| From: | Shridhar Daithankar <shridhar_daithankar(at)myrealbox(dot)com> |
|---|---|
| To: | pgsql-performance(at)postgresql(dot)org |
| Subject: | Re: Help with count(*) |
| Date: | 2003-11-14 07:30:34 |
| Message-ID: | 200311141300.34397.shridhar_daithankar@myrealbox.com |
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| Lists: | pgsql-hackers pgsql-performance |
On Friday 14 November 2003 12:51, Rajesh Kumar Mallah wrote:
> Hi ,
>
> my database seems to be taking too long for a select count(*)
> i think there are lot of dead rows. I do a vacuum full it improves
> bu again the performance drops in a short while ,
> can anyone please tell me if anything worng with my fsm settings
> current fsm=55099264 (not sure how i calculated it)
If you don't need exact count, you can use statistics. Just analyze frequently
and you will get the statistics.
and I didn't exact;y understand this in the text.
INFO: "profiles": found 0 removable, 369195 nonremovable row versions in
43423 pages
DETAIL: 246130 dead row versions cannot be removed yet.
Is there a transaction holoding up large amount of stuff?
Shridhar
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