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Date: Wed, 29 Jun 94 15:37:31 +0200
From: joerg.plewe@mpi-dortmund.mpg.de (J.Plewe)
Message-Id: <9406291337.AA13231@dl.mpi-dortmund.mpg.de>
To: postgres@postgres.Berkeley.EDU
Subject: Access via OID
Resent-To: postgres-redist@postgres.Berkeley.EDU
Resent-Date: Wed, 29 Jun 94 06:38:13 -0700
Resent-XMts: smtp

I have a question where I think to know the answer, but I 
want to make sure:

Is the access with an explicit oid, e.g.

  retrieve (circles.all) where circles.oid = 123456::oid

faster than a selection with any other attribute??

I think no, but e.g. for Oracle I know that having a rowid
lets you access the tuple VERY fast, because file,block,... 
are encoded in the rowid, so Oracle does not have to search.

Is there a similar mechanism for Postgres?


- Joerg


*********************************************************************
Dipl. Phys. Joerg Plewe               joerg.plewe@mpi-dortmund.mpg.de
MPI fuer molekulare Physiologie
Rheinlanddamm 201
44139 Dortmund
Germany                               +49 (0)231 1206 384
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