| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Simon Riggs" <simon(at)2ndquadrant(dot)com> |
| Cc: | "Kim" <kim(at)myemma(dot)com>, pgsql-performance(at)postgresql(dot)org, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: [HACKERS] unusual performance for vac following 8.2 upgrade |
| Date: | 2007-01-11 21:11:40 |
| Message-ID: | 5414.1168549900@sss.pgh.pa.us |
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| Lists: | pgsql-hackers pgsql-performance |
"Simon Riggs" <simon(at)2ndquadrant(dot)com> writes:
> It's not clear to me how this fix will alter the INSERT issue Kim
> mentions.
I didn't say that it would; we have no information on the INSERT issue,
so I'm just concentrating on the problem that he did provide info on.
(BTW, I suppose the slow-\d issue is the regex planning problem we
already knew about.)
I'm frankly not real surprised that there are performance issues with
such a huge pg_class; it's not a regime that anyone's spent any time
optimizing. It is interesting that 8.2 seems to have regressed but
I can think of several places that would've been bad before. One is
that there are seqscans of pg_inherits ...
regards, tom lane
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