> What I find interesting about that trace is the large proportion of
> writes. That appears to me to indicate that it's *not* a matter of
> vacuum delays, or at least not just a matter of that. The process seems
> to be getting involved in having to dump dirty buffers to disk. Perhaps
> the background writer is malfunctioning?
You appear to be correct in that it's write-related. Will be testing on
what specificially is producing it.
Note that this is one of two ostensibly duplicate servers, and the issue
has never appeared on the other server.
--
-- Josh Berkus
PostgreSQL Experts Inc.
http://www.pgexperts.com
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