Interview questions Dump

collected from various websites

Set - 1
------------------------------

1) What are your daily day to day activities?

2) Describe the real time problems that u faced in your administration
Career?
3) Did u work with any tools which helps you to see the heap dump or
thread dump?
4) What is 202 error, 500 server error?
5) What is the generalized approach for Migration?
6) What is the difference between L1, L2, and L3?
The user submitted the request,
7) When that request is on processing in the middle the server
Crashes then what happens?
8) How do you verify that you are using Horizontal clusters not a
Vertical cluster?
9) What is vertical and horizontal scaling and their Advantages and
Dis-advantages (Key points)?
10) How to check the multiple NIC in Unix or Linux?
11) To specify the weight of a cluster member in which file we have to
Modify?
12) How do you find memory leaks? At what situation memory leaks
Occur –Give any examples? Is there any tool to find memory
leaks?

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Set-2
----------------------------------
1) Why do we create clusters? what is the use and can you explain multicasting?

2) Work manager role in WebLogic

3) Garbage collection in JAVA.

4) Datasource and Pooling concept?

5) JMS, connection factories and queues.

6) Apache configuration.

7) Trouble shooting question. How will you react when server is not responding?

8) memory management.
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Set-3
-------------------------------
How to set classpath ?
What is weblogic.jar file ?
What is cluster ? what are the benefits of a cluster ?
What are the different cluster algorithm and difference between them ?
What is cluster address ?
What is Multicast ?
What is unicast ?
Whart is the difference between multicast and unicast ?
What is the difference between vertical and horizontol clustering ?
What is JMS ?
What is a JMS server ?
What is SSL or what is the purpose of SSL ?
How to deploy an application ?
What are different staging modes and differences between them ?
What are the different forms of weblogic deployment files ?
What are the difference between jar, war and ear files ?
What is the difference between web.xml and weblogic.xml ?
What is virtual host ?
What is a machine ?
What is JNDI ?
What is t3 or functioning of t3 ?
What is MSI mode ?
What is connection pool ?
What is data source ?
What is the difference between Data Source and Multi Data Source ?
What is heap and how to define max and min heap size ?
what is the difference between heapdump, memorydump and thread dump ?
What is the impact on Managed server if admin server goes down ?
Is that possible to start Managed server if admin server is not running ?
How to change the weblogic password ?
What are deployment descriptors ?
What is autodeployment ?
What is exploded form of deployment ?
What is the difference between production and development mode ?
What are the differences between weblogic 10g and 11g versions ?
How to configure apache with weblogic ?
What are startup and shutdown classes ?
What is session replication and how to enable it ?
What is MBEAN ?
What is the difference between .out and .log file ?
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Set-4
------------------------------
Q11)   In how many ways you can do configuration changes?

Q12)  How can we make Node-manager to start during system startup?

Q13) What are Log filters and their uses?

Q14) Have you done any deployment? can you explain it in brief?

Q15) What type of information will be in web.xml, weblogic.xml and application.xml?

Q16) Is it possible to refresh static component of  a already deployed application without required to redeploy whole application?  — yes

Q17) How to edit config.xml file?

Q18) What is a connection pool and connection object?

