Scott Marlowe <scott.marlowe@gmail.com> wrote:
> Does this behavior only affect the 9.2 branch? Or was it ported
> to 9.1 or 9.0 or 8.4 as well?
After leaving it on master for a while to see if anyone reported
problems in development, I back-patched as far as 9.0 in time for
the 9.2.3 (and related) patches. Prior to that the code was too
different for it to be the same patch, and (perhaps not entirely
coincidentally) I had not seen the problems before 9.0. From 9.0
on I have seen multiple sites (all using queuing from Slony or a
JMS implementation) with recurring problems when the queue
temporarily got large, shrank again, and then wrapped around to the
beginning of the table's file space. In some cases performance was
so impaired that when such an event was triggered they would shut
down their application until a manual VACUUM could be run.
--
Kevin Grittner
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company