MySQL: OPTIMIZE TABLE: Table does not support optimize, doing recreate + analyze instead

show create table history;
--------------------------
 CREATE TABLE `foo` (
  `itemid` bigint(20) unsigned NOT NULL,
  `clock` int(11) NOT NULL DEFAULT '0',
  `value` double(16,4) NOT NULL DEFAULT '0.0000',
  `ns` int(11) NOT NULL DEFAULT '0',
  KEY `history_1` (`itemid`,`clock`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

mysql> OPTIMIZE TABLE history;
+----------+----------+----------+-------------------------------------------------------------------+
| Table    | Op       | Msg_type | Msg_text                                                          |
+----------+----------+----------+-------------------------------------------------------------------+
| test.foo | optimize | note     | Table does not support optimize, doing recreate + analyze instead |
| test.foo | optimize | status   | OK                                                                |
+----------+----------+----------+-------------------------------------------------------------------+


這里mysql給的提示是

Note>> Table does not support optimize, doing recreate + analyze instead 
Status>> OK
也就是說 optimize table 對於innodb來說，無法作為a single operation，實際的操作是：

ALTER TABLE test.foo ENGINE=InnoDB;
ANALYZE TABLE test.foo;

   MySQL5.7已經推薦對於InnoDB的table使用 alter table table_name engine=innodb;語句的方式來進行表碎片優化。

 

  底層實現的不同，參考：https://dev.mysql.com/doc/refman/5.7/en/optimize-table.html