Re: web based app using jdbc questions

[rob@xxxxxxxxx]

Perhaps you've encountered the ancient "deadly embrace".  Most databases, 
(even including the primitive ones from the S/34 and S/36), locked a 
record that was read for update until either:
a)  The record was "updated"
b)  Another record was read by the same application.

One way around that is to make sure that your SQL doesn't read for update. 
 Clauses like "for fetch only" may help you.

Keep us posted.

(Just got back from a week at IBM in Minnesota.)

Rob Berendt
-- 
"They that can give up essential liberty to obtain a little temporary 
safety deserve neither liberty nor safety." 
Benjamin Franklin 





Robert Laing <rlaing@xxxxxxxxx>
Sent by: domino400-bounces@xxxxxxxxxxxx
09/10/2003 09:04 PM
Please respond to Lotus Domino on the iSeries / AS400
 
        To:     Lotus Domino on the iSeries / AS400 
<domino400@xxxxxxxxxxxx>
        cc: 
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        Subject:        web based app using jdbc questions







Hi, 6.0.2CF1 on v5r2

I've created a web based Domino app that relies on webqueryopen Java 
agents
to fill fields on forms from DB2 on our iSeries box.  The application
allows some basic order status inquiry into a couple pf's & lf's.  I'm
using the AS/400 Toolbox for Java JDBC driver and everything was working
great, response time was great  until...

Two different users inquired on the same order at the same time and things
slowed to a crawl.  It's almost seemed as if one of the user sessions was
waiting for the other to finish the agent before the other would start.
Inquiring on different orders concurrently doesn't have the same effect.

I have not added any code in the agents for multi-threading -- never done
that before actually, don't even know if I need it.  Should I be looking 
at
making the agents multi-threading, or should I be looking at the
connections, or something else ???

Thanks in advance,
Bob

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