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Re: Inserting values into a variable table

From: Jim Nasby <decibel(at)decibel(dot)org>
To: Greg Quinn <greg(at)officium(dot)co(dot)za>
Cc: <pgsql-novice(at)postgresql(dot)org>
Subject: Re: Inserting values into a variable table
Date: 2006-11-28 02:07:16
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-novice
Partitioning isn't a "magic performance bullet"... it only works if  
you can define a clear access pattern, and then use it to segregate  
frequently-accessed data from infrequently-accessed data. In the case  
of email, this *might* make sense if you have some users that have a  
lot of email and rarely access it, but even then the partitioning  
overhead could become an issue...

I'd say design it the simple way first, and see how it performs. If  
performance isn't good enough then it'd be time to start looking at  
other options. In this case, partial indexes might make more sense  
than partitioning the table. Storing the GUID more efficiently  
wouldn't be a bad plan either. But don't add that complexity until  
you know you need to.

On Nov 26, 2006, at 1:53 AM, Greg Quinn wrote:

> Well, I am writing an email client where data will be stored on  
> both the
> client and server. I have a table that stores all the message  
> headers, and a
> table that stores the entire source for every message (including  
> encoding
> for attachments etc.)
> Every time a user clicks on a mail folder, it pulls their message  
> headers
> from the headers table. Every time a user clicks on a message, it  
> needs to
> pull
> The message body etc. from the message source table.
> Now as you can imagine, on the server side, if you have 100 users,  
> and all
> their message source sitting in one big table, it can slow down read
> operations because of all the disk i/o.
> Previously, I was using MySQL and placing all the users data into  
> separate
> tables gave me a huge performance increase.
> I'm not sure if PostGreSQL will handle this better. But my main  
> concern over
> this matter is the problem with Disk I/O on one big table.
> -----Original Message-----
> From: Andrej Ricnik-Bay [mailto:andrej(dot)groups(at)gmail(dot)com]
> Sent: Sunday, November 26, 2006 1:01 AM
> To: pgsql-novice(at)postgresql(dot)org
> Cc: Greg Quinn; Stephan Szabo
> Subject: SPAM-LOW: Re: [NOVICE] Inserting values into a variable table
> On 11/26/06, Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com> wrote:
>> You may consider seeing whether or not there's another way to lay out
>> the data as well that might be easier to work with.
> I'm with Stephan on this one - I'd say that having all mail in one
> table, and using the "random string" that denominates the inbox
> to select the messages on a per user basis.  Makes the code
> to handle things much cleaner, and I can't see a security (or
> other) benefit in the separate tables.
> Cheers
> -- 
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> 11/25/2006
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Jim Nasby                                            jim(at)nasby(dot)net
EnterpriseDB      512.569.9461 (cell)

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