| From: | Shridhar Daithankar <shridhar_daithankar(at)myrealbox(dot)com> |
|---|---|
| To: | Mark Kirkwood <markir(at)paradise(dot)net(dot)nz>, Christopher Browne <cbbrowne(at)acm(dot)org> |
| Cc: | pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: *sigh* |
| Date: | 2003-12-03 09:16:30 |
| Message-ID: | 200312031446.30141.shridhar_daithankar@myrealbox.com |
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| Thread: | |
| Lists: | pgsql-hackers |
On Wednesday 03 December 2003 13:59, Mark Kirkwood wrote:
> How about:
>
> Implement a function "estimated_count" that can be used instead of
> "count". It could use something like the algorithm in
> src/backend/commands/analyze.c to get a reasonably accurate psuedo count
> quickly.
>
> The advantage of this approach is that "count" still means (exact)count
> (for your xact snapshot anyway). Then the situation becomes:
>
> Want a fast count? - use estimated_count(*)
> Want an exact count - use count(*)
Something like select reltuples from pg_class where relname='foo'?
Shridhar
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