ReBuilding Indexes Automatically Base On Fragmentation Value

Feb 25, 2008


I am trying to automate my index rebuild and reorg based off of the percentage of fragmentation level. The first time you run it you have to change the alter proce Sp_NCRNRecreate then change it to Alter proc. It seems to run okay no errors but it doesn't seem to actually rebuild them. Please take a look and let me know if you see a program error somewhere. I would like create this sp to run automatically




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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Reorganizing/Rebuilding Index Results In More Fragmentation?

Dec 11, 2007

I have been reworking my index maintenance jobs from my old SQL 2000 table and view references to the DMV's and System Tables in SQL 2005, and I noted that some of my indexes end up being more fragmented after a reorganization and or rebuild. That doesn't make much sense to me at all. The code I am executing is:




Code Block
print ' '
print '************* Beginning Index Updates for '+db_name()+' *************'
print ' '

DECLARE @tablename varchar(250),


@indexname varchar(250),
@fragpcnt decimal(18,1),
@indexid int,
@dbID int

-- Determine DB ID
SELECT @dbID = DB_ID()

DECLARE tnames_cursor CURSOR FOR

SELECT b.name, c.name, a.avg_fragmentation_in_percent, a.index_id
FROM sys.dm_db_index_physical_stats (@dbID, NULL, NULL, NULL, NULL) a

JOIN sys.indexes b ON a.object_id = b.object_id



AND a.index_id = b.index_id
JOIN Sys.objects c ON b.object_id = c.object_id
WHERE a.index_id > 0
ORDER by a.page_count DESC

OPEN tnames_cursor
FETCH NEXT FROM tnames_cursor INTO @indexname, @tablename, @fragpcnt, @indexid
WHILE (@@fetch_status = 0)

BEGIN

-- Declare and determine the tablename ID
declare @tablenameID int
select @tablenameID = object_id(@tablename)



IF @fragpcnt > 30

BEGIN

EXEC('ALTER INDEX ['+@indexname+'] ON ['+@tablename+'] REBUILD')
PRINT '***************************************************'
PRINT 'Index '+@indexname+' was rebuilt.'
PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'


SELECT @fragpcnt = avg_fragmentation_in_percent
FROM sys.dm_db_index_physical_stats (@dbID, @tablenameID, @indexid, NULL, NULL) a

JOIN sys.indexes b ON a.object_id = b.object_id



AND a.index_id = b.index_id
JOIN Sys.objects c ON b.object_id = c.object_id

PRINT 'Post Rebuild fragmentation Percent: ' + convert(varchar, @fragpcnt) + '%'
PRINT ''
END
ELSE IF @fragpcnt BETWEEN 5 AND 30

BEGIN

EXEC('ALTER INDEX ['+@indexname+'] ON ['+@tablename+'] REORGANIZE')
PRINT '***************************************************'
PRINT 'Index '+@indexname+' was Reorganized.'
PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'

SELECT @fragpcnt = avg_fragmentation_in_percent
FROM sys.dm_db_index_physical_stats (@dbID, @tablenameID, @indexid, NULL, NULL) a

JOIN sys.indexes b ON a.object_id = b.object_id



AND a.index_id = b.index_id
JOIN Sys.objects c ON b.object_id = c.object_id

PRINT 'Post Reorganization fragmentation Percent: ' + convert(varchar, @fragpcnt) + '%'
PRINT ''
END
ELSE

BEGIN

PRINT '***************************************************'
PRINT 'Index '+@indexname+' was left alone.'
PRINT 'Original framentation Percent: ' + convert(varchar, @fragpcnt) + '%'
PRINT ''
END
FETCH NEXT FROM tnames_cursor INTO @indexname, @tablename, @fragpcnt, @indexid
END
print ' '
print '************* NO MORE TABLES TO INDEX *************'
PRINT 'All indexes for the '+db_name()+' database have been updated.'
print ' '
DEALLOCATE tnames_cursor





Below are some snipits of the output:


***************************************************
Index _dta_index_wuci_history_8_1123587141__K2_K5 was rebuilt.
Original framentation Percent: 58.3%
Post Rebuild fragmentation Percent: 58.3%

***************************************************
Index PK__batchjob__776C5C84 was left alone.
Original framentation Percent: 0.0%

***************************************************
Index PK__ContactWebDetail__116A8EFB was rebuilt.
Original framentation Percent: 44.4%
Post Rebuild fragmentation Percent: 77.8%

