RE: Inactive Sessions/Java

Nuala,

I have been on this damn Java Client connections for quite a while.

If it is development , you can use PROFILES/SESSIONS_PER_USER and prevent init.ora setting from being reached and hog the system.

The unfortunate thing is the connection pool is that the code is not proven in most of the cases. We have a mechanism by which every connection gets its SID (courtesy v$mystat) and keeps track of the connections created initially. The pool is allotted in a round robin fashion based on which of the pool is free. Besides the settings are Initial = x, next = y for the connection pooling. The default setting is Minimum = Initial. Besides there is a timeout after which the 'extra' sessions are timed out and closed. Hence after running for a while you shall find only the min.no of connections against the user. It does not stop here. The connection (since not closed or since it is reused) continues to grab memory and if the Tomcat is not shutdown periodically (based on your SGA setting and no.of.trns etc) you are likely to run into ORA-04030. Add to this , the compatibility of the jdbc driver. We are on 9iRel2 (9.2.0.1). I understand that there are some memory related fixes avbl. but my first area of investigation would be the connection pool + jdbc driver.

Also, i suggest you program your conn.pool mechanism to close after every n trips to the database. Get a new connection. This way you are not likely to run into the problem.

As of now , i am able to recollect only this much. May be someone else in the list has a better idea.

IMHO, SQLNET_TIMEOUT does not work for inactive connections. It is for DCDs (Dead Client Detection).

HTH GovindanK

> Nuala
> I think many of us are struggling to understand the new
> Web/Internet/Java
> world. Many times the Java program is hosted by an application server. I
> don't think that is essential though. There are many different application
> servers, so you might ask around. Popular ones are Oracle9i AS, Weblogic,
> Tomcat. Most application servers perform a connection pooling function. If
> the connection pooling is set incorrectly, that can cause problems in
> Oracle
> like running out of processes.
> If you don't have an application server, in Oracle you can configure
> MTS
> to handle huge numbers of connections. Essentially this is Oracle's way of
> performing connection pooling.
> Another feature is Oracle Connection Manager's connection concentration
> feature, but I'm not sure if that will work, depending on whether your
> application is using the Oracle Thin Client or thick client. And that may
> be
> something you should learn about this application.
> Another aspect of your issue might be setting a time limit in sqlnet
> for
> inactive sessions. I think the parameter is SQLNET_TIMEOUT, but I have not
> used this myself.
>
> -----Original Message-----
> Sent: Friday, August 29, 2003 11:20 AM
> To: Multiple recipients of list ORACLE-L
>
>
> Hi Dennis,
>
> I'm not too sure what you are asking so I will give you a brief overview
> of
> the set up;
>
> The oracle server (version 8.1.7.4) (running on windows2000)
> The java process is running on this server.
> Users connect to the java process via Radio Data Terminals.(RDT's)
> The java process then handles all the calls made by the RDT's.
>
> So the answer to your question I think is that the java process connect
> directly to the server.
>
> Later,
>
> N.
>
> :->-----Original Message-----
> :->From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com]On
> :->Behalf Of
> :->DENNIS WILLIAMS
> :->Sent: 29 August 2003 16:49
> :->To: Multiple recipients of list ORACLE-L
> :->Subject: RE: Inactive Sessions/Java
> :->
> :->
> :->Naula
> :-> Are these Java processes being hosted by an application
> :->server or do they
> :->just connect directly to your Oracle database?
> :->
> :->Dennis Williams
> :->DBA, 80%OCP, 100% DBA
> :->Lifetouch, Inc.
> :->dwilliams_at_lifetouch.com
> :->
> :->
> :->-----Original Message-----
> :->Sent: Friday, August 29, 2003 4:49 AM
> :->To: Multiple recipients of list ORACLE-L
> :->
> :->
> :->
> :->Hi Tanel,
> :->
> :->Thanks for the reply.
> :->
> :->The "Java process" is an application that allows the users
> :->to connect via
> :->Radio Data Terminals to the Database.
> :->The only thing is the number of processes is increasing the
> :->whole time and
> :->when it's reaches the limit sent in the init.ora no more
> :->connections are
> :->allowed which causes some problems!!
> :->
> :->Bar setting the number of processes in the init.ora to some
> :->huge number
> :->and/or stop and restarting the java process is there any other way of
> :->stopping this from happing?
> :->
> :->Thanks,
> :->
> :->N.
> :->
> :->:->-----Original Message-----
> :->:->From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com]On
> :->:->Behalf Of
> :->:->Tanel Poder
> :->:->Sent: 28 August 2003 20:59
> :->:->To: Multiple recipients of list ORACLE-L
> :->:->Subject: Re: Inactive Sessions/Java
> :->:->
> :->:->
> :->:->What is "Java process"? Is it a java class running in some kind of
> :->:->application server?
> :->:->If yes, then your application server is keeping your
> :->:->connections open and
> :->:->using connection pooling to share them between your
> :->:->"processes", somewhat
> :->:->reducing the overhead to create & drop a connection for
> :->:->every interaction
> :->:->with database. This is generally a good thing.
> :->:->
> :->:->Tanel.
> :->:->----- Original Message -----
> :->:->To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> :->:->Sent: Thursday, August 28, 2003 8:29 PM
> :->:->
> :->:->
> :->:->>
> :->:->>
> :->:->> Hi All,
> :->:->>
> :->:->> I have a problem with inactive sessions (despite having set the
> :->:->> sqlnet.expire parameter)
> :->:->>
> :->:->> Some of the users connect to the database via a java
> :->:->process - when I
> :->:->stop
> :->:->> this process from running the number of sessions just
> :->:->shots right down.
> :->:->>
> :->:->> Short of scheduling a start and restart of this process
> :->:->can anybody else
> :->:->> come up with a solution??
> :->:->>
> :->:->> I am reluctant to touch the java process as this is part
> :->:->of the production
> :->:->> box. (plus my knowledge of java is hovering over zero percent)
> :->:->>
> :->:->> Any ideas appreciated,
> :->:->>
> :->:->> thanks,
> :->:->>
> :->:->> N.
> :->:->>
> :->:->
> :->:->
> :->:->--
> :->:->Please see the official ORACLE-L FAQ: http://www.orafaq.net
> :->:->--
> :->:->Author: Tanel Poder
> :->:-> INET: tanel.poder.003_at_mail.ee
> :->:->
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