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Clustering Factor in Index [message #486411]

Wed, 15 December 2010 07:30

vnkumaresh
Messages: 9
Registered: December 2010

Junior Member

HI All,

I am just curious to know what is clustering factor in index and How is it impartant in a sql tuning perspective ?

Thanks

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Re: Clustering Factor in Index [message #486417 is a reply to message #486411]

Wed, 15 December 2010 07:41

Michel Cadot
Messages: 68770
Registered: March 2007
Location: Saint-Maur, France, https...

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http://www.google.com/search?hl=en&source=hp&q=oracle+clustering+factor&aq=4&aqi=g10&aql=&oq=oracle+clust& ;gs_rfai=

Regards
Michel

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Re: Clustering Factor in Index [message #487321 is a reply to message #486417]

Fri, 24 December 2010 19:49

harman_deep
Messages: 8
Registered: August 2005
Location: Amritsar

Junior Member

Clustering factor in simple terms at the best is equal to number of blocks of Index .. and at worst is equal to number of rows in the table.
It is the counter which is incremented by 1 when for next entry in the index block, the new data block is hit and not incremented when the next entry is found in the same database block.

Hope it helps.

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Re: Clustering Factor in Index [message #487335 is a reply to message #487321]

Sat, 25 December 2010 01:15

Michel Cadot
Messages: 68770
Registered: March 2007
Location: Saint-Maur, France, https...

Senior Member
Account Moderator

Quote:

Hope it helps

I know what is a clustering factor, so I know what you say is true but I doubt anyone will understand what is clustering factor if he previously did not know what it is.
Hope I am clear. Wink

Here's an example from Tom Kyte to explain clustering factor (I doubt someone can understand what it is without an example or a schema):
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:22442713557755

Regards
Michel

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