How To Find Fragmentation Of Indexes

Mar 27, 2008

Hi

I try to find the percentage of fragmentation in the perticular table using the following table. For some tables it is getting the results but for some database tables it is saying the error in qurey even if I use same query. Is there any reason for that. Or is there any other way to find out the fragmentation of table. any help would be fine. Thanks!


SELECT a.index_id, name, avg_fragmentation_in_percent

FROM sys.dm_db_index_physical_stats (DB_ID(), OBJECT_ID(N'schema.tablename),

NULL, NULL, NULL) AS a

JOIN sys.indexes AS b ON a.object_id = b.object_id AND a.index_id = b.index_id;

GO

And is there any way to find out when did index rebuild occurs in perticular index or table. Thank you very much.

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use master

GO

Alter PROC sp_NCR_RecreateIndexes @AutoRun bit=0 AS

BEGIN

DECLARE @DatabaseName varchar(128), @SchemaName varchar(128), @objectName varchar(128), @IndexName varchar(128), @PercentFragmented float, @command varchar(max)



SELECT db_name(s.database_id) as DatabaseName, schema_name(o.schema_id) as SchemaName, o.name as TableName, i.name as IndexName, s.avg_fragmentation_in_percent AS PercentFragmented

INTO #IndexesToRebuild

FROM sys.dm_db_index_physical_stats (db_id(), Null, NULL, NULL, NULL) s

INNER JOIN sys.objects o ON s.object_id=o.object_id

INNER JOIN sys.indexes i ON s.object_id=i.object_id AND s.index_id=i.index_id

WHERE s.avg_fragmentation_in_percent > 10.0 AND s.index_id > 0

SELECT * FROM #IndexesToRebuild



DECLARE IndexCursor CURSOR FOR SELECT DatabaseName, SchemaName, TableName, IndexName, PercentFragmented FROM #IndexesToRebuild

OPEN IndexCursor

FETCH IndexCursor INTO @DatabaseName, @SchemaName, @objectName, @IndexName, @PercentFragmented

WHILE @@FETCH_STATUS=0

BEGIN

SELECT @command = 'ALTER INDEX ' + @indexname +' ON ' + @databaseName + '.' + @schemaname + '.' + @objectName + CASE WHEN @PercentFragmented<30 THEN ' REORGANIZE' ELSE ' REBUILD' END;

print @command

IF @AutoRun=1

EXEC(@command)

FETCH IndexCursor INTO @DatabaseName, @SchemaName, @objectName, @IndexName, @PercentFragmented

END

--SELECT * FROM #IndexStats

END

GO

EXEC sys.sp_MS_marksystemobject sp_NCR_RecreateIndexes

GO

EXEC otis..sp_NCR_RecreateIndexes

EXEC ncrCommon..sp_NCR_RecreateIndexes

GO

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- Extents Scanned..............................: 13124
- Extent Switches..............................: 13123
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- Avg. Bytes Free per Page.....................: 7757.4
- Avg. Page Density (full).....................: 4.16%

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:-)

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SELECT a.database_id

,a.object_id

,a.index_id

,b.name

,a.avg_fragmentation_in_percent

FROM sys.dm_db_index_physical_stats (7,NULL, NULL, NULL, NULL) AS a

JOIN sys.indexes AS b

ON a.object_id = b.object_id

AND a.index_id = b.index_id

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SQL Server 2005 EE SP 2

Thanks,
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