Gregory Stark wrote:
>
> "Alvaro Herrera" <alvherre@postgresql.org> writes:
>
> > Log Message:
> > -----------
> > Avoid losing track of data for shared tables in pgstats. Report by Michael
> > Fuhr, patch from Tom Lane after a messier suggestion by me.
>
> When does this bug date to?
It was in 8.1. I didn't verify whether it affects on 8.0; I think we
separated the shared tables in pgstats in 8.1, with the advent of
autovacuum, so I assume it doesn't. The patch doesn't apply cleanly to
8.0 anyway, and I decided not to spent much time on it seeing that
nobody has noticed it in years.
> is it possible it's related to the performance drop immediately
> following a vacuum analyze we've been seeing?
I don't think so, unless you were counting on pgstats data of shared
tables for something. The optimizer, for one, doesn't, so I doubt it
would affect query planning. And it would only affect you if your
queries were using shared tables, which I very much doubt ...
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.