Q19) What is JMS?  Tell some practical uses of it

Q20) What is persistent Messaging? Any practical example you can give.
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Set - 5
-----------------------
1) How many types of installations are there in weblogic ? Steps for installing weblogic in unix?  Advantage of using silent mode installation?
2) What is the command to create domain in configuration wizard? Steps for creating domain in configuration wizard?
3) What is the node manager? Advantage of using node manager ?
4) Default port number for admin, node manager and ssl ? Default multicast address? Multicast range?
5) How managed servers will communicate in cluster?
6) Difference between webserver and application server?
7) Difference between development mode and production mode?
8) Difference between unicast and mulicast?
9) What is MSI mode in weblogic? How to start managed server in msi mode ?
10) What is the difference between weblogic 8,9 and 10 versions?
11) What is the cluster in weblogic ? Cluster types and cluster algorithms ?
12) Deployment steps using admin console ?
13) Deployment using java weblogic.Deployer command?
14) Deployment using wlst?
15) What is clear cache in weblogic? when is it require to clear weblogic cache?
16) How do you take back up of existing domain ?
17) Steps for horizontal clustering?
18) What are the Deployment modes in weblogic?
19) steps for deploying applications using ant script?
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Set - 6
--------------------------
1).Two managed MS1, MS2 servers is there in a cluster how can you say that load is there on only one server?
2).if two managed servers is there Same Domain is configured in both servers, but one server is crashed then how can you create a domain with the same configuration?
3).Give me the real time scenario to configure weight based algorithm in a cluster?
4).what is the name of ticketing and monitoring tool used in your company?
5).Application is running and server is also running but the end user requests are not processed then how can you trouble shoot the problem?
6).How to configure the node manager?
7).how to find out which version of the operating system in stall in Server?
8).How to configure the cluster?
9).if you’re running the script to start the managed server how much time is tacking up the server?
10).how can you check the server status without using admin console, monitoring tool, log file?
11).how the session replication is going on?
12).how can you find out the system (CPU) usage?
13).how can you find out the total and java process details?
14).how can you find out the total memory (RAM)in system?
15).what are the activities performed in day?
16). Tell me something about your company?
17).what are the values tuned in web logic?
18).what are the frequently used commands UNIX commands?
19).how can you replace a character in a file? Means in a file I am an Indian in place of you can replace h?
20).differences between weblogic 8.x and 10.x?
21).what is the differences between multicast and unicast clustering?
22).what is the default web server port (HTTP port) number secure port number (HTTPS)?
23).default node manager port number?
24).if the application is not working how can you trouble shoot?
25).what is thread dump? When we collect the thread dump? How can you analyze the thread dump? What are the threads find in the thread dump?
26).what you will do when data source will down?
27).what are the data source states?
28).which protocol is used for the multicast communication?
29).which protocol is used for the unicast clustering?
30).what is the Default multicast port number?
31).if some servers in cluster are running some of them are down is it deployment is possible?
32).if today certificates are expired what you have to do?
33).what are the step to perform for server migration?
34).Is it possible two different versions of the same application deploy at the same time?
35). How can u provide the security in LDAP Server?
36).How can the cluster members will communicate?
37).How can u rotate the LOGs in midnight?
38).is ticket is raised by u or any else?
40).how can u work with ticketing tool?
41).what is the difference b/w web server and proxy server?
42).what is tuning how can  u performance the tuning  ?  (u told me the only peramereters, is there anything else)

43).difference between horizontal clustering, vertical clustering and where both are used?
44).What are the daily activities?
45).if data source is configured but then after DB server is not running then what is the state of data source?
46).How many ways to take the dumps ?
47).Scenario:I have 4GB RAM and i'm using 4 mng-servers while i'm starting the servers I have a msg OUT OF MEMORY. How can you fix it.
48).what is the tool u r using for thread dump and tell me how to work with it?
49).Tell me the errors u r getting in the browser like 500? How many errors are there? Explain?

50).How will u find if the connection pool is connected with database or not ? not by using the console?
51).if client send the request the web page is appeared at morning but when he sends the request at evening blank page is displaying so, what will u do at that time  ?
52).how can u get the deployment files from another box and from where u will get?
53). is necessary to change the jdbc connections number frequently  in production is there any chance to solve that, if we want to performance tuning on jdbc  ?
54).what is the default administration port number?
55).how can u find out how many files are opened in Unix box?
56).if the file is opened is it possible to apply tar command?
57).if server is tacking more amount of time to restart then how can you trouble shoot?
58).you are deploying application using weblogic.Deployer then SSL is configured then what are the parameters you pass with the weblogic.deployer?
59).if SSL is configured then which key is send to the client?
60).In SSL configuration what type of key algorithms is there?
61).How to connect to the remote machine?
62).what is the difference between heap dump and thread dump?
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Set - 7
---------------------------------
Roles and Responsibilities
1.   What are the roles you have played?
2.   What are the daily activities from day start to end?
3.   What else you know apart from Weblogic Admin?
General
4.   How do you set up classpath?
5.   How can we resolve the access the issue raised by development team?
6.   What is your project environment?
7.   What is Http tunneling?
8.   How many servers do you have?
9.   What is the OS in the production?
10.   Why node manager is required?
11.   What is the command to check whether the server is running or not
in the unix environment?
12.   What are the various types of log files?
13.   How to configure security certificates?
14.   What are various security certificates?
15.   What weblogic utils contains?
16.   What is workmanager?
17.   What is there in boot.properties?
18.   What is the tag which contains jvm args?
19.   Can we disable admin console?
20.   What is admin server? Uses of admin server?
21.   How can the admin console be disable before it is re-enable by WLST?
22.   Weblogic admin don't know the admin credentials of weblogic 8.1 UI..how can he get the credentials?
23.   What is advantage if silent mode installation...
24.   What is critical environment in weblogic?
25.   What is i3?
26.   What happen when we give www.abc.com in url(what is process)
27.   What is WLS T3 protocol?
28.   How to monitor the servers?
29.   What is difference between jboss and weblogic?
Instroduction:
30.   What is standard alone server and how to configure it?
31.   What is the use of t3 protocol?
32.   What are differences between 8x and 9x?
33.   What if we change the config.xml?
34.   Can we configure webserver and application server explicity?
35.   Difference between weblogic and webspere?
36.   How to start web logic server?
37.   Who provide the certification for the installation of weblogic
server in your environment?
38.   How can you upgrade the licence file?
39.   How many ways you can install weblogic?
40.   How many domains you can create?
Configuration
41.   How to create a domain?
42.   What is configuration management?
43.   What is domian and how can it work ?


