Indexes Showing Fragmentation Percentage As 99%

Oct 20, 2015

I have rebuilded indexes and some of the indexes still showing fragmentation percentage as 99%. I have cross checked page count for these indexes and they are more than 10000 pages.As i am aware if the page count is less we can ignore this percentage. But in my case the page count is 10000.

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Percentage Of Fragmentation Increased After 6 Hours?

Aug 14, 2015

Yesterday night, I rebuilded all indexes one a table since they were having high percentage of fragmentation . After rebuilding, I immediately checked the fragmentation percentage and it got reduced and I felt happy. However, when i saw the percentage of fragmentation after 6 hours, it increased from 1% to 48%. How to find what caused the increase and how to fix it.

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DB Engine :: Fragmentation Percentage - Page Count Is 300 Only

Jan 22, 2015

What is the impact of fragmentation when my tables fragmentation is 99% but page count is 300 only?

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Index Showing Fragmentation

May 11, 2015

We have nightly job running to reorg all in one of our prod database. But the index on one of the table fragmenting quickly by the morning showing 90% fragmentation.

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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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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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DB Engine :: Fragmentation % Of Indexes Remain Same After Reorg

Oct 21, 2015

I have an issue with fragmentation SQl server 2012 .I monitored indexes using sys.dm_db_index_physical_stats. fragmented % is still remain after re-organized the index.

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Transact SQL :: Fragmentation Levels Of All The Clustered Column-store Indexes In A Database?

Sep 18, 2015

I have a  database in which I have  some tables in which I have implemented Clustered columnstore Index. How to find the fragmentation levels of all these indexes via  a single T-SQl script

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DB Design :: Indexes Showing Up As Statistics?

Jul 15, 2015

I have a series of indexes that are showing as statistics. Is it because they are filtered or are defined as constraints?

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Removal Of Selected Indexes / Script Index Create For List Of Indexes

Jul 1, 2014

I'm working to improve performance on a database I've inherited, and there are several thousand indexes. I've got a list of ones which should definitely exist within the database, and I'm looking to strip out all the others and start fresh, though this list is still quite large (1000 or so).

Is there a way I can remove all the indexes that are not in my list without too much trouble? I.e. without having to manually go through them all individually. The list is currently in a csv file.

I'm looking to either automate the removal of indexes not in the list, or possibly to generate the Create statements for the indexes on the list and simply remove all indexes and then run these statements.

As an aside, when trying to list all indexes in the database, I've found various scripts to do this, but found they all seem to produce differing results. What is the best script to list all indexes?

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Fragmentation

May 13, 2008

 i want to do fragmentation using SQL 2005 Express. Can their be any helping material for making fragmentation.  Any Example

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Fragmentation

Mar 29, 2001

What DBCC or otherwise one would be able to find table fragmentation in SQL 7 and how to take some proactive actions ?

Thanks very much for your time.


-Tim

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Fragmentation

Jun 1, 2004

Would someone please let me know which is the better way to reduce fragmentation on Windows:NT drive?
dbcc indexdefrag
or
dbcc reindex
or
dropping and recreating indexes through SQL?

Thanks
Vinnie

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Fragmentation?

Jul 27, 2007

Sql Server 2000.

For simplicity, I am avoiding minor details.

Here is a scenario.

Create Table T (T_ID int PK, €¦..) and this table is referenced by 20 other places on T_ID.

And these 20 tables have T_ID as PK or part of PK.

We have large volume of deletes in T and in the other 20 tables based on T_ID.

Once the deletes are done, will dropping and re-creating the FK€™s that reference the T_ID
help reduce the fragmentation caused by the deletes?

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Table Fragmentation

May 8, 2001

hi all,

i have inherited a database running on sql7 sp2. a lot of the tables do not have a clustered index. some of these tables are highly fragmented. below is a sample of the dbcc showcontig output

TABLE level scan performed.
- Pages Scanned................................: 104934
- Extents Scanned..............................: 13124
- Extent Switches..............................: 13123
- Avg. Pages per Extent........................: 8.0
- Scan Density [Best Count:Actual Count].......: 99.95% [13117:13124]
- Extent Scan Fragmentation ...................: 5.84%
- Avg. Bytes Free per Page.....................: 7757.4
- Avg. Page Density (full).....................: 4.16%

this table has 5 non-null char columns whose total length is 43 chars and the table occupies about 900 mb for only about 670,000 rows!
select on the table sucks!

since there is no clustered index i have to rebuild the table to remove the fragmentation. is there a way to reorganize the table without recreating it?

thanx

:-)

hemant

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Fragmentation -Urgent

Oct 13, 2000

Hi!

I have a problem with defragmenting the tables. When i ran dbcc showcontig for the tables, it shows 94%, 50%, 33% fragmentations . I have rebuild indexes on all those tables and ran dbcc showcontig again but still it shows the same % of fragmentations. Is there any way to remove fragmentation on all the tables completely. Any help would be appreciated.

Thanks,
Saran

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Disk Fragmentation && SQL

Apr 14, 2004

One of my production servers has been determined to be 92% fragmented.

What's the proper procedure for defraging a database server?

I couldn't find anything very helpful in BOL, nor Knowledge Base.

Sidney Ives
Database Administrator
Sentara Healthcare

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Disk Fragmentation

Aug 9, 2004

What's the best way to find out if disk fragmentation on Windows 2000 Server is affecting SQL Server performance?

If disk fragmentation is shown to be a cause of performance problems, what are the recommendations for a disk fragmentation strategy? eg. use the win 2000 built in disk defrag utility or buy a 3rd party product like DiskKeeper? How much of an overhead is a product like DiskKeeper that defrags in the background?

