Oracle is not retaining connections and taking too much time

I am using Oracle9i with oracle pool in my JSP for database handling.
I am using OracleConnectionCacheImpl and OracleConnectionCacheImpl.DYNAMIC_SCHEME.
I am also setting max and min limit for connections
ocacheimpl.setMinLimit (5);
ocacheimpl.setMaxLimit (10);
I have used a startup servlet that loads on tomcat startup
creating pool ( that is, OracleConnectionCacheImpl)
This OracleConnectionCacheImpl in then I am putting as
application wide object and getting access to it in all my JSPs
Initially it creates 5 connections. But after some time (2 hrs or
so) all the connections are getting killed.
Now if I request my JSP then I get error. But after around 30mins
again 5 connections are created automatically( I hope thats what
DYNAMIC_SCHEME would do) and then my JSp works.
My question is why all connections are getting killed and why it
takes so much time to reset the connections again!
Is Oracle's DYNAMIC_SCHEME has got some bug? or I have to do
some settings in my oracle server. Please help

Maybe these help.
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If you reply, let us know which Satellite A300 you have. The model designation looks something like Satellite A300-1OM. The part number looks something like PSAG8E-02Q00TEN.
Is that 32-bit Windows 7?
-Jerry

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[Thu Apr 26 11:39:51 2007] [error] [client 10.1.20.9] [ecid: 80547835731,1] MOD_OC4J_0033: Failed to receive an ajp13 message from oc4j.
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[Thu Apr 26 11:53:32 2007] [error] [client 10.1.20.9] [ecid: 89138452752,1] MOD_OC4J_0033: Failed to receive an ajp13 message from oc4j.
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Please HELP ME...

Hi this is what the solution given by your link
A.1.6 Connection Timeouts Through a Stateful Firewall Affect System Performance
Problem
To improve performance the mod_oc4j component in each Oracle HTTP Server process maintains open TCP connections to the AJP port within each OC4J instance it sends requests to.
In situations where a firewall exists between OHS and OC4J, packages sent via AJP are rejected if the connections can be idle for periods in excess of the inactivity timeout of stateful firewalls.
However, the AJP socket is not closed; as long as the socket remains open, the worker thread is tied to it and is never returned to the thread pool. OC4J will continue to create more threads, and will eventually exhaust system resources.
Solution
The OHS TCP connection must be kept "alive" to avoid firewall timeout issues. This can be accomplished using a combination of OC4J configuration parameters and Apache runtime properties.
Set the following parameters in the httpd.conf or mod_oc4j.conf configuration files. Note that the value of Oc4jConnTimeout sets the length of inactivity, in seconds, before the session is considered inactive.
Oc4jUserKeepalive on
Oc4jConnTimeout 12000 (or a similar value)
Also set the following AJP property at OC4J startup to enable OC4J to close AJP sockets in the event that a connection between OHS and OC4J is dropped due to a firewall timeout:
ajp.keepalive=true
For example:
java -Dajp.keepalive=true -jar oc4j.jar
Please tell me where or which file i should put the option
java -Dajp.keepalive=true -jar oc4j.jar ??????/

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Hi experts!
I'm facing a very weird problem...
We've developed a BPC application (app name: USM).
This application is taking too much time to be loaded in some computers (around 8 minutes to load). Yes, in SOME computers.
There is around 100.000 registers in the database and most coming from material master data.
If I try to load this USM application in another computer, the process loads smoothly. The computer's hardware is all the same, the server is hyper estimated and everyone is in the same network.
I talked to infrastructure departament and we made several tests. We run BPC on the server (loaded quickly), on several computers (some loads quickly, others don't), used wireless and cable connection (got all the same result) and checked communication between BW and BPC but it is ok.
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Edited by: Rubens Massayuki Kumori on May 12, 2011 8:43 PM
Edited by: Rubens Massayuki Kumori on May 12, 2011 8:46 PM

Hi Rubens,
I would try making a couple of test:
1. I will install the client in a machine that is located in the same network segment, or try using a vpn that comunicates with the server bypassing all security devices, only to see if the network it's the problem.
2. Making a full optimize of one application to see if maybe the problem it's related to the segmentation of the cubes (i don't think that this is the problem but give it a try).
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hope it helps,

Oracle is not retaining connections and taking too much time

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