解决SQL Server 表或索引的碎片问题
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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