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SQL Server 2005
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SQL Server 2005 Performance Tuning
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Issue in reducing index fragmentation
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Issue in reducing index fragmentation
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Ryan007
Ryan007
Posted Tuesday, February 16, 2010 4:09 AM
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Hi,
I have created a non-unique, non cluster index in one of the table. But when I run the query in my database
select * from sys.dm_db_index_physical_stats(db_id('Inventory'),null,null,null,null)
I can see that there is avg_fragmentation_in_percent of 75 for the newly created index. Ideally it should not have any fragmentation. Even after rebuilding and reorganizing the index also, the fragmentation is not getting reduced. It is showing the same.
Can anyone please explain me the reason?
Ryan
//All our dreams can come true, if we have the courage to pursue them//
Post #865963
steveb.
steveb.
Posted Tuesday, February 16, 2010 5:41 AM
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how many rows are in the table?
Post #866016
GilaMonster
GilaMonster
Posted Tuesday, February 16, 2010 5:46 AM
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How big's the table? How many pages?
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
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Post #866021
muthukkumaran Kaliyamoorthy
muthukkumaran Kaliyamoorthy
Posted Tuesday, February 16, 2010 6:18 AM
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Also,
Object have cluster index ?
Muthukkumaran Kaliyamoorthy
Helping SQL DBAs and Developers >>>
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Post #866043
GilaMonster
GilaMonster
Posted Tuesday, February 16, 2010 6:34 AM
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muthukkumaran (2/16/2010)
Object have cluster index ?
It's not required that a table have a clustered index in order to defragment a nonclustered index.
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #866050
muthukkumaran Kaliyamoorthy
muthukkumaran Kaliyamoorthy
Posted Tuesday, February 16, 2010 6:58 AM
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GilaMonster (2/16/2010)
muthukkumaran (2/16/2010)
Object have cluster index ?
It's not required that a table have a clustered index in order to defragment a nonclustered index.
Yes I agreed Gail.
The OP create a Non clustered index,so i guess the table was Heap.
Muthukkumaran Kaliyamoorthy
Helping SQL DBAs and Developers >>>
SqlserverBlogForum
Post #866072
GilaMonster
GilaMonster
Posted Tuesday, February 16, 2010 7:03 AM
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muthukkumaran (2/16/2010)
The OP create a Non clustered index,so i guess the table was Heap.
How do you conclude that?
Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild
: Discussions on DB performance with occasional diversions into recoverability
We walk in the dark places no others will enter
We stand on the bridge and no one may pass
Post #866076
muthukkumaran Kaliyamoorthy
muthukkumaran Kaliyamoorthy
Posted Tuesday, February 16, 2010 8:43 PM
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Just guess....
Muthukkumaran Kaliyamoorthy
Helping SQL DBAs and Developers >>>
SqlserverBlogForum
Post #866697
Ryan007
Ryan007
Posted Wednesday, February 17, 2010 6:14 AM
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Hi All ,
sorry for the late reply. Actually the table is very small it has only 399 rows and size is 234MB. Previously it was a heap table. Just for testing purpose I created a non-unique, non-clustered index on that table.
Ryan
//All our dreams can come true, if we have the courage to pursue them//
Post #866951
steveb.
steveb.
Posted Wednesday, February 17, 2010 6:19 AM
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You shouldn't worry about fragmentation on a table with that few rows.
MS recomends that you should not be concerned with fragementation of indexes with less than 1000 pages
Post #866953
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