Best Practice for Resolving OAS 10g R3 Classloading Issues

What's the best practices for eliminating classloading issues for shared libraries that are loaded by default (apache.commons.logging, oracle.toplink, etc) in OAS 10g R3?
So far it looks like my options are to exclude the conflicting JARs in my deployed applications or manually remove the entries from the application.xml and system-application.xml files in the OC4J instance config directory.
I know that I can override the shared libraries loaded from the system-application.xml by using the <web-app-class-loader search-local-classes-first="true"/> element in my orion-web.xml but is that the best practice? Also note that this solution does not override the apache.commons.logging shared library loaded from the container's application.xml.
So what is the best practice?

Similar Messages

Best practices for gathering statistics in 10g

I would like to get some opinions on what is considered best practice for gathering statistics in 10g. I know that 10g has auto statistics gathering, but that doesn't seem to be very effective as I see some table stats are way out of date.
I have recommended that we have at least a weekly job that generates stats for our schema using DBMS_STATS (DBMS_STATS.gather_schema_stats). Is this the right approach to generate object stats for a schema and keep it up to date? Are index stats included in that using CASCADE?
Is it also necessary to gather system stats? I welcome any thoughts anyone might have. Thanks.

Hi,
Is this the right approach to generate object stats for a schema and keep it up to date? The choices of executions plans made by the CBO are only as good as the statistics available to it. The old-fashioned analyze table and dbms_utility methods for generating CBO statistics are obsolete and somewhat dangerous to SQL performance. As we may know, the CBO uses object statistics to choose the best execution plan for all SQL statements.
I spoke with Andrew Holsworth of Oracle Corp SQL Tuning group, and he says that Oracle recommends taking a single, deep sample and keep it, only re-analyzing when there is a chance that would make a difference in execution plans (not the default 20% re-analyze threshold).
I have my detailed notes here:
http://www.dba-oracle.com/art_otn_cbo.htm
As to system stats, oh yes!
By measuring the relative costs of sequential vs. scattered I/O, the CBO can make better decisons. Here are the data items collected by dbms_stats.gather_system_stats:
No Workload (NW) stats:
CPUSPEEDNW - CPU speed
IOSEEKTIM - The I/O seek time in milliseconds
IOTFRSPEED - I/O transfer speed in milliseconds
I have my notes here:
http://www.dba-oracle.com/t_dbms_stats_gather_system_stats.htm
Hope this helps. . . .
Don Burleson
Oracle Press author
Author of “Oracle Tuning: The Definitive Reference”
http://www.dba-oracle.com/bp/s_oracle_tuning_book.htm

What are best practice for packaging and deploying j2EE apps to iAS?

We've been running a set of J2EE applications on a pair of iAS SP1b for about a year and it has been quite stable.
Recently however we have had a number of LDAP issues, particularly when registering and unregistering applications (registering ear files sometimes fails 1st time but may work 2nd time). Also We've noticed very occasionally that old versions of classes sometimes find their way onto our machines.
What is considered to be best practice in terms of packaging and deployment, specifically:
1) Packaging - using the deployTool that comes with iAS6 SP1b to package is a big manual task, especially when you have 200+ jsp files. Are people out there using this or are they scripting it with a build tool such as Ant?
2) Deploying an existing application to multiple iAS's. Are you guys unregistering old application then reregistering new application? Are you shutting down iAS whilst doing the deployment?
3) Deploying ear files can take 5 to 10 mins, is this normal?
4) In a clustered scenario where HTTPSession is shared what are the consequences of doing deployments to data stored in session?
thanks in asvance for your replies
Owen

