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Re: [despammed] Balance Calculation - Mailing list pgsql-sql

From Andreas Kretschmer
Subject Re: [despammed] Balance Calculation
Date
Msg-id 20050522081753.GA5136@webserv.wug-glas.de
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In response to Balance Calculation  ("Muhyiddin A.M Hayat" <middink@indo.net.id>)
Responses Re: [despammed] Balance Calculation  (Andreas Kretschmer <akretschmer@despammed.com>)
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am  22.05.2005, um 12:15:56 +0800 mailte Muhyiddin A.M Hayat folgendes:

Nice SQL ;-)


> 
> everything is ok, but when record > 1000000 that query eat all my cpu
> process and take a long time, i have wait for 3 mimutes but query

I think, because for every record in your result is a full table scan
required to calculate the balance.


> 
> can you help me how to fix them.
> Can I using function to fix them (how?)

It is possible to create a extra table for the balance and a trigger for
insert/update that calculates the balance for the transactions-table?


I think, this should solve your perfomance-problem.


Regards, Andreas
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