Help on sys.dm_db_index_physical

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Help on sys.dm_db_index_physical_stats

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Shadab Shah

Posted Wednesday, February 06, 2013 12:41 AM

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Hi all,

I am trying sys.dm_db_index_physical_stats. I observed something about sys.dm_db_index_physical_stats and i am not able to make it out why it is so. I search on internet for the same but to no help.

First i created a table as

CREATE TABLE EMP2 (EMPID INT,EMPNAME NVARCHAR(100))

Then i created a clustered on it as

CREATE CLUSTERED INDEX TEMP_CL_ID ON EMP2(EMPNAME)

Now when i fried a query on sys.dm_db_index_physical_stats for the index i have created (using object_id for that index), it return me 2 record . I don't know why i did return me 2 records. Could anybody explain me why is this happening.

Post #1416285

Bhuvnesh

Posted Wednesday, February 06, 2013 12:58 AM

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Copy the data for those records

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Post #1416293

GilaMonster

Posted Wednesday, February 06, 2013 1:02 AM

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If you use the detailed option, index physical stats shows you all levels of the indexes, so that'll be leaf and non-leaf (root if there's only 2). You can see that with the index_level column.

Gail Shaw
Microsoft Certified Master: SQL Server 2008, MVP
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability

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Post #1416295

Shadab Shah

Posted Wednesday, February 06, 2013 2:07 AM

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GilaMonster (2/6/2013)

If you use the detailed option, index physical stats shows you all levels of the indexes, so that'll be leaf and non-leaf (root if there's only 2). You can see that with the index_level column.

Hi Gila i am just a newbie and wanted to know wheather i am correct or not : Leaf/non-leaf of a index is nothing but a Page storage?

Post #1416320

GilaMonster

Posted Wednesday, February 06, 2013 2:22 AM

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Huh? Don't understand the question.

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 #1416332

Bhuvnesh

Posted Wednesday, February 06, 2013 3:27 AM

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Shadab Shah (2/6/2013)

Hi Gila i am just a newbie and wanted to know wheather i am correct or not : Leaf/non-leaf of a index is nothing but a Page storage?

Read these articles http://msdn.microsoft.com/en-us/library/ms177443(v=sql.105).aspx
and http://msdn.microsoft.com/en-us/library/aa174537(v=sql.80).aspx

-------Bhuvnesh----------
While 1 = 1 (Learning SQL....)
Click to get fast response of your post

Post #1416369

Grant Fritchey

Posted Wednesday, February 06, 2013 4:24 AM

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Shadab Shah (2/6/2013)

GilaMonster (2/6/2013)

If you use the detailed option, index physical stats shows you all levels of the indexes, so that'll be leaf and non-leaf (root if there's only 2). You can see that with the index_level column.

Hi Gila i am just a newbie and wanted to know wheather i am correct or not : Leaf/non-leaf of a index is nothing but a Page storage?

An index is stored as a balanced tree. This means it has a series of pages going down. They appear as different levels. When you look at the detailed plan, you get each of these levels. The bottom level, where the details of the index (and for a clustered index, all the data in the table) is referred to as the leaf level.

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Post #1416404

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