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mailsaurabh.tripathi
New User
Joined: 22 May 2008
Posts: 56
Location: hyderabad
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| Can someone provide me info on how does DB2 perform index only access? |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19244
Location: Inside the Matrix
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Hello,
By only accessing the index?
Your question is not clear. . . 
What are trying to learn? |
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Steve Davies
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Joined: 15 Oct 2009
Posts: 32
Location: UK
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| If all the columns you want to retrieve are in the index, then it can meet your select statement criteia by only going to the index, therefore it does not need to go to the tablespace to get any extra columns. This is an index only access. It is more efficient for obvious reasons. |
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