Re: Large dataset performance

From: paul c <>
Date: Wed, 21 Mar 2007 22:53:53 GMT
Message-ID: <5IiMh.47811$DN.34997_at_pd7urf2no>

jma wrote:

>>This is not an SQL problem and there is not enough information in the
>>question to answer it properly, eg., is there some application
>>requirement that the 3.4 M rows be written atomically (all or nothing),
>>are 100 users going to do this 100 times per day each, etc., etc..
>>There was another comment about fewer commits which would make no sense
>>if some transaction notion was involved, in fact it would be dangerous.

> Hello Paul,
> the situation is like this: I have to handle the case where a set of
> remote clients (between 4-16) need to connect to a system and store
> the result of their analysis. The result is typically a 100-200MB
> matrix, but can be more. The number of such matrices would be between
> 100-200. The clients can write it in a local file and I can have a
> server parsing that file into a database. I think this is not as
> elegant as providing the clients with direct connection to the
> database and have them write their data there. So I am trying to
> figure a way that the clients can (as usual ASAP) store their data.
> Going through text based queries is a killer. Even setting up sets of
> SQL commands takes a lot of time. So I am looking for alternatives,
> such as writing blobs. But with blobs I have to read them back to
> memory to find what I am looking for and I am loosing the whole
> functionality of a relational database. So my question is what are the
> alternatives (if any)?
> BR
> jma

I'll take a quick flyer and say that you've given me an opening when you   worry about losing "functionality of a relational database". Ie., now we are getting down to brass tacks, namely the application. What is it that you want to do?

(If I were the CEO of a typical public corporation, I might consider 200MB a useful result for shareholders because I could be certain that most of them couldn't assimilate that much correctly. Most of the time, I'd call such volume an intermediate result, except maybe if it was really really good analysis and the purpose was to print it in stone for posterity, auditors or historians.)

p Received on Wed Mar 21 2007 - 23:53:53 CET

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