Re: Pre-compile sql
- From: "Niall Litchfield" <niall.litchfield@xxxxxxxxx>
- To: lkemnitz@xxxxxxxx
- Date: Wed, 30 Apr 2008 11:37:40 +0100
Typically if you are considering setting CURSOR_SHARING then it's likely
that you are using string substitution - i.e the statement object rather
than prepared statements in your java app - and so aren't using bind
variables. Rewriting the java code is the best route for this one.
regards
Niall
On Tue, Apr 29, 2008 at 9:19 PM, LeRoy Kemnitz <lkemnitz@xxxxxxxx> wrote:
> All -
>
> I have a java app running on Tomcat - Linux and going against my 10.2.0.2DB
> 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?
>
> --
> //www.freelists.org/webpage/oracle-l
>
>
>
--
Niall Litchfield
Oracle DBA
http://www.orawin.info
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