what is the STRUCKED THREADS

WebLogic Server diagnoses a thread as stuck if it is continually working (not idle) for a set period of time. You can tune stuck threads in the Weblogic Server.
You can tune a server’s thread detection behavior by changing the length of time before a thread is diagnosed as stuck, and by changing the frequency with which the server checks for stuck threads.

It can be configured using below mentioned 2 parameters. These can be configured from Admin console -> Servers ->Configuration > Tuning tab.

1)Stuck Thread Max Time
2)Stuck Thread Timer Interval

Although you can change the criteria WebLogic Server uses to determine whether a thread is stuck, you cannot change the default behavior of setting the “warning” and “critical” health states when all threads in a particular execute queue become stuck.

There is a parameter "Stuck Thread Count" which can be configured from Console
(Servers -> Configuration ->Overload -> Stuck Thread count) which helps to transition the Server to FAILED state once the stuck threads reaches the value.

You can also use "OverloadProtectionMBean" for tuning. In Weblogic Server 9.x and later, it is recommended that you use the "ServerFailureTriggerMBean" in the "OverloadProtectionMBean".The ServerFailureTriggerMBean transitions the server to a FAILED state after the specified number of stuck threads are detected.The OverloadProtectionMBean has options to suspend or shutdown a failed server.

WebLogic Server checks for stuck threads periodically. If all application threads are stuck, a server instance marks itself failed, if configured to do so, exits. You can configure Node Manager or a third-party high-availability solution to restart the server instance for automatic failure recovery.

You can configure these actions to occur when not all threads are stuck, but the number of stuck threads have exceeded a configured threshold:
- Shut down the Work Manager if it has stuck threads. A Work Manager that is shut down will refuse new work and reject existing work in the queue by sending a rejection message. In a cluster, clustered clients will fail over to another cluster member.
- Shut down the application if there are stuck threads in the application. The application is shutdown by bringing it into ADMIN mode. All Work Managers belonging to the application are shut down, and behave as described above.
- Mark the server instance as failed and shut it down it down if there are stuck threads in the server. In a cluster, clustered clients that are connected or attempting to connect will fail over to another cluster member.

You can configure the "ServerFailureTriggerMBean" in the "OverloadProtectionMBean".

Below is documentation link for "ServerFailureTriggerMBean" methods.
http://download.oracle.com/docs/cd/E12839_01/apirefs.1111/e13945/weblogic/management/configuration/ServerFailureTriggerMBean.html

You can use getStuckThreadCount() method to check the number of stuck threads and transition the server to Failed State once itreaches the limit.

getStuckThreadCount:

int getStuckThreadCount() - The number of stuck threads after which the server is transitioned into FAILED state. There are options inOverloadProtectionMBean to suspend and shutdown a FAILED server. By default, the server continues to run in FAILED state. If the StuckThreadCount value is set to zero then the server never transitions into FAILED server irrespective of the number of stuck threads.

Returns:
The StuckThreadCount value
Default Value:
0
Maximum Value:
java.lang.Integer.MAX_VALUE
Minimum Value:
0

Below is documentation link for "OverloadProtectionMBean" methods.
http://download.oracle.com/docs/cd/E11035_01/wls100/javadocs_mhome/weblogic/management/configuration/OverloadProtectionMBean.html

In the Admin console, you can set the "FailureAction" under Servers->Configuration->Overload to force shutdown the managed server once the server is in Failed state.

The OverloadProtectionMBean has a method getFailureAction to achieve the same.

getFailureAction:

String getFailureAction() - Enable automatic forceshutdown of the server on failed state. The server self-health monitoring detects fatal failures and mark the server as failed. The server can be restarted using NodeManager or a HA agent.

Valid Values:
OverloadProtectionMBean.NO_ACTION, OverloadProtectionMBean.FORCE_SHUTDOWN, OverloadProtectionMBean.ADMIN_STATE

If you start the managed servers using node manager, you can enable "Auto Kill if Failed" and "Auto Restart" in the Admin console, under Servers-> configuration->Health Monitoring. Node Manager will take care of restarting the managed server if you enable "Auto Restart".