You may want to consider upgrading your application server environment to a newer service pack. There are numerous enhancements involving the deployment tool and run time layout of your application that make clear where you're application is loading its files from.
If you've at a long running application server environment, with lots of deployments under your belt, you might start to notice slow downs in deployment and kjs start time. Generally this is due to garbage collecting in your iAS registry.
You can do several things to resolve this. The most complete solution is to reinstall the application server. This will guarantee a clean ldap registry. Of course you've got to restablish your configurations and redeploy your applications. When done, backup your application server install space with the application server and directory server off. You can use this backup to return to a known configuation at some future time.
For the second method: <B>BE CAREFUL - BACKUP FIRST</B>
There is a more exhaustive solution that involves examining your deployed components to determine the active GUIDS. You then search the NameTrans section of the registry searching for Applogic Servlet *, and Bean * entries that represent your previously deployed components but are represented in the set of deployed GUIDs. Record these older GUIDs, remove them from ClassImp and ClassDef. Finally remove the older entries from NameTrans.
Best practices for deployment depend on your particular environmental needs. Many people utilize ANT as a build tool. In later versions of the application server, complete ANT scripts are included that address compiling, assembly and deployment. Ant 1.4 includes iAS specific targets and general J2EE targets. There are iAS specific targets that can be utilized with the 1.3 version. Specialized build targets are not required however to deploy to iAS.
Newer versions of the deployment tool allow you to specify that JSPs are not to be registered automatically. This can be significant if deployment times lag. Registered JSP's however benefit more fully from the services that iAS offers.
2) In general it is better to undeploy then redeploy. However, if you know that you're not changing GUIDs, recreating an existing application with new GUIDs, or removing registered components, you may avoid the undeploy phase.
If you shut down the KJS processes during deployment you can eliminate some addition workload on the LDAP server which really gets pounded during deployment. This is because the KJS processes detect changes and do registry loads to repopulate their caches. This can happen many times during a deployment and does not provide any benefit.
3) Deploying can be a lengthy process. There have been improvements in that performance from service pack to service pack but unfortunately you wont see dramatic drops in deployment times.
One thing you can do to reduce deployment times is to understand the type of deployment. If you have not manipulated your deployment descriptors in any way, then there is no need to deploy. Simply drop your newer bits in to the run time space of the application server. In later service packs this means exploding the package (ear,war, or jar) in to the appropriate subdirectory of the APPS directory.
4) If you've changed the classes of objects that have been placed in HTTPSession, you may find that you can no longer utilize those objects. For that reason, it is suggested that objects placed in session be kept as simple as possible in order to minimize this effect. In general however, is not a good idea to change a web application during the life span of a session.

Best Practice For Referencing JPEG Path Using Servlets To Prepare HTML IMG

I am migrating a legacy app from Tomcat 5 to Weblogic 11g (10.3). In the legacy app, servlets write HTML that uses relative paths for <IMG src="../images/img.jpeg"> and <script src="../javascript/js.js">. The app is deployed as an exploded archive. Unfortunately, none of the images or script are being loaded. I've tried using http://serverIP:portNum/contextName/images/img.jpeg"> but it doesn't work. I've also checked to get the name of the context in the servlet and it's the root context. Could it have something to do with me having to append .war onto the application when I deploy it? Would it help if I deployed it as a war inside an ear? Basically, I want some best practices for doing this on Weblogic 11g. There are a lot of images and javascript and I'm really hoping they don't have to be inserted using ClassLoader.getResourceAsStream()... thank you.

Best Practice:
1. Move Static files like images, css, java scripts to a web server infrastructure if available.
2. If this is not your case, then please send your directory information how you have packaged your EAR. I can advice :)

Best practices for development / production environments

Our current scenario:
We have one production database server containing the APEX development install, plus all production data.
We have one development server that is cloned nightly (via RMAN duplicate) from production. It therefore also contains a full APEX development environment, and all our production data, albeit 1 day old.
Our desired scenario:
We want to convert the production database to a runtime only environment.
We want to be able to develop in the test environment, but since this is an RMAN duplicated database, every night the runtime APEX will overlay it, and the production versions of the apps will overlay. However, we still want to have up to date data against which to develop.
Questions: What is best practice for this sort of thing? We've considered a couple options:
1.) Find a way to clone the database (RMAN or something else), that will leave the existing APEX environment intact? If such is doable, we can modify our nightly refresh procedure to refresh the data, but not APEX.
2.) Move apex (in both prod and dev environments) to a separate database containing only APEX, and use DBLINKS to point to the data in both cases. The nightly refresh would only refresh the data and the APEX database would be unaffected. This would require rewriting all apps to use DBLINKS though, as well as requiring a change to the code when moving to production (i.e. modify the DBLINK to the production value)
3.) Require the developers to export their apps when done for the day, and reimport the following morning. This would leave the RMAN duplication process unchanged, and would add a manual step which the developers loath.
We basically have two mutually exclusive requirements - refresh the database nightly for the sake of fresh data, but don't refresh the database ever for the sake of the APEX environment.
Again, any suggestions on best practices would be helpful.
Thanks,
Bill Johnson

