Doc updates for index-only scans.

Robert Haas <rhaas@postgresql.org>

Commit: 5b9c1e6d52dfd022a074462e029bfd7f7bc4321c
Author: Robert Haas <rhaas@postgresql.org>
Date: 2012-03-21T18:52:44Z
Releases: 9.2.0
Doc updates for index-only scans.

Document that routine vacuuming is now also important for the purpose
of index-only scans; and mention in the section that describes the
visibility map that it is used to implement index-only scans.

Marti Raudsepp, with some changes by me.

Files

PathChange+/−
doc/src/sgml/maintenance.sgml modified +32 −0
doc/src/sgml/storage.sgml modified +10 −5