You can also configure the "Stuck Thread Count" and "Failure Action" to "Force Immediate shutdown of the Server" from Admin console under servers-> configuration-> Overload. This will help you to shutdown the server when the stuck thread count is reached. But there is no way to release the threads once they are stuck from the configuration.

Suppose if you set the value of the Stuck Thread Count to 20, The server will be transitioned to failed state once the count reaches 20 and if you enable the Failure Action, the server self-health monitoring detects fatal failures and mark the server as failed.

Depending on how you are starting the servers (custom scripts or Node Manager or startup scripts,...), you can restart the servers.

For more details on this please refer to below link:
http://www.oracle.com/technetwork/articles/entarch/workload-management-088692.html

Flash file is opening in a seperate window but flash video is not running/working.

we have to add

AddOutputFilterByType DEFLATE application/x-shockwave-flash in OHS server

under <IfModule mod_deflate.c>

OHS server configuration

1168831.1

apachectl command line usage

apachectl is a front end to the Apache HyperText Transfer Protocol (HTTP) server. It is designed to help the administrator control the functioning of the Apache httpd daemon.
The apachectl script can operate in two modes. First, it can act as a simple front-end to the httpd command that simply sets any necessary environment variables and then invokes httpd, passing through any command line arguments. Second, apachectl can act as a SysV init script, taking simple one-word arguments like start, restart, and stop, and translating them into appropriate signals to httpd.
If your Apache installation uses non-standard paths, you will need to edit the apachectl script to set the appropriate paths to the httpd binary. You can also specify any necessary httpd command line arguments. See the comments in the script for details.
The apachectl script returns a 0 exit value on success, and >0 if an error occurs. For more details, view the comments in the script.

Synopsis

When acting in pass-through mode, apachectl can take all the arguments available for the httpdbinary.
apachectl [ httpd-argument ]
When acting in SysV init mode, apachectl takes simple, one-word commands, defined below.
apachectl command

Options

Only the SysV init-style options are defined here. Other arguments are defined on the httpd manual page.

start

Start the Apache httpd daemon. Gives an error if it is already running. This is equivalent to apachectl -k start.

stop

Stops the Apache httpd daemon. This is equivalent toapachectl -k stop.

restart

Restarts the Apache httpd daemon. If the daemon is not running, it is started. This command automatically checks the configuration files as in configtest before initiating the restart to make sure the daemon doesn't die. This is equivalent to apachectl -k restart.

fullstatus

Displays a full status report from mod_status. For this to work, you need to have mod_status enabled on your server and a text-based browser such as lynxavailable on your system. The URL used to access the status report can be set by editing the STATUSURL variable in the script.

status

Displays a brief status report. Similar to thefullstatus option, except that the list of requests currently being served is omitted.

graceful

Gracefully restarts the Apache httpd daemon. If the daemon is not running, it is started. This differs from a normal restart in that currently open connections are not aborted. A side effect is that old log files will not be closed immediately. This means that if used in a log rotation script, a substantial delay may be necessary to ensure that the old log files are closed before processing them. This command automatically checks the configuration files as in configtest before initiating the restart to make sure Apache doesn't die. This is equivalent toapachectl -k graceful.

graceful-stop

Gracefully stops the Apache httpd daemon. This differs from a normal stop in that currently open connections are not aborted. A side effect is that old log files will not be closed immediately. This is equivalent to apachectl -k graceful-stop.

configtest

Run a configuration file syntax test. It parses the configuration files and either reports Syntax Okor detailed information about the particular syntax error. This is equivalent to apachectl -t.

The following option was available in earlier versions but has been removed.

startssl

To start httpd with SSL support, you should edit your configuration file to include the relevant directives and then use the normal apachectl start.