Bill,
To clarify, you do have the ability to export/import, happily, at the application level. The issue is that if you have an application that consist of more than a couple of pages, you will find yourself in a situation where changes to page 3 are tested and ready but, changes to pages 2, 5 and 6 are still in various stages of development. You will need to get the change for page 5 in to resolve a critical production issue. How do you do this without sending pages 2, 5 and 6 in their current state if you have to move the application all at once??? The issue is that you absolutely are going to need to version control at the page level, not at the application level.
Moreover, the only supported way of exporting items is via the GUI. While practically everyone doing serious APEX development has gone on to either PL/SQL or Utility hacks, Oracle still will not release a supported method for doing this. I have no idea why this would be...maybe one of the developers would care to comment on the matter. Obviously, if you want to automate, you will have to accept this caveat.
As to which version of the backend source control tool you use, the short answer is that it really doesn't matter. As far as the VC system is concerned, you APEX exports are simply files. Some versioning systems allow promotion of code through various SDLC stages. I am not sure about GIT in particular but, if it doesn't support this directly, you could always mimic the behavior with multiple repositories. Taht is, create a development repository into which you automatically update via exports every night. Whenever particular changes are promoted to production, you can at that time export form the development repository and into the production. You could, of course, create as many of these "stops" as necessary to mirror your shop's SDLC stages, e.g. dev, qa, intergation, staging, production etc.
-Joe
Edited by: Joe Upshaw on Feb 5, 2013 10:31 AM

Best Practices for zVM/SLES10/zDB2 environment for dialog instances.

