On 9/11/07, Bruce Momjian <[EMAIL PROTECTED]> wrote:
> Right.  My point is that pruning only modifies item pointers.  It does
> not change the actual heap tuples.  In the quote above, how is Heikki's
> "quick pruning" different from the pruning you are describing?
I think the only difference is that the quick pruning does not mark
intermediate tuples ~LP_USED and hence we may avoid WAL logging.

Btw, I am not too enthusiastic about quick pruning because it leaves
behind dead heap-only tuples which are not reachable from any root
heap tuples. Not that we can't handle them, but I am worried about
making such changes right now unless we are sure about the benefits.
We can always tune and tweak in 8.4


Pavan Deolasee
EnterpriseDB     http://www.enterprisedb.com

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