***************************************************
Index PK__managed_object_s__5DCAEF64 was left alone.
Original framentation Percent: 0.0%

***************************************************
Index kb_IX_kb_scope_scope_role was rebuilt.
Original framentation Percent: 75.0%
Post Rebuild fragmentation Percent: 87.5%

***************************************************
Index PK__query__09A971A2 was left alone.
Original framentation Percent: 0.0%

***************************************************
Index PK__email_message__38996AB5 was rebuilt.
Original framentation Percent: 85.7%
Post Rebuild fragmentation Percent: 0.0%

***************************************************






If the index begins with PK, then it is the primary key index which is generally the clustered index on the table, but not always. If it has an IX on it, it is generally a non-clustered index on the table, but again not always. In the case of the above, the PK is a clustered index, and the IX is a non-clustered index.

Anyone have any ideas why this is functioning in this manner?

Thanks,

Jon

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Jan 14, 2002

Hi!
I was wondering what kind of locks (if any) SQL Server 2000 holds on tables while rebuilding clustered and non-clustered indexes.

Thanks!

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Do anyone know how to rebuild indexes on the maintenance plan??
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All,

I have scheduled dbreindex command to run on an clustered indexed on a very large table over night, so far this as failed to complete successfully. I think it may have something to do with the amount of space available in the device; the table is approx 238mb in size and the available disk space left in the device is 200 mb.

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Or even better, if anyone can explain the inter-workings of how the dbreindex command reorgs the table.

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Hello all,

I need to diagnose a problem, this Sunday a regular Database Maintenance plan which is supposed to rebuild indexes took exactly 6 hours and 32 minutes. Now that’s a hell lot of time and during all that process users were denied access to those tables. This is a production server. I want to know what caused that plan to run for so long and how can I avoid this to happen again plus if it ever happens again how can I make sure that atleast it doesn’t lock tables. I know DBCC INDEXDEFRAG doesn’t lock tables but how can I make Database Maintenance plan to run DBCC INDEXDEFRAG instead of DBCC DBREINDEX but more importantly why it took 6 hours.

Thanks all

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Jan 14, 2002

(Oops, sorry I posted this on the SQL 7 discussion earlier).

----------------------
I was wondering what kind of locks (if any) SQL Server 2000 holds on tables while rebuilding clustered and non-clustered indexes.

Thanks!

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Hello all,

I need to diagnose a problem, this Sunday a regular Database Maintenance plan which is supposed to rebuild indexes took exactly 6 hours and 32 minutes. Now that’s a hell lot of time and during all that process users were denied access to those tables. This is a production server. I want to know what caused that plan to run for so long and how can I avoid this to happen again plus if it ever happens again how can I make sure that atleast it doesn’t lock tables. I know DBCC INDEXDEFRAG doesn’t lock tables but how can I make Database Maintenance plan to run DBCC INDEXDEFRAG instead of DBCC DBREINDEX but more importantly why it took 6 hours.

Thanks all

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Hello,

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Hi,

I have recenlty had to rebuild the indexes for the entire database as they were running a little slow. It prompted me to further investigate the health of the indexes on the database. I have been using the sys.dm_db_index_physical_stats view to do this. I had a query with regards to the avg_fragmentation_in_percent column that the view displays. I have rebuilt all the indexes and for some of the indexes the fragmentation value remains the same. The following is an example of what is returned by the sys.dm_db_index_physical_stats for a single index:

Table, IndexName, avg_fragmentation_in_percent, avg_page_space_used_in_percent
Links, PK_Links, 77.7777777777778, 97.1501606127996
Links, PK_Links, 0, 1.42080553496417

I do not understand why this index the fragmentation is so high even though I have rebuilt it. It is not just this index it occurs for other indexes as well. What could be some of the factors that are causing this to occur?

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Hi all,
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Before rebuilding the indexes , the size of the database = 385 Gb
After rebuilding the indexes, the size jumps to = 572 Gb (i.e.) This means 187 Gb of unallocated space .

The Command use to rebuild indexes is:
USE [databasename]
GO
ALTER INDEX [PK_index] ON [dbo].[tablename] REBUILD WITH
( PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON, SORT_IN_TEMPDB = ON, ONLINE = OFF )
GO

So, every time we rebuild indexes, we have to shrink the database
(or)
Is there anything else ,I should be doing.
Thanks.

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