| From: | Andrew Sullivan <andrew(at)libertyrms(dot)info> |
|---|---|
| To: | pgsql-general(at)postgreSQL(dot)org |
| Subject: | Re: timestamped archive data index searches |
| Date: | 2002-07-22 12:44:35 |
| Message-ID: | 20020722084435.A4211@mail.libertyrms.com |
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| Thread: | |
| Lists: | pgsql-general |
On Sat, Jul 20, 2002 at 07:29:08PM +0000, Stephen Birch wrote:
>
> BTW Another thing I notice with a large database is that count(*) takes
> ages, it
> looks like it has to scan every record. This may be a newbie question or a
> faq, but isn't there a record count kept that would make count(*) return
> quickly?
No. MVCC means that the count() for every connection could be
different. So it has to do a seqscan every time.
A
----
Andrew Sullivan 87 Mowat Avenue
Liberty RMS Toronto, Ontario Canada
<andrew(at)libertyrms(dot)info> M6K 3E3
+1 416 646 3304 x110
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