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解决SQL Server 表或索引的碎片问题

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Release: 2016-06-07 16:21:33
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对表进行长期的修改或删除会产生大量的碎片,影响数据库性能。解决办法就是把表或索引重建,消除碎片,达到优化的目的。 直接上代码: /*查询碎片,avg_fragmentation_in_percent就是索引占的百分比,大于30都是不正常的,需要重建*/ DECLARE @db_id int; DE

   对表进行长期的修改或删除会产生大量的碎片,影响数据库性能。解决办法就是把表或索引重建,消除碎片,达到优化的目的。

  直接上代码:

  /*查询碎片,avg_fragmentation_in_percent就是索引占的百分比,大于30都是不正常的,,需要重建*/

  DECLARE @db_id int;

  DECLARE @object_id int;

  SET @db_id = DB_ID(N'AdventureWorks2008R2');

  SET @object_id = OBJECT_ID(N'AdventureWorks2008R2.Person.Address');

  IF @db_id IS NULL

  BEGIN;

  PRINT N'Invalid database';

  END;

  ELSE IF @object_id IS NULL

  BEGIN;

  PRINT N'Invalid object';

  END;

  ELSE

  BEGIN;

  SELECT * FROM sys.dm_db_index_operational_stats(@db_id, @object_id, NULL, NULL);

  END;

  GO

  /*重建表*/

  alter table rebuild

  /*重建索引*/

  alter index ON rebuild

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