Hi,

I have noticed that my full vacuum and re-index script is taking a day and a
half instead of 1/2 day.
Recently, the size of my database cluster has doubled to 130 GB. Would
anyone recommend increasing one or more of these to help get my full vacuums
to run a little faster?

Thanks,
~DjK



work memory 49152 KB
shared buffers 65536 (8 KB)
maxfsmpages 480001 (6 bytes each)
maxfsmrelations 30000 (70 bytes each)

effective cache 983040 (8 KB each)



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Mr. Dan wrote:
> Hi,
>
> I have noticed that my full vacuum and re-index script is taking a day and
> a half instead of 1/2 day.
> Recently, the size of my database cluster has doubled to 130 GB. Would
> anyone recommend increasing one or more of these to help get my full
> vacuums to run a little faster?

I guess the question is why are you running vacuum full at all. Plain
vacuum should suffice, provided the FSM settings are enough for your
database:

> maxfsmpages 480001 (6 bytes each)
> maxfsmrelations 30000 (70 bytes each)

max_fsm_pages at 480000 are enough to cover 3 GB, if my math is correct.
It may be enough or it may not, depending on the dynamics of your data.

Also with non-full vacuum you may be able to get away with vacuuming
some tables more often.

--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.

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On Tue, May 30, 2006 at 09:44:22AM -0400, Mr. Dan wrote:
> Hi,
>
> I have noticed that my full vacuum and re-index script is taking a day and
> a half instead of 1/2 day.
> Recently, the size of my database cluster has doubled to 130 GB. Would
> anyone recommend increasing one or more of these to help get my full
> vacuums to run a little faster?

What Alvaro said. I'll also point out, however, that in my
experience, VACUUM FULL time does not increase linearly with database
size. I suspect this is because of the cost of reorganising so much
more data, but I haven't done any real analysis of it.

The main thing is, "Don't do vacuum full."

A
--
Andrew Sullivan | ajs@crankycanuck.ca
The whole tendency of modern prose is away from concreteness.
--George Orwell

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