| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | "Gregory S(dot) Williamson" <gsw(at)globexplorer(dot)com> |
| Cc: | Jeffrey Melloy <jmelloy(at)visualdistortion(dot)org>, Neil Conway <neilc(at)samurai(dot)com>, "Aly S(dot)P Dharshi" <aly(dot)dharshi(at)telus(dot)net>, pgsql-general(at)postgresql(dot)org |
| Subject: | Re: PostgreSQL Gotchas --- count() |
| Date: | 2005-10-07 02:14:40 |
| Message-ID: | 200510070214.j972Eej26805@candle.pha.pa.us |
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| Lists: | pgsql-general |
Gregory S. Williamson wrote:
> On Informix however it is blindingly fast, and can also be instantly
> conjured with the dbaccess tool (Info/Table/Status). They might be
> stashing this count somewhere, but it is not available when the table
> is locked, as during a load. However they do it, performance does not
> seem to suffer, and having this rapidly available is certainly nice.
> Especially when people are used to it.
>
Informix locks rows during modification so they don't have the MVCC
visibility problem we have (some rows are visible to only some
backends).
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 359-1001
+ If your life is a hard drive, | 13 Roberts Road
+ Christ can be your backup. | Newtown Square, Pennsylvania 19073
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