Re: A thought on Index Organized Tables - Mailing list pgsql-hackers

From Gokulakannan Somasundaram
Subject Re: A thought on Index Organized Tables
Date
Msg-id 9362e74e1002241034x7bbfcd4eh45f6beb521a99af4@mail.gmail.com
Whole thread Raw
In response to Re: A thought on Index Organized Tables  (Tom Lane <tgl@sss.pgh.pa.us>)
List pgsql-hackers


On Wed, Feb 24, 2010 at 10:09 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> So you are essentially proposing that rather than moving the heap
> data into the leaf tuples of the index in the index file, you will
> move the leaf index data into the heap tuples?  The pages in such a
> IOT heap file would still need to look a lot like index pages, yes?

> I'm not saying it's a bad idea, but I'm curious what benefits you
> see to taking that approach.

Isn't that just a variant on Heikki's "grouped index tuples" idea?

                       regards, tom lane
 
No Tom, Grouped index tuple doesn't use the B+ Tree data structure to achieve the sorting, so it will not guarantee 100% clustering of data.

Gokul.

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