On Tue, Jun 4, 2013 at 12:17 PM, Jeff Janes <jeff.janes@xxxxxxxxx> wrote: > On Monday, June 3, 2013, Amit Langote wrote: >> >> Hello, >> >> In what cases can a relation use more buffers (in shared memory) than >> its pg_class.relpages? > > > I think relpages only counts pages in the main fork, while the buffer cache > will also have buffers for the other forks (visibility map, free space map). > Also, relpages can be out of date if the table has grown since the last > vac/analyze. > Is there a way to refer to pages of these other forks like pg_class.relpages is for referring to relation's disk pages as of the last analyze (is that right?) -- Amit Langote -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