Apache Server command line usage

Apache Command Line

You may need to run Apache from the command line occasionally. You can obtain a complete listing of the Apache command line options by using the "-help" argument. For example, you would need to open a command window and cd to the Apache directory. On UNIX, cd into the bin directory under Apache. Now run the command:

apache -help

Or on UNIX:

apache-lyris -help

With respect to the command line tools described herein, it is implied that you are running in a command window (MS-DOS prompt on Windows or xterm/cmdtool or equivalent on UNIX/Linux) and are currently in the Apache directory.
UNIX Specific Tools If you are running on Solaris or Linux, there are convenient scripts available to you to start, stop, and restart Apache. These are kept in the Apache/bin directory, directly below the Lyris directory. For example, from that directory, you would run:

./stop

or

./start

or

./restart

Depending on what you need to do.
Windows Specific Tools If you are running on Windows, you may have need for several different command line tools. For example, on Windows you can start Apache in the foreground very easily by issuing the following command from the Apache directory:

apache

Running Apache using a terminal window is good for debugging, however it blocks that shell. You can, of course, type Ctrl+C to kill that job, but in that case Apache won't exit cleanly. Ideally, you should open another command window and cd to the Apache directory, then run the command:

apache -k shutdown

If you are running a version of Windows that supports services, such as Windows NT or Windows 2000, you can install Apache as a service using the following command:

apache -d path_to_apache -i

In the above example, the path_to_apache variable should be substituted by the path to your Apache directory. Thus, if you accepted the defaults in your install, this command will look like:

apache -d C:\lyris\apache -i

If you want to uninstall the Apache service, run the following command:

apache -u

If the Apache service is installed, and you want to quickly start and stop it without using the "Services" applet, you can use the "net" utility provided by Windows. The syntax of the "net" command, with respect to stopping and starting services, is:

net [stop | start] apache

how to get Heapdump in Weblogic

to get Heapdump in weblogic we have to set the follwoing parameters.

-XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=D:\Heapdump

Jrockit arguments

-Xmanagement:autodiscovery=true,authenticate=false,port=7091,ssl=false  -XX:FlightRecorderOptions=defaultrecording=true

change connectionpool URL with WLST

###################****##############****######################## 
# Generic script applicable on any Operating Environments (Unix, Windows) 
# ScriptName    : ChangeConnectionPoolURL.py 
# Author        : Madhusudhana Chilipi 
###############     Connecting to Start     ################################# 

connect('weblogic','welcome1','t3://localhost:7001')
cd('Servers/AdminServer')
edit()
startEdit()
cd('JDBCSystemResources')
allDS=cmo.getJDBCSystemResources()

###############     Changing the Datasources     ################################# 

for tmpDS in allDS:
    dsName=tmpDS.getName();
    print  '************* Changing URL for DataSource ', dsName     
    cd('/JDBCSystemResources/'+dsName+'/JDBCResource/'+dsName+'/JDBCDriverParams/'+dsName+'')
    set('Url','jdbc:oracle:thin:@localhost:1521:xe')
    print("************* URL has been Changed for DataSource: ", dsName)
    print ('')
    print ('')
save()
activate()

###############     End    ################################# 
   
   
   
   
   

Domain Migration WLST Script

readTemplate('c:/bea910/user_projects/templates/migration.jar')
writeDomain('C:/bea/user_projects/domains')
closeTemplate()
readDomain('C:/bea/user_projects/domains')
ls()
cd('Server')
ls()
cd('AdminServer')
set('ListenAddress','127.0.0.1')
set('ListenPort',10005) # Changing Admin Server ListenPort
set('Name','newAdmin') # Changing Admin server name

updateDomain()
closeDomain()

Deployment WLST Script

##################****##############****######################## 
# Generic script applicable on any Operating Environments (Unix, Windows) 
# ScriptName    : deploy.py 
# Author        : Madhusudhana Chilipi 
###############     Connecting to AdminConsole     ################################# 

print '*********connecting to the AdminConsole*********'
connect('weblogic','weblogic1','t3://localhost:7001')

###############     Deploying applicaiton1    ################################# 

print '*********deploying applicaiton1********'

deploy('benefits', 'C:/SOFT/benefits.war', targets='Server1')


###############     Starting the applicaitons   ################################# 
startApplication('benefits')

exit()