Clive

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Oct 1, 2004

Hello,

How can I mesure the database fragmentation ? Cause DBCC SHOWCONTIG shows obects fragmentation only. I would like to see the whole database fragmentation.

Thanks for help

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Index Fragmentation

Jun 22, 2008

What functions of tools do you use for managing index fragmentation?

DBCC?

I am working through MS Press SQL 2005 book and it mentions the
sys.dm_db_index_physical_stats function? It then give an example of code which is very involved.

Does anybody use this function?

Thanks

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Index Fragmentation

May 10, 2007

before rebuild index
---------------------
tablenameIndexname
avg_fragmentation_in_percent
Payoff_QuotePK_Payoff_QuoteDetail
83.3333333333333
ALTER INDEX ALL ON Payoff_Quote REBUILD
after issue the above statement result remain same.

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Index Fragmentation

Jun 24, 2007

Hi
When I run sys.dm_db_index_physical_stats on AdventureWorks.Production.Product, I get an average fragmentaion of 46%, 0%, 25% & 50% on the Indexes.

I run ALTER INDEX ALL ON AdventureWorks.Production.Product
REBUILD WITH (FILLFACTOR = 80, SORT_IN_TEMPDB = ON,
STATISTICS_NORECOMPUTE = ON)

and the index fragmentation does not change...

Why is that?? I have tried refreshing the table and the statistics but why does it look like rebuilding the indexes has done nothing?

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Index Fragmentation In The DMV

Sep 25, 2007

I have a nice script that will look at the index fragmentation by using the DMV (sys.dm_db_index_physical_stats) and if its above a specificed threshhold, it will rebuild or reorg the index.

What I have noticed is that even after reorging and/or rebuilding the index, the fragmentation percent in the DMV does not change for some indexes. Other indexes are updated just fine.

Is this a result of updating statistics? Why would the fragmentation change for some indexes and not others? Why does it seem no matter how much rebuilding or reorging is done, the fragmentation percent for some indexes does not change?


- Eric

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Heavy Fragmentation

May 8, 2007

I'm attempting to debug some query timeouts on a production server.

Several tables involved in this query have logical scan fragmentation levels around 10%, and extent scan fragmentation levels 90%+.

Running INDEXDEFRAG or DBREINDEX reduces the logical scan fragmentation down to almost 0%, but the extent scan fragmentation stays upwards of 90%.

Why? What can I do to get this fragmentation down? Is it because this particular index is on a GUID?

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SQL Backup (bak) Fragmentation

Dec 13, 2006

We backup a lot of SQL databases. The db admin uses SQL to dump the databases to a *.bak file on a network share, then we pick them up to tape.

The problem is that for some reason, the backup files are MASSIVELY fragmented, which kills our backup speed to tape (via Netbackup Enterprise). If I defragment the drive (via the built-in tool on Win2K3 or PerfectDisk 8) our speed to tape more than doubles (can go from 16MB/sec to 36MB/sec). However, after the next SQL backup, the drive is completley fragmented once again (around 70%).

Is there any way to improve how these files are written to disk (to keep them relatively in one piece)? For some reason it appears this is a bigger issue with the SQL backup files than any other file type. Thanks.



Jim B

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Fragmentation Does Not Change

Aug 8, 2007

I am running this script to see the fragmentation of indexes.



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

where a.database_id = db_id()

order by a.avg_fragmentation_in_percent desc



When I rebuild an index the fragmentation does not change 10% or lower (default index fill factor is 0, which I think is 90% fill)

SQL Server 2005 EE SP 2

Thanks,
~Joseph~

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Fragmentation Of SQL Data Files

Mar 30, 2004

Hi,

How do you defragement SQL database data files? Running the DBCC DBREINDEX , DBCC INDEXDEFRAG, does that minimize fragmentations of the tables and the indexes files or is it just the index files?
Thanks in advance

a

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SQL Server Memory Fragmentation

Dec 7, 2006

Abe writes "i am using SQL server 2000, when i tried to back up the database in SQL server, the backup began failing coz SQL Server could no longer allocate 964kb of contiguous blocks. (the min needed is 1MB)

What causes the memory or blockes to be fragmented?

How do you solve this issue other than rebooting the server?

How do you prevent this from happening or monitor this issue?

Regards,
Abe"

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Logical Scan Fragmentation

Aug 16, 2007

I have a table with 50% Logical Scan Fragmentation. [ according to Dbcc Showcontig (myTable) ]
Why after running DBCC INDEXDEFRAG (myDB,myTable) does it still sit at 50%.
Why isn't it lower?

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Catch-22 With Fragmentation And Shrinking

Sep 10, 2007

I've inherited a SQL 2005 Server with a major problem. It's been badly admin'd for ages.

It's got a 250gb disk with 3% space free. The disk is 93% fragmented. There is a sql data file of 231gb on that volume that i'm trying to shrink as it has 92gb of free space on it apparently. It won't shrink because the fragmentation is too bad - it just hangs for 2 days then times out. I've tried shrinking the files and database to no avail. I can't defrag as it just says it's finished after 2 minutes and doesn't do anything.

Any suggestions or am I screwed?

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System Tables Fragmentation

Jul 20, 2005

can you defrag system tables. They appear in my dbcc showcontigreport. Some are worse than other but if it where a user table Iwould defrag it. However the reindex commands doesnt work on systemtables.... Any ideas.Thanks Matt.

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Index Fragmentation Issue

Feb 9, 2008



Hi,
It is natural that index gets fragment overtime. But I would like to know how you do the reindexing or defragment when your database table is big and you cannot afford the time to rebuild them. Thanks.

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Check Fragmentation Without DBCC

Nov 21, 2007

Hi All,
I want to check the fragmentation for a table. But I do not have permissions to run DBCC commands on that server. Do we have any other method to identify the health of the table?

Thanks a lot.

Mannu.

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