使用OPTIMIZE TABLE命令优化MySQL表-
optimize table yourTableName;
让我们首先创建一个表-
mysql> create table DemoTable( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(100) );
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable(Name) values('Chris'); mysql> insert into DemoTable(Name) values('Robert'); mysql> insert into DemoTable(Name) values('Bob'); mysql> insert into DemoTable(Name) values('David');
使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+----+--------+ | Id | Name | +----+--------+ | 1 | Chris | | 2 | Robert | | 3 | Bob | | 4 | David | +----+--------+ 4 rows in set (0.00 sec)
现在让我们从表中删除行-
mysql> delete from DemoTable where Id IN(1,3); mysql> select *from DemoTable; +----+--------+ | Id | Name | +----+--------+ | 2 | Robert | | 4 | David | +----+--------+ 2 rows in set (0.00 sec)
以下是优化上面和删除一些行后创建的表的查询-
mysql> optimize table DemoTable;
这将产生以下输出-
+------------------+----------+----------+-------------------------------------------------------------------+ | Table | Op | Msg_type | Msg_text | +------------------+----------+----------+-------------------------------------------------------------------+ | web.DemoTable | optimize | note | Table does not support optimize, doing recreate + analyze instead | | web.DemoTable | optimize | status | OK | +------------------+----------+----------+-------------------------------------------------------------------+ 2 rows in set (4.32 sec)