JMS Monitering WLST Script

#########################################################################
#
# This script will monitor a queue over time
# Author : Madhusudhana Chilipi
#
########################################################################
from java.util import Date
     
def JmsStat():
connect('weblgoic,'weblogic1','t3://localhost:7001')
serverRuntime()
servername = 'Server1'
while 1:
cd('/JMSRuntime/' + servername + '.jms/JMSServers/myJmsServer_1/Destinations/jmsmodule!myJmsServer_1@MQGEOQueue')
messagesCurrentCount= cmo.getMessagesCurrentCount()
messagesTotal= cmo.getMessagesReceivedCount()
cd('/JVMRuntime/'+servername)
heapfree = cmo.getHeapSizeCurrent()
date = Date() # now
print '%14s   %5d %6d %12d' %  (date, messagesCurrentCount, messagesTotal, heapfree)
java.lang.Thread.sleep(10000)
     
     
if __name__== "main":
redirect('jmsmonitor.log', 'false')
JmsStat()

Orace SOA & Weblogic Interview Questions

·        

1. Define relation between Oracle SOA Suite and Weblogic.

·         Weblogic Administration:

Manage a WebLogic Server installation.
To install weblogic server in one or multiple instances
Installing on single or multiple physical machines
How to handle administration console, utilities, APIs, hangling security, database connection, messaging and transaction.
How to do runtime configuration for your applications.
How to use the monitoring tools to check the health of the servers and ensure maximum availability and performance.
Install and Configure WebCache 11g as Load Balancer

and Much more..

OFM SOA Administrator:

·         Manage a WebLogic Server installation (Administration Server and Managed Server).
To install weblogic server in one or multiple instances
Installing on single or multiple physical machines
How to handle administration console, utilities, APIs, hangling security, database connection, messaging and transaction.
How to do runtime configuration for your applications.
How to use the monitoring tools to check the health of the servers and ensure maximum availability and performance.

and

File System and Directory Structure in Fusion Middleware
Installing Oracle Database, Configuring RCU, weblogic server and SOA Suite.
Deploying SOA Applications.
Deploying and Undeploying Java EE Applications
Configuring Node Manager and starting Managed Servers using Node Manager
Monitoring OFM Server, admin server, managed server and composites
Configuring HA and Security (Creating users, assigning responsibilities)
Monitoring performance of SOA composites
Install and Configure WebCache 11g as Load Balancer

·        

2. Functional differences between Fusion EM console and WLS Admin console.

·         http://weblogicandsoaadmin.blogspot.in/2012/02/soa-11g-em-console-performance-issues.html

3. List some key Fusion Middleware 11g products and their usage in brief.

4. Define key components/building blocks/basic architecture of Oracle SOA Suite.

5. Explain concept of domains, admin, managed server in Weblogic.

6. Difference between Weblogic Development and Production mode.

7. Explain Node Manager in Weblogic.

8. Key functionality of Nodemanager.

9. What are the different types of nodemanager?

10. What is the default port number of nodemanager?

11. Mention the path for Nodemanager home.

12. Explain some properties present in nodemanager.properties file.

13. Is Nodemanager setup mandatory in a standalone WLS installation?

14. Is nodemanager setup mandatory in a clustered WLS environment? If not what are the demerits.

15. Explain the functionalities of Node manager in a clustered WLS environment.

16. Explain the term managed Server Independence mode.

17. Can I start a managed server even if Admin server is down?

18. Can I make configurationally changes to managed server if admin server is down?

19. Explain significance of admin server in a WLS domain.

20. Why do you think Oracle recommends not deploying applications to Admin server in production environments?

21. Explain different ways of starting or stopping WLS Admin/managed server.

22. What is config.xml? Where can I find it?

23. You deployed a faulty code to Admin server which brought it down. You are not able to restart it. How would you undeploy the faulty piece of code then?

