RE: OC4J Process Architecture

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Mon, 14 Jun 2004 09:30:46 -0500
Message-ID: <0186754BC82DD511B5C600B0D0AAC4D607B007C9@EXCHMN3>

Jurijs

You are correct that it would be great if someone documented everything you could ever want to know about OC4J. Since you don't seem to have that, there are a couple of other approaches you can take. Here are some ideas for you:

You can execute your Java programs on a test system without other users and get some good traces to use with Cary's methods. If that doesn't expose the problems sufficiently, then you at least have gained some experience with the types of traces you will see so that if you decide you must turn on tracing on the production system you won't be totally bewildered.
While it is nice to have the "heavy artillery" for solving problems, bear in mind that most problems are of a simpler nature and can be resolved without the more in-depth methods. Just keep in mind that if the problems don't seem to go away when you apply simple solutions, then you need to use more in-depth methods, rather than persisting in simplistic solutions.
In my experience, few Java programmers are concerned with database issues. Usually their approach is to tell the DBA to "fix that". I think the DBA needs to learn something about Java and how it tends to interact with the database. Particularly if you use an Oracle product like OC4J, this will be viewed as a DBA issue.

The key point is that in the end the performance problems must be understood so the organization can take steps to correct them. How to find the problems may require some study and ingenuity on your part. Don't give up!

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org]On Behalf Of J.Velikanovs_at_alise.lv
Sent: Monday, June 14, 2004 9:04 AM
To: Leslie Tierstein
Cc: dbvision_at_optusnet.com.au; oracle-l_at_freelists.org Subject: RE: OC4J Process Architecture

Tank you for responce,

Unfortunately I already have book you mention (9i JDeveloper Handbook) ;( There a little bit more information, but not so match, as I would like to ;(.
As I wrote, I will be indefinitely happy if it will be the information about OC4J like about RDBMS.
Cary Millsap and others Oracle experts have written excellent books about Oracle wait interface and how to face performance issues. Unfortunately as far as I know, there no possibility to use R-Method or other response-time based performance-tuning method without written own code for debugging purposes.
I am just DBA and you know, I have no big expense with Java programming. At the moment it looks like the good OC4J administrator will be Java top developer who perfectly know Java world. ;(

By my expense Looks like traditional DBA is unpowerful in many OC4J performance tuning situations.

Jurijs
9268222

http://otn.oracle.com/ocm/jvelikanovs.html

"Leslie Tierstein" <Leslie.Tierstein_at_visionchain.com>

14.06.2004 16:14

        
        To:        <oracle-l_at_freelists.org> 
        cc:        <dbvision_at_optusnet.com.au>, <J.Velikanovs_at_alise.lv> 
        Subject:        RE: OC4J Process Architecture

The tinyurl included points to the 9i JDeveloper Handbook, which is for the last version of the product. The JDeveloper 10g Handbook is also listed on Amazon, but isn't published yet. The publication date is early this fall, say, September.

However, the 10g book doesn't contain much information about the internals of OC4J. (I'm one of the technical editors.) But the authors, I know, have encountered similar problems. You might try contacting Paul Dorsey directly (see his company's web site at http://www.dulcian.com) with specific questions. He is usually more than willing to offer advice.

There is another book on Amazon about JDeveloper: Oracle JDeveloper 10G: Empowering J2EE Development

One of the co-authors is Roel Stallman, who is the major Oracle evangelist (that may be his official job title) for JDeveloper. This book may contain more on the internals and architecture, although I haven't looked at it.

Leslie
Leslie Tierstein
Senior Consultant
Vision Chain, Inc.
The first software to power the demand data network phone: 202-261-3549

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of Nuno Souto Sent: Monday, June 14, 2004 6:58 AM
To: oracle-l_at_freelists.org
Subject: Re: OC4J Process Architecture

Original Message -------- Subject: Re: OC4J Process Architecture J.Velikanovs_at_alise.lv apparently said,on my timestamp of 14/06/2004 3:05 AM:

>
> Hope this information will help you.

Yes it does. Thanks a lot for posting it, there is very little information about this library.

There is a book out from Oracle Press, I think, that deals with JDeveloper in detail. Maybe you'd find some additional info there?
http://tinyurl.com/234c6
will take you to it.
HTH.

--
Cheers
Nuno Souto
in sunny Sydney, Australia
dbvision_at_optusnet.com.au




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Received on Mon Jun 14 2004 - 09:31:08 CDT