SQL Server 数据库索引整理语句,自动整理数据库索引

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在一个大型数据库中，数据的更改是非常频繁的。
而建立在这些数据上的索引也是需要经常去维护的。
否则这这些数据索引就起不到起应起的作用。甚至会成为数据库本身的负担。
我们就要定期的对数据库的索引进行维护 我在MSDN上发现了这个脚本不过其中有些小问题我已经修正 大家可以使用这个脚本对数据库的索引进行日常维护

代码如下:

SET NOCOUNT ON; 
DECLARE @objectid int; 
DECLARE @indexid int; 
DECLARE @partitioncount bigint; 
DECLARE @schemaname sysname; 
DECLARE @objectname sysname; 
DECLARE @indexname sysname; 
DECLARE @partitionnum bigint; 
DECLARE @partitions bigint; 
DECLARE @frag float; 
DECLARE @command varchar(8000); 
DECLARE @dbId int; 
-- ensure the temporary table does not exist 
IF EXISTS (SELECT name FROM sys.objects WHERE name = 'work_to_do') 
DROP TABLE work_to_do; 
-- conditionally select from the function, converting object and index IDs to names. 
set @dbId=DB_ID(); 
SELECT 
object_id AS objectid, 
index_id AS indexid, 
partition_number AS partitionnum, 
avg_fragmentation_in_percent AS frag 
INTO work_to_do FROM sys.dm_db_index_physical_stats (@dbId, NULL, NULL , NULL, 'LIMITED') 
WHERE avg_fragmentation_in_percent > 10.0 AND index_id > 0; 
-- Declare the cursor for the list of partitions to be processed. 
DECLARE partitions CURSOR FOR SELECT * FROM work_to_do; 

-- Open the cursor. 
OPEN partitions; 

-- Loop through the partitions. 
FETCH NEXT 
FROM partitions 
INTO @objectid, @indexid, @partitionnum, @frag; 

WHILE @@FETCH_STATUS = 0 
BEGIN; 
SELECT @objectname = o.name, @schemaname = s.name 
FROM sys.objects AS o 
JOIN sys.schemas as s ON s.schema_id = o.schema_id 
WHERE o.object_id = @objectid; 

SELECT @indexname = name 
FROM sys.indexes 
WHERE object_id = @objectid AND index_id = @indexid; 

SELECT @partitioncount = count (*) 
FROM sys.partitions 
WHERE object_id = @objectid AND index_id = @indexid; 

-- 30 is an arbitrary decision point at which to switch between reorganizing and rebuilding 
IF @frag < 30.0 
BEGIN; 
SELECT @command = 'ALTER INDEX [' + @indexname + '] ON ' + @schemaname + '.[' + @objectname + '] REORGANIZE'; 
IF @partitioncount > 1 
SELECT @command = @command + ' PARTITION=' + CONVERT (CHAR, @partitionnum); 

EXEC (@command); 
END; 

IF @frag >= 30.0 
BEGIN; 
SELECT @command = 'ALTER INDEX [' + @indexname +'] ON ' + @schemaname + '.[' + @objectname + '] REBUILD'; 
IF @partitioncount > 1 
SELECT @command = @command + ' PARTITION=' + CONVERT (CHAR, @partitionnum); 

EXEC (@command); 
END; 
PRINT 'Executed ' + @command; 

FETCH NEXT FROM partitions INTO @objectid, @indexid, @partitionnum, @frag; 
END; 
-- Close and deallocate the cursor. 
CLOSE partitions; 
DEALLOCATE partitions; 

-- drop the temporary table 
IF EXISTS (SELECT name FROM sys.objects WHERE name = 'work_to_do') 
DROP TABLE work_to_do; 
GO 

这个脚本在运行时 会建立一个表 work_to_do 整理完毕后会自动删除这个表。如果大家不喜欢这样的话也可以用 一个 临时表解决 .

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关键词：SQL SERVER