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Re: Tuning PostgreSQL

From: Vivek Khera <khera(at)kcilink(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Tuning PostgreSQL
Date: 2003-07-29 15:14:54
Message-ID: x7smope55d.fsf@yertle.int.kciLink.com (view raw or flat)
Thread:
Lists: pgsql-performance
>>>>> "GS" == Greg Stark <gsstark(at)mit(dot)edu> writes:

GS> "scott.marlowe" <scott(dot)marlowe(at)ihs(dot)com> writes:

GS> But you have to actually test your setup in practice to see if it
GS> hurts. A big data warehousing system will be faster under RAID5
GS> than under RAID1+0 because of the extra disks in the
GS> stripeset. The more disks in the stripeset the more bandwidth you
GS> get.

Anyone have ideas on 14 spindles?  I just ordered a disk subsystem
with 14 high speed (U320 15kRPM) SCSI disks to hook up with a dell
PERC3/DC controller (only 128MB cache, though).

My plan was to do RAID10, but I think I'll play with RAID5 again and
see which gives me the best performance.  Unfortunatly, it is
difficult to recreate the highly fragmented tables I have now (vacuum
full takes over 14 hours on one of the tables) so I'm not sure how to
best compare them.

-- 
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Vivek Khera, Ph.D.                Khera Communications, Inc.
Internet: khera(at)kciLink(dot)com       Rockville, MD       +1-240-453-8497
AIM: vivekkhera Y!: vivek_khera   http://www.khera.org/~vivek/

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Subject: Re: Mapping a database completly into Memory
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Subject: Re: Why performance improvement on converting subselect to a function ?

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