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Cluster That Index - Part 2


Cluster That Index - Part 2

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Chris Hedgate
Chris Hedgate
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Comments posted to this topic are about the content posted at http://www.sqlservercentral.com/columnists/chedgate/clusterthatindexpart2.asp

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Chris Hedgate http://www.hedgate.net/
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ray_higdon
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Just read both of them, I am always amazed that there is always something new to learn about indexing. Excellent article, hesitant to trust that page splitting is so nominal (from first article) but have to do more testing.

Ray Higdon MCSE, MCDBA, CCNA

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Ray Higdon MCSE, MCDBA, CCNA
Chris Hedgate
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quote:

Just read both of them, I am always amazed that there is always something new to learn about indexing. Excellent article, hesitant to trust that page splitting is so nominal (from first article) but have to do more testing.



Thanks Ray, glad that you liked them. If you do any testing on page splits please notify me with your findings.

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Chris Hedgate @ Apptus Technologies (http://www.apptus.se)
http://www.sql.nu

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Chris Hedgate http://www.hedgate.net/
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Chris Hedgate
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About the title, "Cluster that index - part 2", it should have been either simply "Forward pointers" or maybe part 3 och Cluster that index, since there is already a part 2 (http://www.sqlservercentral.com/columnists/chedgate/clusterthatindexparttwo.asp).

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Chris Hedgate @ Apptus Technologies (http://www.apptus.se)
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blaireau
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I got a question:

If a data page is split, there is a pointer added to the original page to point toward the new page (forward pointer like you just explained). If this new page is split again, is there another Forward pointer added to this page? This would mean that we are now at left with 3 pages?

Is there a way to set SQL to automatically removed this forward pointer? In a job maybe?

BTW good short and simple article.

Eric Blais


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Chris Hedgate
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quote:

If a data page is split, there is a pointer added to the original page to point toward the new page (forward pointer like you just explained). If this new page is split again, is there another Forward pointer added to this page?



No, the original pointer would just be changed to point to the new location.

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Chris Hedgate @ Apptus Technologies (http://www.apptus.se)
http://www.sql.nu

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DCPeterson
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Good series of articles Chris. I especially appreciated that you got the "physical ordering" thing right. That is the source of much confusion, and if I were to make one recommendation it would be to emphasize the fact that clustered indexes do not maintain the physical ordering of data pages on disk.

/*****************

If most people are not willing to see the difficulty, this is mainly because, consciously or unconsciously, they assume that it will be they who will settle these questions for the others, and because they are convinced of their own capacity to do this. -Friedrich August von Hayek



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