如何在删除一些行后优化 MySQL 表?
mysqlmysqli database更新于 2025/11/3 5:00:17
使用 OPTIMIZE TABLE 命令优化 MySQL 表 −
optimize table yourTableName;
首先我们创建一个表 −
mysql> create table DemoTable( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, Name varchar(100) ); Query OK, 0 rows affected (1.38 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable(Name) values('Chris');
Query OK, 1 row affected (0.27 sec)
mysql> insert into DemoTable(Name) values('Robert');
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable(Name) values('Bob');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable(Name) values('David');
Query OK, 1 row affected (0.38 sec)
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); Query OK, 2 rows affected (0.29 sec) mysql> select *from DemoTable; +----+--------+ | Id | Name | +----+--------+ | 2 | Robert | | 4 | David | +----+--------+ 2 rows in set (0.00 sec)
以下是优化上面创建的表并删除一些行后的查询 −
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)
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