24. How do I clear cache for a WLS managed/Admin server?

25. What is meant by data source?

26. Explain how would you tune a data source and apply some best practices to it.

27. Explain difference between multicast and unicast IP.

28. Explain hardware requirement for a WLS 2 node cluster.

29. How do you configure OHS/Apache web server for a 2 node WLS cluster?

30. What is the role of mds in ofmw?

31. What are the main components of ofmw and their usage in brief?

32. Explain the procedure for installation of ofmw components in a cluster environment?

33. What is a SOA composite?

34. Path of the server related log files

35. What is synchronus and asynchronous process in BPEL

36. Basic commands in solaris like checking the CPU usage RAM consumption

37. Basic questions on database

38. List the various adapters used

39. What is SOA, Oracle SOA suite, BPEL, ESB

40. Designer for Business process

41. Difference between BPEL and ESB

42. Transactions and fault (exception) management

43. Run time components of SOA

44. Calling external web service

45. Calling asynch BPEL process within empty BPEL process

46. Combination of ESB and BPEL and third party web services

47. Java embedding

48. BPEL and OSB console

49. Adapter - concepts, integration, life-cycle mgmt., translation errors

50. Oracle E-Biz adapter and capturing event from oracle ERP

51. Fine tuning BPEL process

52. Deployment framework

53. Business rules and AIA

54. Email notification and rejection handler

55. Patches and installation - UNIX based and windows based

56. External resource management (example MQ shared library and third party jar files)

57. JMS and connection pools

58. Transformation and iteration

59. Which are the areas you think Oracle SOA fits perfectly

[Answer - EAI with real-time data transfer, need heavy data communication with rich business logic, Oracle ERP in existing environment]


60. Loose coupling and control at central point (orchestration vs. choreography)

• SOA 11g Admin - Interview Questions

1. Define relation between Oracle SOA Suite and Weblogic. 2. Functional differences between Fusion EM console and WLS Admin con...

• SOA 11g - SOA Admin Interview Questions 2

1.      How to know the Managed Servers status, when admin console is not available? 2.      What is the performance issue in weblogic ...

• SOA 11g Admin - SOA Installation Guide

Oracle Fusion Middleware 11g installation is broadly covered in 5 steps 1.     Create Repository 2.     Install Weblogic Server 3. ...

• Fusion Middleware - Differences between Oracle and IBM

Why Oracle Fusion Middleware is #1 in Middleware comparatively with IBM. Please access below the webcasts, white papers and other resour...

• Weblogic Admin Interview Questions-Part 1

1.   What is the default HTTP Port? 2.   What is the difference between production mode and development mode? What is weblo...

• SOA 11g - EM console performance issues

Scenario and Symptoms: The BPEL Engine Audit level is set to Development. The BPEL engine is load tested with some huge number of transac...

• Weblogic Admin Interview Questions-Part 2

1.       How to know the Managed Servers status, when admin console is not available? 2.       What is the performance issue in weblogi...

• SOA 11g - Best Practices

1)  Starting and Stopping a Managed Server       As a best practice, it is always recommended that you start and stop a managed ser...

• Weblogic 11g - Development Mode Vs Production Mode

While configuring any Weblogic domain the there are two modes the domain can be configured with. - Development Mode  - Product...

• Weblogic 11g - Performance & Tuning using JVisualVM

Monitoring Remote JVMs Using JVisualVM Real-time monitoring of a SOA/ADF 11g server Sun JVM can be provided by several tools. VisualV...

1) Starting and Stopping a Managed Server

      As a best practice, it is always recommended that you start and stop a managed server through one, but not both, of the following methods. Do not mix these methods, such as starting the managed server from the command line and stopping it from Oracle Enterprise Manager Fusion Middleware Control, or vice versa.

• Oracle Enterprise Manager Fusion Middleware Control

With this method, the node manager must be up and running. The node manager tracks all managed server startups and shutdowns performed from Oracle Enterprise Manager Fusion Middleware Control. With this method, the server state is not an issue.

• Command line

With this method, the node manager does not track the server state. Therefore, if you start the server from the command line and shut it down from Oracle Enterprise Manager Fusion Middleware Control, the Oracle WebLogic Administration Server accesses the node manager to determine its status, which returns a state of Unknown.


Perform the following steps to stop and start the server from Oracle Enterprise Manager Fusion Middleware Control.

