On Fri, Nov 25, 2011 at 11:39 AM, Alvaro Herrera
<alvherre@commandprompt.com> wrote:
> I'm going to push this now anyway, thanks.
This patch adds a count of the number of buffers dirtied to VACUUM,
but it strikes me that it would be useful to add similar tracking to
pgBufferUsage. Attached is a patch for that. You can see the new
counters through pg_stat_statements or with EXPLAIN (ANALYZE,
BUFFERS). This is useful because the number of buffers that a query
*writes* doesn't necessarily have much to do with anything - it may
end up writing buffers dirtied by other queries while being read-only
itself, or conversely it may not write anything at all even though it
dirties quite a bit.
Thoughts? Comments? Objections?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
