【转】利用optimize、存储过程和系统表对mysql数据库表进行批量碎片清理释放表空间

]命令，对mysql数据表进行空间的释放。由于delete和drop table都不会释放表空间（ truncate 命令会释放表空间【将所有的数据都删除】 ），所以需要利用optimize 命令进行释放。

这个存储过程目的是给一个库的所有表来整理碎片的。一个表随着插入很频繁，或者一直更新不停的，就会积累好多碎片。如果及时整理一下，查询效率会高出好多。

 DELIMITER $$

  DROP   PROCEDURE   IF   EXISTS   `mysql`.`sp_optimize_tables`$$

  CREATE   PROCEDURE   `mysql`.`sp_optimize_tables`(
   IN   db_name   varchar ( 255  ))
  BEGIN 
   --   Created by david yeung 20080128. 

   --   To optimize all the tables in exact database. 

   declare  cnt  int   default   0  ;
    declare  i  int   default   0  ;
    select   count ( * )  as  total  from  information_schema.tables  where  table_schema  =   db_name   into   cnt;
    while  i  <   cnt
  do
      --   Get the table‘s exact name. 
     set   @stmt   =  concat( ‘  select table_name from information_schema.tables where table_schema =   ‘‘‘ , db_name , ‘‘‘   order by table_name asc limit   ‘ ,i, ‘  ,1 into @tb_name  ‘  );
      prepare  s1  from   @stmt  ;
      execute   s1;
      drop   prepare   s1;
      set   @stmt   =   ‘‘  ;
      set   @stmt   =  concat( ‘  optimize table   ‘ , db_name , ‘  .  ‘ , @tb_name  );
      prepare  s1  from   @stmt  ;
      execute   s1;
      drop   prepare   s1;
      set   @stmt   =   ‘‘  ;
      set  i  =  i  +   1  ;
    end   while  ;
    --   Refresh tables. 
 
  flush tables;
  END  $$

DELIMITER ; 

 

调用示例：

mysql> use mysql
Database changed
mysql> call sp_optimize_tables(‘david_test‘);
+------------------------------+----------+----------+----------+
| Table                        | Op       | Msg_type | Msg_text |
+------------------------------+----------+----------+----------+
| david_test.test1 | optimize | status   | OK       |
+------------------------------+----------+----------+----------+
1 row in set (0.26 sec)

+--------------------------+----------+----------+----------+
| Table                    | Op       | Msg_type | Msg_text |
+--------------------------+----------+----------+----------+
| david_test.test2| optimize | status   | OK       |
+--------------------------+----------+----------+----------+
1 row in set (0.35 sec)

+---------------------------------------+----------+----------+----------+
| Table                                 | Op       | Msg_type | Msg_text |
+---------------------------------------+----------+----------+----------+
| david_test.test3 | optimize | status   | OK       |
+---------------------------------------+----------+----------+----------+
1 row in set (0.45 sec)

+--------------------------+----------+----------+----------+
| Table                    | Op       | Msg_type | Msg_text |
+--------------------------+----------+----------+----------+
| david_test.test_article | optimize | status   | OK       |
+--------------------------+----------+----------+----------+
1 row in set (4.13 sec)

...

+----------------------------------+----------+----------+----------+
| Table                            | Op       | Msg_type | Msg_text |
+----------------------------------+----------+----------+----------+
| david_test.test_article_content | optimize | status   | OK       |
+----------------------------------+----------+----------+----------+
1 row in set (37.81 sec)

+-----------------------+----------+----------+----------+
| Table                 | Op       | Msg_type | Msg_text |
+-----------------------+----------+----------+----------+
| david_test.members | optimize | status   | OK       |
+-----------------------+----------+----------+----------+
1 row in set (40.02 sec)

+--------------------+----------+----------+----------+
| Table              | Op       | Msg_type | Msg_text |
+--------------------+----------+----------+----------+
| david_test.test_site | optimize | status   | OK       |
+--------------------+----------+----------+----------+
1 row in set (40.31 sec)

+--------------+----------+----------+----------+
| Table        | Op       | Msg_type | Msg_text |
+--------------+----------+----------+----------+
| david_test.t | optimize | status   | OK       |
+--------------+----------+----------+----------+
1 row in set (41.10 sec)

Query OK, 0 rows affected (41.13 sec)

【转】利用optimize、存储过程和系统表对mysql数据库表进行批量碎片清理释放表空间

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