SQL 索引自动维护计划脚本

脚本功能:

1，查询数据库中，碎片率在5%以上（官方推荐），有一定数据里的表的索引。

2、如果碎片率在5%<碎片率<=30%  执行重新组织索引。如果在30%以上，执行重建索引

建议在执行前，如果数据库很久没执行过索引重建，建议很将数据库设置为简单模式，不然日志文件会暴涨很多。

create PROCEDURE Index_Auto_RebuildOrReorginze
AS

DECLARE @DBName NVARCHAR(255)
,@TableName NVARCHAR(255)
,@SchemaName NVARCHAR(255)
,@IndexName NVARCHAR(255)
,@PctFrag DECIMAL

DECLARE @Defrag NVARCHAR(MAX)

IF EXISTS (SELECT * FROM sys.objects WHERE OBJECT_ID = OBJECT_ID(N'#Frag'))
DROP TABLE #Frag

CREATE TABLE #Frag
(DBName NVARCHAR(255)
,TableName NVARCHAR(255)
,SchemaName NVARCHAR(255)
,IndexName NVARCHAR(255)
,AvgFragment DECIMAL)

EXEC sp_msforeachdb 'INSERT INTO #Frag (
DBName,
TableName,
SchemaName,
IndexName,
AvgFragment
) SELECT ''?'' AS DBName
,t.Name AS TableName
,sc.Name AS SchemaName
,i.name AS IndexName
,s.avg_fragmentation_in_percent 
FROM ?.sys.dm_db_index_physical_stats(DB_ID(''?''), NULL, NULL,
NULL, ''Sampled'') AS s
JOIN ?.sys.indexes i
ON s.Object_Id = i.Object_id
AND s.Index_id = i.Index_id
JOIN ?.sys.tables t
ON i.Object_id = t.Object_Id
JOIN ?.sys.schemas sc
ON t.schema_id = sc.SCHEMA_ID
WHERE s.avg_fragmentation_in_percent > 5
AND t.TYPE = ''U''
AND s.page_count > 8
ORDER BY TableName,IndexName'

DECLARE cList CURSOR
FOR SELECT * FROM #Frag

OPEN cList
FETCH NEXT FROM cList
INTO @DBName, @TableName,@SchemaName,@IndexName,@PctFrag
WHILE @@FETCH_STATUS = 0
BEGIN
BEGIN TRY
IF @PctFrag BETWEEN 6.0 AND 30.0

BEGIN
SET @Defrag = N'ALTER INDEX ' + @IndexName + ' ON ' + @DBName + '.' + @SchemaName + '.' + @TableName + ' REORGANIZE'
EXEC sp_executesql @Defrag 
PRINT 'Reorganize index: ' + @DBName + '.' + @SchemaName + '.' + @TableName +'.' + @IndexName
END
ELSE IF @PctFrag >30.0
BEGIN
SET @Defrag = N'ALTER INDEX ' + @IndexName + ' ON ' + @DBName + '.' + @SchemaName + '.' + @TableName + ' REBUILD'
EXEC sp_executesql @Defrag
PRINT 'Rebuild index: '+ @DBName + '.' + @SchemaName + '.' + @TableName +'.' + @IndexName
END
END TRY

BEGIN CATCH 
PRINT ERROR_MESSAGE()
END CATCH 

FETCH NEXT FROM cList
INTO @DBName, @TableName,@SchemaName,@IndexName,@PctFrag

END
CLOSE cList
DEALLOCATE cList

DROP TABLE #Frag