MQ Interview Questions

Scenario 1

1. Tell me about self (or) take me through your resume?

2. What are the different types of Logs?

We have two types of logs.

1. Transactional logs:

2. Error logs.

3. Difference between Errors and Qmgr errors?

Errors: This will contain all S/W level errors and Information

QMGR: This will contains all the information of QMGR objects and errors

4. How you enable Trace?

* Or start a high detail trace for one queue manager:

strmqtrc -t all -t detail -m MY.QMGR

* Or start a high detail wrapping trace and limit the file size to 5MB :

strmqtrc -l 5 -t all -t detail -m MY.QMGR

# End all tracing:

endmqtrc -a

# Format the trace files:

dspmqtrc *.TRC

Or format wrapping trace files:

dspmqtrc *.TRC *.TRS

5. What does the FDC contain?

FDC File:Failure data capture, If any S/W related error occurs this file will be created, in FDC we have PROB_ID based on that we will find the solution in IBM Tech notes.

Probid

Userid

Application name

Major error code

Minor error code

Problem severity

Probtype

Process

5. Channel in doubt and in flight state?

The INDOUBT count specifies the number that was interrupted between phase-1 and phase-2 of the commit process. These must undergo forward recovery to ensure that resources modified by them are unavailable until their INDOUBT status is resolved.

 The INFLIGHT count specifies the number that neither completed phase-1 of the commit process nor began the process of backing out. These must undergo backward recovery to restore resources modified by them to their previous consistent state

7. Sequence number wrap?

This is the highest number the message sequence number reaches before it restarts at 1.

The value of the number should be high enough to avoid a number being reissued while it is still being used by an earlier message. The two ends of a channel must have the same sequence number wrap value when a channel starts up; otherwise, an error occurs.

The value may be set from 100 through 999 999 999

7. Difference between Full & Partial Repository?

Full repository: This will contains all the information of Cluster QMgrs and other objects.

Partial repository: This will Contains the information of that particular Qmgr and Other instances for communication.

9. Where do we find the cluster information?

We have one Queue i.e SYSTEM.CLUSTER.REPOSITORY.QUEUE, in that all the cluster info will stored

10. What does contain in Auto define channel?

It contains channel name, port No. and Ip address That are mentioned in the Receiver channel

11. What is the backup Queue of the QMGR?

Dead letter queue

12. How you set Authentication?

Using SETMQAUT, this is used assign permissions to the user

SETMQAUT -M QMname -n objname -t objtype -p principle/-g group +all

dmpmqaut -m qmname -n objectname -t objecttype -p user to display set of all users given permission on the object

dspmqaut ------ to display set of all the permission for the user on the object

13. Will you give permission only for USER or GROUP, if GROUP why?

We can assign permissions to user and if you want assign permissions to group also.if asign permissions to group that are assign the entire user who are under that group.

14. Difference between Receiver & Requester channel?

Requester and Receiver are same except that the requesters can start the sender from requester side.

14. Why do we go clustering?

We have so many advantages using cluster

1. Administration task will be reduced

2. Work load balancing

3. Increase resource utilization

4. High availability

16. Components of the cluster?

Clussdr and clusrcvr channels

SYSTEM.CLUSTER.REPOSITORY.QUEUE

SYSTEM.CLUSTER.COMMAND.QUEUE

SYSTEM.CLUSTER.TANSMISSION.QUEUE (NOTE: Don’t disable the put or get attribute on cluster)

17. Which types of Logs are using in your Organization?

Depending upon client requirement we are using both linear and circular loggings

18. How you check the Status of the Queue?

dis qs(qname) type(handle)

19. Default path of the Error logs & Transaction Logs?

In Windows: \Program files\IBM/Web spear MQ\Log\ Qmgrs\active

C:\Program file\IBM\Web spear MQ\Qmgrs\QMname\Errors

In UNIX: /var/mqm/log/Qmgrs/active

/var/mqm/Qmgrs/Qmname/errors

19. What is the use of PROBID in Fdc?

Using ProbID: we can find the solution in IBM info center, If before anybody face that problem, otherwise we will rise PMR(problem management report) and it will contains Application name, major error, minor error and so on..

21. Difference stopping status of QMGRs?

End immediately, End abnormally, ended normally

22. How do you enable the Trigger?

We need to set some properties on queues

Trigger on, Trigtype (First/every/depth), Trigdepth, Trigdata(chalname), initq()

23. Which types of tickets do you mostly resolved?

Instant tickets

24. How to Suspend a Qmgr from the cluster?

Suspend qmgr cluster (clusname)

25. How to add existing Qmgr into the cluster?

If you add it as full repository, you need to add repos keyword to Qm, and create one clussdr and clusrcvr channels, add cluster attributes to other objects

If you want to add it as partial repository, create clusrcvr channel to that QM and a clussdr to a queue manager in full repository and set cluster attribute to objects

26. What is the use of alias queue?

This queue is act as reference queue to local, remote and cluster queue’s.

the advantage of alias queue is

1. Hide the details of reference queue to clients.

2. used for follow the naming conventions,

3. Provide different levels of access.

26A. Why do we give ‘Conname’ at Receiver Channel side in Cluster?

