Re: Pre-compile sql

From: Jeremy Schneider <>
Date: Wed, 30 Apr 2008 12:33:56 -0400
Message-ID: <>

25 seconds to hard parse and 4 seconds to execute? just curious, how did you get these figures?


On 4/29/08, LeRoy Kemnitz <> wrote:
> All -
> I have a java app running on Tomcat - Linux and going against my on Unix. This DB is dedicated to this app so I can configure the init
> parms and settings to maximize the performance for this app. We have one
> view that is re-used a lot and is slower than required. I want to get 5 sec
> or less on all data retrievals from this view.
> Currently, we are executing a select from the view when Tomcat starts to
> get the data/plan into oracle memory. The hard parse takes about 25secs.
> The data retrieval takes about 4 seconds. So the first time in, it is
> about 30 secs to get a response back from the db.
> So I am researching how to help this situation. We have been
> experimenting with the cursor_sharing parm. We have found that setting it
> to 'similar' has the best result for us. I am looking into the
> dbms_describe to see if it will do this for me. I will then start to play
> with the keep in the shared pool. I would set up a trigger to fire this on
> startup/logon.
> Has anyone done this before and if so, got any ideas of where to go next?
> --

Jeremy Schneider
Chicago, IL

Received on Wed Apr 30 2008 - 11:33:56 CDT

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