| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Chris Browne <cbbrowne(at)acm(dot)org> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Stats Collector Oddity |
| Date: | 2006-12-21 05:59:22 |
| Message-ID: | 14221.1166680762@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Chris Browne <cbbrowne(at)acm(dot)org> writes:
> We're getting a bit of an anomaly relating to pg_stat_activity...
> ...
> That PID has been dead for several days, but this connection is marked
> as being open, still, after lo many days.
This probably just means that the "backend termination" stats message
got dropped due to heavy load. That's expected behavior in all pre-8.2
releases: the stats system was never intended to provide
guaranteed-exactly-correct status. PG 8.2 has reimplemented the
pg_stat_activity view to make it more trustworthy. (The other stuff is
still probabilistic, but being just event counters, message loss isn't
so obvious.)
regards, tom lane
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