Thread: postgres configuration

Hi All,<br /><br />Sorry if this is the wrong list to ask this question.<br /><br />My Vacuum's are running very very
slowand expecially when vacuuming indexes in large tables of size in 5-10 gigabytes,<br />can some one help me
determinethe parameters for postgres.conf which will help me vacuum fast. I'm running postgres on a server with 32 gigs
ofram and 8 processors.<br /><br /><br />Thanks,<br />Sumeet.  

On 3/14/07, Sumeet <asumeet@gmail.com> wrote:
> Hi All,
Hi,

> Sorry if this is the wrong list to ask this question.
General woould have been better :)

> My Vacuum's are running very very slow and expecially when vacuuming indexes
> in large tables of size in 5-10 gigabytes,
> can some one help me determine the parameters for postgres.conf which will
> help me vacuum fast. I'm running postgres on a server with 32 gigs of ram
> and 8 processors.
And the disk subsystem is .... ?



> Thanks,
> Sumeet.
Cheers,
Andrej

The only info i have is

Apple xRaid drive array with 14 400GB drives for a total of 5 TB storage
I have around 10-15 indexes for each tables. does the number of indexes slow down the vacuum process?
indexes are compund indexes on multiple fields.

-Sumeet





--
Thanks,
Sumeet Ambre
Master of Information Science Candidate,
Indiana University.

On Tue, 2007-03-13 at 15:48, Sumeet wrote:

> On 3/13/07, Andrej Ricnik-Bay <andrej.groups@gmail.com> wrote:
>         On 3/14/07, Sumeet <asumeet@gmail.com> wrote:
>         > Hi All,
>         Hi,
>         
>         > Sorry if this is the wrong list to ask this question.
>         General woould have been better :)
>         
>         > My Vacuum's are running very very slow and expecially when
>         vacuuming indexes
>         > in large tables of size in 5-10 gigabytes,
>         > can some one help me determine the parameters for
>         postgres.conf which will 
>         > help me vacuum fast. I'm running postgres on a server with
>         32 gigs of ram
>         > and 8 processors.
>         And the disk subsystem is .... ?
>         
>         The only info i have is
> 
> Apple xRaid drive array with 14 400GB drives for a total of 5 TB
> storage
> I have around 10-15 indexes for each tables. does the number of
> indexes slow down the vacuum process?
> indexes are compund indexes on multiple fields. 

Yes, indexes have to be vacuumed, and compound fields tend to get larger
at a geomtric rate as you add columns.

Apple XRaids have gotten some pretty "meh" reviews in the past.  Does
this one have battery backed caching? (a good thing) Is it configured as
RAID-5 (a not so good thing)

If so, can you reconfigure it as RAID1+0 or do you need every terabyte
of storage you can get?

Sumeet <asumeet@gmail.com> writes:
> My Vacuum's are running very very slow and expecially when vacuuming indexes
> in large tables of size in 5-10 gigabytes,
> can some one help me determine the parameters for postgres.conf which will
> help me vacuum fast. I'm running postgres on a server with 32 gigs of ram
> and 8 processors.

What postgres version?

8.2 should be considerably faster than prior releases due to Heikki's
fixes to let indexes be scanned in physical order during VACUUM.
        regards, tom lane