Hi, I am a zSeries system programmer who has just completed an IBM led Proof of Concept which demonstrated the viability of running SAP instances on SUSE SLES10 Linux booted in zVM guests and accessing zDB2 data via hipersockets. Before we build a Linux infrastructure using the 62 IFLs we just procured, we are wondering if any best practices for this environment have been developed as an OSS note or something else by SAP.    Below you will find an email which was sent and responded to by IBM and Novell on these topics...
"As you may know, Home Depot has embarked on an IBM led proof of concept using SUSE SLES10 running in zVM guests on IBM zSeries hardware to host SAP server instances. The Home Depot IT organization is currently in the midst of a large scale push to modernize our merchandising and people systems on SAP platforms. The zVM/SUSE/SAP POC is part of that effort, as is a parallel POC of an Intel Blade/Red Hat/SAP platform. For our production financial systems we now use a pSeries/AIX/SAP platform.
      So far in the zVM/SUSE/SAP POC, we have been able to create four zVM LPARS on IBM z9 hardware, create twelve zVM guests on those LPARS, boot SLES10 in those guests, install and run SAP instances in those guests using hipersockets for access to our DB2 SAP databases running on zOS, and direct user workloads to the SAP instances with good results. We have also successfully developed cloning scripts that have made it possible to create new SLES10 instances, configured and ready for SAP installs, in about 10 seconds using FLASHCOPY and IBM DASD.
      I am writing in the hope that you can direct us to technical resources at IBM/Novell/SAP who may be able to field a few questions that have arisen. In our discussions about optimization of the zVM/SUSE/SAP platform, we wondered if any wisdom about the appropriateness of and support for using zVM capabilities to virtualize SAP has ever been developed or any best practices drafted. Attached you will find an IBM Redbook and a PowerPoint presentation which describes the use of the zVM discontiguous shared segments and the zVM named saved system features for the sharing of reentrant code and other elements of Linux and its applications, thereby conserving storage and disk resources allocated to guest machines.   The specific question of the hour is, can any SAP code be handled similarly? Have specific SAP elements eligible for this treatment been identified?
      I've searched the SUSE Knowledgebase for articles on this topic to no avail. Any similar techniques that might help us reduce the total cost of ownership of a zVM/SUSE/SAP platform as we compare it to Intel Blade/Red Hat/SAP and pSeries/AIX/SAP platforms are of great interest as we approach the end of our POC. Can you help?
      Greg McKelvey is a Client I/T Architect at IBM. He found the attached IBM documents and could give a fuller account of our POC. Pat Downs, IBM zSeries IT Architect, has also worked to guide our POC. Akshay Rao, IBM Systems IT Specialist - Linux | Virtualization | SOA, is acting as project manager for the POC. Jim Hawkins is the Home Depot Architect directing the POC. I've CC:ed their email addresses. I am sure they would be pleased to hear from you if there are the likely questions about what the heck I am asking about here. And while writing, I thought of yet another question that I hoping somebody at SAP might weigh in on; are there any performance or operational benefits to using Linux LVM to apportion disk to filesystems vs. using zVM to create appropriately sized minidisks for filesystems without LVM getting involved?"
As you can see, implementation questions need to be resolved. We have heard from Novell that the SLES10 Kernel and other SUSE artifacts can reside in memory and be shared by multiple operating system images. Does SAP support this configuration? Also, has SAP identified SAP components which are eligible for similar treatment? We would like to make sure that any decisions we make about the SAP platforms we are building will be supportable. Any help you can provide will be greatly appreciated. I will supply the documents referenced above if they are not known to any answerer. Thanks, Al Brasher 770-433-8211 x11895 [email protected]

Hello AL ,
first, let me welcome you on board, I am sure you won't be disapointed with your choice to run SAP on ZOS.
as for your questions,
it wan't easy to find them in this long post , so i suggest you take the time to write a short summary that contains a very short list of questions.
as for answers.
here are a few usefull sources of information :
1. the sap on db2 for Z/os sdn page :
SAP on DB2 for z/OS
in it you can find 2 relevant docs :
a. best practices for ...
b. database administration for db2 udb for z/os .
this second publication is excellent , apart from db2 specific info , it contains information on all the components of the sap on db2 for z/os like zlinux,z/vm and so on ...
2. I can see that you are already familiar with the ibm redbooks , but it seems that you haven't taken the time to get the most out of that resource.
from you post it is clear that you have found one usefull publication , but I know there are several.
3. a few months ago I wrote a short post on a similar subject ,
I'm sure its not exactly what you are looking for at this moment , but its a good start , and with some patience you may be able to get some answers.
here's a link
http://blogs.ittoolbox.com/sap/db2/archives/index-of-free-documentation-on-sap-db2-administration-14245
good luck.
omer brandis.

Best Practices for BI, ADF and Oracle Forms installations on Weblogic

Hi, I'm researching options on upgrading to Oracle 11g Middleware. My company currently has Oracle Forms 10g running on Oracle Application Server.
We are interested in using Oracle Forms 11g, ADF and Jdeveloper, and Business Intelligence with Oracle's Weblogic 10.3.5.
Is there any whitepapers or documentation on best practices for installing alll of these components together?
For instance, can ADF ( with JSF 2.x ) be installed in the same domain as Oracle Forms 11g but use different managed servers?
Will Business Intelligence need to be in a seperate Oracle Home with it's own weblogic installation? I spend a lot of time trying to get the JSF upgraded to 2.x in the Business Intelligence installation and could not get it to work.
I know it's a pretty broad question but thank you for any direction on this.

