_FORMAT=COMPACT. |
+---------+------+-----------------------------------------------------------------------+
此外,除非您还启用 innodb_file_per_table
,否则您不能使用压缩行格式。
mysql> alter table foo row_format=compressed;
Query OK, 0 rows affected, 2 warnings (0.03 sec)
Records: 0 Duplicates: 0 Warnings: 2
mysql> show warnings;
+---------+------+---------------------------------------------------------------+
| Level | Code | Message |
+---------+------+---------------------------------------------------------------+
| Warning | 1478 | InnoDB: ROW_FORMAT=COMPRESSED requires innodb_file_per_table. |
| Warning | 1478 | InnoDB: assuming ROW_FORMAT=COMPACT. |
+---------+------+---------------------------------------------------------------+
关于mysql - 为什么在更改行格式时我的表大小没有减小?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/13636358/