Clustering
44.   What is clustering?
45.   What is Multicast IP Address? What are the things done by it? How to test multicast IP?
46.   What is session replication?
47.   What is is Jsession ID?
48.   What is heart beating?
49.   What is primary server and secondary server?
50.   what is a session?
51.   How to configure a cluster?
52.   Difference between horizontal and vertical cluster?
53.   How to check wheather the cluster multicast adress is available or
not?
54.   What is the command to check in unix environment?
55.   How do you do clustering in your environment?
56.   How admin server knows that the managed server is down?
57.   What does 'stub' mean in weblogic server?
58.   What happen when your database and proxy server are down and your weblogic server is up
59.   What is Virtual Host in Weblogic , how to create it & what is the advantage ?
Deployment
60.   What is the deployment descriptor?
61.   what type of applications we use to deploy in webserver?
62.   Do you have web.xml in .ear?
63.   Do we deploy jar file?
64.   What is the architecture for deploying the applications in unix
environment?
65.   What are the differences between JAR,WAR and EAR file?
66.   How to deploy applications?
67.   How many types of deployments?
68.   What happen if we deploy our component in weblogic server?
69.   What are the benefits of load order in the deployment of the application?
JDBC
70.   Difference between multiple pool and connection pool?
71.   How can you find the jdbc version on server side?
72.   What you do to close the connections automatically in JDBC?
73.   How to create Datasource? And uses of DataSource?
74.   Default connections ?
75.   What are the things that we take care under Database fine tuning apart from increasing or decreasing connections?
76.   What happens when database down in weblogic?
JMS
77.   What is MDB?
78.   What is file store and page store?
79.   How can you say JMS is slow in 9x, did you identify any changes in JMS configuration in 9x?
80.   Did you aware JMS configuration?
81.   how do you provide security for EJB's?
82.   What is MBean, how many types are there?
Apache configuration
83.   What is Load balancer?
84.   How to configure apache?
85.   How to configure proxy if multiple manager servers are there in cluster?
86.   How to restart proxy?
87.   What is important file in Apache plug in?
Troubleshooting
88.   hat is trouble shooting?
89.   What is immediate action when server hangs?
90.   How to proceed if we get in problem?
91.   What is your recent issue?
92.   How to you get a issues and how to resolve it?
93.   What is your latest L2 issue?
94.   How to resolve user access once you restart the managed servers?
95.   How to handle out of memory in weblogic and if server is getting more requests ?
96.   Which is the best tool for monitoring Weblogic server(WLS8)?
Performance Tuning
97.   What is performance tuning?
98.   How do you take Thread Dumps? When?
99.   How do you analyze low performance?
100.   What is garbage Collection? How does it work at JVM level?
101.   What is the thread hogging?
102.   What is the command to take Thread Dump?
103.   Did you face any out of memory error in your project?
104.   Can we increase thread count if required?
105.   How to find heap memory and how to set that?
106.   From where we can set heap memory?
107.   How to find virtual memory?(grep Memtotal /proc/meminfo)?
108.   Various garbage collection algorithms?
109.   How can u identify the out of memory problem and how to resolve it?
110.   What are your activities for fine tuning?
111.   What are the things to be take care under OS fine tuning?
112.   How to find Garbage Collection apart from Admin console?
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Set - 8
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1.What are the day to day activities?
2.How will you find the pid using a specific port number
3.What are all the exceptions you have seen in weblogic?
4.Where will you check whether the cluster is load balancing the request?
5.What is the use of multicast address?
6.Which IP segment will you use for Multicasting?
7.Where will you configure load balance in cluster?
8.How does the webserver talk with weblogic? How will you configure it ex apache
9.Suppose if you are getting 500 internal error what could be the problem and how you will resolve the issue
10.Suppose if you are getting a code 300 in the log file how the request is coming in to the application server
11.What is session replication in weblogic?
12.Can you be able to start and stop weblogic through console?
13.Is Managed server can be restarted independently when admin is down?
14.How would you find out whether there is a communication between Weblogic and Webserver?
15.What are the problems have you faced in the weblogic?
16.When you bring down the weblogic instance, if it is not coming down. what would be the next step to bring down?.
17.Where would you set the ulimt parameter in weblogic?
18.How would you check the weblogic instance whether the it is started or not?
19.what is JDBC connection pool? What are the familier driver type you know ?
20.In which scenario, You use connection factories?
21.Suppose I want to configure weblogic with  ports 9001 & 9002 is it possible ?
Is there any issue in using this particular ports?
22.   Which parameter is used for Heart Beat between the servers?
23.   While hitting a website if you get error like NSAPI error, in this scenario how do you trouble shoot? Where will be the problem?
24.   Have you deployed RAR files in weblogic?
25.   Is it possible to configure execute threads for each applications
26.   In case you get struck thread where will be the problem exist? And what is your resolution?
27.   Suppose if you have to find the IP address of client from where he hit the application or to find out whether weblogic is receiving request from particular IP address which log file we have to check
28.   To find out thread related information which logfiles you have to check
29.   Classpath related questions
30.   If we are adding a new jar file in a lib whether instance requires restart or not
31.   which are all the files used in weblogic for the basic security or what are all the files used as javasecurity files.
32.   Specify some important jar files in the weblogic server
33.   Is it possible to manage multiple domains through a single weblogic admin console
34.   which one u would start first either admin or managed server?
35.   How will you deploy a file
36.   Suppose in cluster one of the serverA is down which was processing a request.other serverB would take over the request.from where the server B will take the information and start the process from the point the serverA lost the process
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Set -9
-----------------------------
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?
row-by-row
cannot applicable for large tables
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Set -10
-----------------------------

