On 2013-09-11 11:35:45 -0700, Josh Berkus wrote:
> All,
>
> We've confirmed that this issue is caused by having long-running idle
> transactions on the server. When we disabled their queueing system
> (which prodiced hour-long idle txns), the progressive slowness went away.
>
> Why that should affect 9.X far more strongly than 8.4, I'm not sure
> about. Does that mean that 8.4 was unsafe, or that this is something
> which *could* be fixed in later versions?
The explanation is in
http://archives.postgresql.org/message-id/20130910132133.GJ1024477%40alap2.anarazel.de
The referenced commit introduced a planner feature. Funnily you seem to
have been the trigger for it's introduction ;)
> I'm also confused as to why this would affect BIND time rather than
> EXECUTE time.
Because we're doing the histogram checks during planning and not during
execution.
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
