| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | "Marcus Andree S(dot) Magalhaes" <marcus(dot)magalhaes(at)vlinfo(dot)com(dot)br> |
| Cc: | pgsql-novice(at)postgresql(dot)org |
| Subject: | Re: number of rows |
| Date: | 2003-06-13 14:12:04 |
| Message-ID: | 447.1055513524@sss.pgh.pa.us |
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| Lists: | pgsql-novice |
"Marcus Andree S. Magalhaes" <marcus(dot)magalhaes(at)vlinfo(dot)com(dot)br> writes:
> I mean, is there any internal variable that stores the number of
> rows instead of sequencially scanning the entire database??
If a very approximate answer is good enough, you could consult
pg_class.reltuples, which is good as of the last VACUUM. There
is no on-the-fly maintenance of a row count, for a number of good
reasons that you can read about in the PG list archives.
regards, tom lane
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