1). If two managed servers is there Same Domain is configured in both servers, but one physical server is crashed then how can you create a domain with the same configuration?

2). Give me the real time scenario to configure weight based algorithm in a cluster?

3). If some servers in cluster are running some of them are down is it deployment is possible?

4). Is it possible two different versions of the same application deploy at the same time?

5). How to recover password in weblogic?

6). How to recover boot.properties?

7). How to recover serializedini.dat, if the file is corrupted?

8). How admin server knows that the managed server is down?

9). What you can do if multicast buffer is full and how you know that?

10). What is the Max amount of information that can be saved in a session object?

11). How do u differentiate a out of memory and memory leak issue?

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Set -11
-----------------------------

1) What are your daily day to day activities?

2) Describe the real time problems that u faced in your administration
Career?
--------------------------------
3) Did u work with any tools which helps you to see the heap dump or
thread dump?
4) What is 202 error, 500 server error?
5) What is the generalized approach for Migration?
6) What is the difference between L1, L2, and L3?
The user submitted the request,
7) When that request is on processing in the middle the server
Crashes then what happens?
8) How do you verify that you are using Horizontal clusters not a
Vertical cluster?
9) What is vertical and horizontal scaling and their Advantages and
Dis-advantages (Key points)?
10) How to check the multiple NIC in Unix or Linux?
11) To specify the weight of a cluster member in which file we have to
Modify?
12) How do you find memory leaks? At what situation memory leaks
Occur –Give any examples? Is there any tool to find memory
leaks?