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Re: 4G row table?

From: "Charles H(dot) Woloszynski" <chw(at)clearmetrix(dot)com>
To: josh(at)agliodbs(dot)com
Cc: gry(at)ll(dot)mit(dot)edu, pgsql-performance(at)postgresql(dot)org
Subject: Re: 4G row table?
Date: 2002-12-19 19:27:25
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance

Why do you say to expect slow performance on this hardware?   Is there 
something specific about the configuration that worries you?  Or, just 
lots of data in the database, so the data will be on disk and not in the 
cache (system or postgresql)?  

What do you classify as *slow*?  Obviously, he is dependent on the I/O 
channel given the size of the tables.  So, good indexing will be 
required to help on the queries.  No comments on the commit rate for 
this data (I am guessing that it is slow, given the description of the 
database), so that may or may not be an issue.  

Depending on the type of queries, perhaps clustering will help, along 
with some good partitioning indexes.  

I just don't see the slow in the hardware.  Of course, if he is 
targeting lots of concurrent queries, better add some additional 
processors, or better yet, use ERSERVER and replicate the data to a farm 
of machines.  [To avoid the I/O bottleneck of lots of concurrent queries 
against these large tables].

I guess there are a lot of assumptions on the data's use to decide if 
the hardware is adequate or not :-)


Josh Berkus wrote:

>>[linux, 700MHz athlon, 512MB RAM, 700GB 10kRPM SCSI HW RAID, postgresql 7.2]
>What kind of RAID?  How many drives?  Will you be updating the data 
>frequently, or mostly just running reports on it?
>Unless you have a *really* good RAID array, expect slow performance on this 
>hardware platform.


Charles H. Woloszynski

ClearMetrix, Inc.
115 Research Drive
Bethlehem, PA 18015

tel: 610-419-2210 x400
fax: 240-371-3256

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