Thanx for the reply! I read through the documents and they are very good at explaining how to install the different components individually. I still can't find much on installing them together. I hope it's not just going to be a trial and error thing.
So far I've installed done the following successfully:
Installed 10.3.5 weblogic
Forms and Reports 11g on top of 10.3.5
I've created an additional managed server for our ADF applications.
My next step is upgrading the JSF to 2.x. I would have to stage patches 12917525 and 12979653. I'm afraid it will break the forms and reports though. Any ideas?

What are the best practices for the RCU's schemas

Hi,
I was wondering if there is some best practices about the RCU's schemas created with BIEE.
I already have discoverer (and application server), so I have a metadata repository for the Application Server. I will upgrade Discoverer 10g to 11, so I will create new schema with RCU in my metada repository (MR) of the Application Server. I'm wondering if I can put the BIEE's RCU schemas in the same database.
Basically,
1. is there a standard for the PREFIX ?
2. If I have multiple components of Fusion in the same Database, I will have multiples PREFIX_MDS schema ? Can they have the same PREFIX ? Or They all need to have a different prefix ?
For exemple: DISCO_MDS and BIEE_MDS or I can have DEV_MDS and this schema is valid for both Discoverer and BIEE.
Thank you !

What are the best practices for exception handling in n-tier applications?
The application is a fat client based on MVVM pattern with
.NET framework.
That would be to catch all exceptions at a single point in the n-tier solution, log it and create user friendly messages displayed to the user.

Best Practices for user ORACLE

Hello,
I have few linux servers with user ORACLE.
All the DBAs in the team connecting and working on the servers as ORACLE user and they dont have sperate account.
I create for each DBA its own account and would like them to use it.
The problem is that i dont want to lock the ORACLE account since i need it for installation/upgrade and etc , but yet i dont what
the DBA Team to connect and work with the ORACLE user.
What are the Best Practice for souch case ?
Thanks

To install databases you don't need acces to Oracle.
Also installing 'few databases every month' is fundamentally wrong as your server will run out of resources, and Oracle can host multiple schemas in one database.
"One reason for example is that we have many shell scripts that user ORACLE is the owner of them and only user ORACLE have a privilege to execute them."
Database control in 10g and higher makes 'scripts' obsolete. Also as long as you don't provide w access to the dba group there is nothing wrong in providing x access.
You now have a hybrid situation: they are allowed interactively to screw 'your' databases, yet they aren't allowed to run 'your' script.
Your security 'model' is in urgent need of revision!
Sybrand Bakker
Senior Oracle DBA

Best practices for setting up users on a small office network?

Hello,
I am setting up a small office and am wondering what the best practices/steps are to setup/manage the admin, user logins and sharing privileges for the below setup:
Users: 5 users on new iMacs (x3) and upgraded G4s (x2)
Video Editing Suite: Want to connect a new iMac and a Mac Pro, on an open login (multiple users)
All machines are to be able to connect to the network, peripherals and external hard drive. Also, I would like to setup drop boxes as well to easily share files between the computers (I was thinking of using the external harddrive for this).
Thank you,

Hi,
Thanks for your posting.
When you install AD DS in the hub or staging site, disconnect the installed domain controller, and then ship the computer to the remote site, you are disconnecting a viable domain controller from the replication topology.
For more and detail information, please refer to:
Best Practices for Adding Domain Controllers in Remote Sites
http://technet.microsoft.com/en-us/library/cc794962(v=ws.10).aspx
Regards.
Vivian Wang

Best-practice for Catalog Views ? :|

Hello community,
A best practice question:
The situtation: I have several product categories (110), several items in those categories (4000) and 300 end-users. I would like to know which is the best practice for segment the catalog. I mean, some users should only see categories 10,20 & 30. Other users only category 80, etc. The problem is how can I implement this ?
My first idea is:
1. Create 110 Procurement Catalogs (1 for every prod.category). Each catalog should contain only its product category.
2. Assign in my Org Model, in a user-level all the "catalogs" that the user should access.
Do you have any idea in order to improve this ?
Saludos desde Mexico,
Diego

