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how to monitor the amount of bytes fetched in a executeQuery() ?

From: Albert Cardona <acardona(at)ini(dot)phys(dot)ethz(dot)ch>
To: pgsql-jdbc(at)postgresql(dot)org
Subject: how to monitor the amount of bytes fetched in a executeQuery() ?
Date: 2006-07-11 18:27:42
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-jdbc
Hi all,

I have a system in which large (13Mb) images are stored in the database as 
compressed bytea column entries. When fetching from the local computer it's 
fast enough the lag is not noticeable. When fetching remotely at 1Mb LAN 
speed, about 15 seconds elapse.

After timing the executeQuery() and the getBinaryStream(), the first takes 
about 15 seconds and the second about 3. So it looks like the executeQuery() 
is actually downloading the image, and the getBinaryStream is merely copying 
it from a local resource. Is that right?

Is there any way in which the number of bytes fetched in a query or for a 
particular column can be monitored, so I can display a more accurate and 
elaborated waiting dialog in my application?

Thanks for any hints.


Albert Cardona
Molecular Cell Developmental Biology
University of California Los Angeles
Tel +1 310 2067376
Web design:


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