1. Expand the WebLogic domain.
2. Select the managed server (for example, named soa_server1).
3. Select Control  --> Shut Down.
4. Select Control  --> Start Up

•  
• SOA 11g - Admin Interview Questions (2)

·         1.      How to know the Managed Servers status, when admin console is not available?

·         2.      What is the performance issue in weblogic and how can you resolve, explain in brief?

·         3.      What is the Digital Certificate? How do we generate a Digital Certificate? 

·         4.      What is Thread Dump? What is the UNIX command to take Thread Dumps?

·         5.      What is a cluster? What is High Availability and Fail over?

·         6.      How to handle out of memory in weblogic and if server is getting more requests then what we have to do in production environment?

·         7.      What is clustering? How do weblogic instances communicate in a clustered environment? In a cluster, if one of the servers has an issue and it is not accessible, will the other servers know about it and how?

·         8.      What are the roles you have played and what are the day today activities?

·         9.      WHAT IS TROUBLE SHOOTING IN WEBLOGIC?

·         10. How to integrate apache webserver with weblogic server? What is the purpose of integrating both?

·         11. Define the different groups of Users?

·         12. What are the different thread queues?

·         13. How will you analyze if a page responds slowly?        

·         14. What is Work manager? Explain briefly?

·         15. What are the different types of drivers?

·         16. What are the various types of log files?

·         17. What are you commonly used fine tuning commands?

·         18. What is Session replication? What are the different types of Session Replications?

·         19. What happens if we change config.xml while server is running?

·         20. What is HTTP tunneling?

·         21. What is asynchronous communication? Is there any synchronous communication in JMS?

·         22. How to find Weblogic Version?

·         23. What is the use of log4j?

·         24. What is Work manager?

·         25. What is virtual host?

·         26. What is eden size and perm size?

·         27. What is Weblogic shrink?

·         28. What is diff b/w JNDI and JDBC?

·         29. What are the different types of drivers?

·         30. What driver you are using?

·         31. What is diff b/w unicast and multicast?

·         32. When core dump will not be created even if the server crashed?

·         33. Can we change the heart beat interval?

·         34. What are the various types of log files?

·         35. What is WorkManager?

·         36. What is Multicast IP Address? What are the things done by it? How to

·         test multicast IP?

·         37. How to check whether the cluster multicast adress is available or not?

·         What is the command to check in UNIX environment?

·         38. What is Virtual Host in Weblogic, how to create it & what is the

·         advantage ?

·         39. How can you find the jdbc version on server side?

·         40. What you do to close the connections automatically in JDBC?

·         41. What are the things that we take care under Database fine tuning apart

·         from increasing or decreasing connections?

·         42. What is MBean, how many types are there?

·         43. How to restart proxy?

·         44. Reasons for server crash?

·         45. Reasons for servers hang?

·         46. What is the thread hogging?

·         47. Various garbage collection algorithms?

·         48. How to find whether the PORT No is free or not?

·         49. What is the command to find CPU utilization?

·         50. What is the command to find version of Unix?

·         51. How to find CPU utilization? What if top command doesn’t work?

·         52. What are you commonly used fine tuning commands?

·         53. What is the difference between webservers and Proxy server?

·         54. How to sort the files?

·         55. What is Session replication? What are the different types of Session Replications?

·         56. Which IP segment will you use for Multicasting?

·         57. Is it possible to manage multiple domains through a single weblogic

·         admin console?

·         58. What happens if we change config.xml while server is running?

•  
• SOA 11g - Configuration (3)

The intent of this note is to list the important configuration and log files used to diagnose SOA 11g problems.

