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Message-ID: <20041110220947.72060.qmail@web53503.mail.yahoo.com>
Date: Wed, 10 Nov 2004 14:09:47 -0800 (PST)
From: jing han <jing_han_66@yahoo.com>
Subject: about libpq-C FETCH ALL performance issue
To: pgsql-interfaces@postgresql.org
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

Hello,

I'm working on a project where libpq-C is envolved. We
have several background processes keep querying
certain data from database and send them out as ip
packets. With libpq-C interface, I have to use 

res = PQexec(conn, "DECLARE myportal CURSOR FOR select
* from pg_database");

and then  res = PQexec(conn, "FETCH ALL in myportal");


to get the data. 

I found when our database has more and more data, res
= PQexec(conn, "FETCH ALL in myportal"); cost more and
more time, much more than 

res = PQexec(conn, "DECLARE myportal CURSOR FOR select
* from pg_database"); 

and make our sending packet rate extremely low. We get
into big problems here. 

I wonder if there is other faster way ( I mean other
than FETCH ALL command) to get data from database with
libpq-C, or If you have a patch to fix this problem.

Hope to hear from you soon.


Best Regards

jing


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