Hi,
Your way of doing will work, but you'll get maintenance issues (to many catalogs, and catalog link to maintain for each user).
The other way is to built your views in CCM, and assign these views to the users, either on the roles (PFCG) or on the user (SU01). The problem is that with CCM 1.0 this is limitated, cause you'll have to assign one by one the items to each view (no dynamic or mass processes), it has been enhanced in CCM 2.0.
My advice:
-Challenge your customer about views, and try to limit the number of views, with for example strategic and non strategic
-With CCM 1.0 stick to the procurement catalogs, or implement BADIs to assign items to the views (I experienced it, it works, but is quite difficult), but with a limitated number of views
Good luck.
Vadim

Best Practice for Securing Web Services in the BPEL Workflow

What is the best practice for securing web services which are part of a larger service (a business process) and are defined through BPEL?
They are all deployed on the same oracle application server.
Defining agent for each?
Gateway for all?
BPEL security extension?
The top level service that is defined as business process is secure itself through OWSM and username and passwords, but what is the best practice for security establishment for each low level services?
Regards
Farbod

It doesnt matter whether the service is invoked as part of your larger process or not, if it is performing any business critical operation then it should be secured.
The idea of SOA / designing services is to have the services available so that it can be orchestrated as part of any other business process.
Today you may have secured your parent services and tomorrow you could come up with a new service which may use one of the existing lower level services.
If all the services are in one Application server you can make the configuration/development environment lot easier by securing them using the Gateway.
Typical probelm with any gateway architecture is that the service is available without any security enforcement when accessed directly.
You can enforce rules at your network layer to allow access to the App server only from Gateway.
When you have the liberty to use OWSM or any other WS-Security products, i would stay away from any extensions. Two things to consider
The next BPEL developer in your project may not be aware of Security extensions
Centralizing Security enforcement will make your development and security operations as loosely coupled and addresses scalability.
Thanks
Ram

Best practice for multi-language content in common areas

I've got a site with some text in header/footer/nav that needs to be translated between an English and Spanish site, which use the same design. My intention was to set up all the text as content to facilitate. However, if I use a standard dialog with the component's path set to a child of the current page node, I would need to re-enter the text on every page. If I use a design dialog, or a standard dialog with the component's path set absolutely, the Engilsh and Spanish sites will share the same text. If I use a standard dialog with the component's path set relatively (eg path="../../jcr:content/myPath"), the pages using the component would all need to be at the same level of the hierarchy.
It appears that the Geometrixx demo doesn't address this situation, and leaves copy in English. Is there a best practice for this scenario?

I'm finding that something to the effect of <cq:include path="<%= strCommonContentPath + "codeEntry" %>" resourceType ...
works fine for most components, but not for parsys, or a component containing a parsys. When I attempt that, I get a JS error that says "design.path is null or not an object". Is there a way around this?

Best Practice for utility in Sol Man 4.0

We have software component ST-ICO of release 150_700 with Patch level 5
We want a Template Selection for Utility industry. I checked in
the service market place and found that 'Baseline Package United
Kingdom V1.50, Template: BP_BLKU150' is available in the above software
component.
But we are not getting any templates other than 'BP_UTUS147 - Best Practices for Water Utility' in the 'SOLAR_PROJECT_ADMIN'
transaction.
Kindly suggest any patch needs to be applied or some configuration need to be done.
Regards
Mani

Hi Mani,
Colud u plz give me the link of "where u find the template BP_BLKU150"?
It will be helpful for me.
Thanks
Senthil

Best Practices for SRM Installation !!

Hi
can someone share the best Practices for SRM Installation ?
What is the typical timeframe to install SRM on development server and as well as on the Production server ?
Appericiate the responses
Thanks,
Arvind

Hi
I don't know whether this will help you.
See these links as well.
<b>http://help.sap.com/bp_epv170/EP_US/HTML/Portals_intro.htm
http://help.sap.com/bp_scmv150/index.htm
http://help.sap.com/bp_biv170/index.htm
http://help.sap.com/bp_crmv250/CRM_DE/index.htm</b>
Hope this will help.
Please reward suitable points.
Regards
- Atul

Best Practice for Resolving OAS 10g R3 Classloading Issues

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