Throughout this note we will refer to the following:
- $ MIDDLEWARE_HOME =
- $ DOMAIN_HOME = $ MIDDLEWARE_HOME/user_projects/domains/

Here is a list of files to look for:
1.Domain configuration under $DOMAIN_HOME/config  directory
   - Config.xml
   - jdbc/-Jdbc.xml
   - jms/-Jms.xml files under

2. Adapter configuration under $MIDDLEWARE_HOME//soa/connectors/   directory. ( Oracle_SOA1 is the default name)
  - AppsAdapter.rar
  - DbAdapter.rar
  - FtpAdapter.rar
  - MQSeriesAdapter.rar
  - SocketAdapter.rar
  - AqAdapter.rar
  - FileAdapter.rar
  - JmsAdapter.rar
  - OracleBamAdapter.rar

• 
  3. Admin Server log files under $DOMAIN_HOME/servers//logs  directory
   - Access.log
   - -Diagnostic.log
   - .log
  
  4. SOA Server log files under $DOMAIN_HOME/servers//logs  directory
   - . log
    - -Diagnostic.log
    - .log 
• SOA 11g - Installation Guide (1)
•  
• SOA 11g - Introduction (5)
• SOA 11g - Trouble Shooting Issues (9)

Issue:


while creating new domain in step select domain source I am getting "CFGFWK-64069 prerequisite missing: Oracle WSM Policy Manager 11.1.1.0 Oracle BI Composer Runtime , oracle BI-ADF runtime 11.1.1.0


Solution:


This could be because of higher security in windows vista/windows 7


Check file permission and owner of MW_HOME and subdirectory (reset permission of MW_HOME directory and subdirectory) .


If you are creating domain using command line config.cmd then start command promt in administrative mode and then try.

1. Define SOA and how do you explain it to a layman.
2. Deferentiate SOA from Oracle SOA Suite.
3. Define relation between Oracle SOA Suite and Weblogic.
4. Functional differences between Fusion EM console and WLS Admin console.
5. List some key Fusion Middleware 11g products and their usage in brief.
6. Key difference between Oracle SOA Suite 10g and 11g.
7. Define key components/building blocks/basic architecture of Oracle SOA Suite.
8. Explain concept of domains,admin,managed server in Weblogic.
9. Explain basic functionality of Application Servers eg WLS,OAS,Websphere.
10.Difference between Weblogic Development and Production mode.
11. Explain Node Manager in Weblogic.
12. Key functionality of Nodemanager.
13. What are the different types of nodemanager.
14. What is the default port number of nodemanager.
15. Mention the path for Nodemanager home.
16. Explain some properties present in nodemanager.properties file.
17. Is Nodemanager setup mandatory in a standalaone WLS installation.
18. Is nodemanager setup mandatory in a clustered WLS environment. If not what are the demerits.
19. Explain the functionalities of Nodemanager in a clustered WLS environment.
20. Explain the term managed Server Independence mode.
21. Can I start a managed server even if Admin server is down.
22. Can I make configurational changes to managed server if admin server is down.
23. Explain significance of admin server in a WLS domain.
24. Why do you think Oracle recommends not to deploy applications to Admin server in production environments.
25. Explain different ways of starting or stopping WLS Admin/managed server.
26. What is config.xml. Where can I find it.
27. You deployed a faulty code to Admin server which brought it down. You are not able to restart it.How would you undeploy the faulty piece of code then?
28. How do I clear cache for a WLS managed/Admin server.
29. What is meant by datasource.
30. Explain how would you tune a datasource and apply some best practices to it.
31. Explain difference between multicast and unicast IP.
32. Explain hardware requirement for a WLS 2 node cluster.
33. How do you configure OHS/Apache web server for a 2 node WLS cluster?
34. Explain basic steps for SSL configuration in WLS.
35. Explain JVM concept and detailed architecture.
36. What is the function of Permanent Generation (PermGen) space.
37. Explain OOM errors and what are the different causes.
38. Explain Memory Leaks. Explain how would you detect it. state examples of some tools to analyze it.
39. What would be your approach if you are asked to tune JVM.
40. Explain some key Sun JVM startup/tuning arguments.
41. State some JVM tuning properties that you would use in a multi threaded box like the Oracle T series so as to improve JVM performance.
42. Explain Garbage Collection. State some GC algorithms you are aware of.
43. What is the Verbose GC option used for?
44. Explain what would you do to mimimise frequent major GC.
45. Explain difference between major and minor GC.