In cluster sdr channels are auto generated, based on the receiver channel attributes only the sdr channel will generated

27. How can you install all the Packages in Linux at a time?

rpm -ivh name of the packages with spaces

28. Tell me the process of installation on Windows and Linux?

on linux

df -k df -h to check the disk space

rpm (redhat package manager)

Create mqm userid and make mqm as its primary group.

the installation directory for mqm are opt/mqm

the working data is stored in var/mqm

./mqlicense.sh -accept --- to accept the license

then run the commands to install all the packages required. rpm -ivh packagename

rpm -ivh ( i- install v- verbose h- hash format)

to check the packages installed rpm -qa ! grep mq

ps -ef ! grep mq to end all the processes.

29. Difference between V5, V6 & V7?
30. Differences between persistent and non persistent messages?

1. Persistent msg’s are important, at any cost those must be deliver to destination QM,if any problem occur Those are placed in Xmitq or in DLQ.

2. Nonpersistent msg’s are not important; if any problem occurs those are discarded.

31. Types of tickets?

1. Instant tickets

2. Change order tickets

32. How many Qmgrs are in your current project?

Nearly 400.

33. How do you convert linear to circular?

We don’t have that type of operation if you want to change,

1. First stop the channels

2. Stop the Qmgr

3. Take the back up of qmanager using save queue manager

4. Delete the Qmgr

5. Recreate it with linear logging

6. Recreate all the queue definitions and give the permission to the queues

34. How many applications connect to your current project?

Display conn(*)

35. Reason codes for 2033, 2053, 2085, 2035, 2537…

2033: Msg not available

2053: Q full

2085: unknown obj name

2035: Not authorized

2537: channel not available

2016 (07E0) (RC2016): MQRC_GET_INHIBITED

2030 (07EE) (RC2030): MQRC_MSG_TOO_BIG_FOR_Q

2031 (07EF) (RC2031): MQRC_MSG_TOO_BIG_FOR_Q_MGR

2042 (07FA) (RC2042): MQRC_OBJECT_IN_USE

2051 (0803) (RC2051): MQRC_PUT_INHIBITED

2057 (0809) (RC2057): MQRC_Q_TYPE_ERROR

2058 (080A) (RC2058): MQRC_Q_MGR_NAME_ERROR

2059 (080B) (RC2059): MQRC_Q_MGR_NOT_AVAILABLE

36. What are the errors we can get at the time of installation?

1. user is not a member of mqm group.

2. Some mq series processes are running while installing.

 37. How do you connect MQ Client to MQ Server?

We have three types options for connecting client to server

1.MQCONNX

2.MQSERVER

3.Clientchannel tab

38. Qmgr attributes?

dEADQ,REPOS(),REPOSNL(),CLWLUSEQ(),MAXHANDS(),MAXPRTY()

39. What is listener and port?

Listener is a program running continuously listening for request msg from sdr

Port:unique entry point for a QManager

40. Where the configuration information stores on Linux and windows?

in windows it is stored at registry. in linux it is stored in mqs.ini file.

41. What is the difference between qm.ini and mqs.ini file?

A queue manager configuration file, qm.ini, contains information relevant to a specific queue manager. There is one queue manager configuration file for each queue manager. The qm.ini file is automatically created when the queue manager with which it is associated is created.

The WebSphere® MQ configuration file, mqs.ini, contains information relevant to all the queue managers on a WebSphere MQ installation. It is created automatically during installation. In particular, the mqs.ini file is used to locate the data associated with each queue manager

42. How do you configure the Qmgr before you install fix pack?

42. Difference between upgradation and migration?

---->An "upgrade" generally refers to an enhanced version of the software

---->if you migrate from a previous version of WebSphere MQ for Linux, you must uninstall your current version before installing WebSphere MQ Version

44. Which tool you use to connect with Linux and mainframes?

putty to connect to linux.

telnet or ssh to connect to mainframes.

44. How many channels we can create in Distribution Queuing for a Qmgr?

One sender and receiver channel

46. If you create 100 channels for a Qmgr… How can you create 101 Channel?

Normal way like:Define chl(chlname) chltype(type) conname(Ip&port)

47. How many years of experience you have?

3.3 YEARS

48. Are you supporting for L2 or L3?

l2

49. Who is your Vendor?

wipro

50. Who is your Client?

Carrefour

51. Project name?

Infrastructure engineering services [IES].

52. Which ticketing tool you are using?

BMC REMEDY,RADIX, OPEN HP view

53. Which monitoring tool you are using?

OMEGAMON XE , Q pasa, BMC Main View

54. Your monitoring and ticketing tools belong to?

BMC

55. Your mail server and chat server?

lOTUSNODES, sametime & Microsoft outlook, office communicator

56. At which location your L3 team will be?

Client location

57. How can you recover the damaged object and its syntax?

Using media recovery we can recreate damaged objects

rcrmqobj -m Qmname -t objtype -n objname

58. Channel attributes?

chltype(),discint(),batchhb(),trptype(),maxmsgl(),xmitq() conname() rqmname()

59. Different status of channel?

Initializing, binding, retrying, running, inactive, stopped, paused.

60. Are you supporting for 24*7 or on-call?

I have supported on-call.

61. Why do we go for MQ Client?

. No need for a full WebSphere MQ implementation on the client machine.

. Hardware requirements on the client system are reduced.

. System administration requirements are reduced.

. Application running on a client can connect to multiple queue managers on different systems.

. Alternative channels using different transmission protocols can be used

. Reduce the burden on other clients

62. In your company which Client-Server architecture is using?

63. Do you raise any PMR so far?

I have never raised PMR (problem management record)

64. Who send the tickets to you?

Users, application team, all the members who are involved in the current project

65. How do you escalate the ticket to L3?

66. Have you ever raised any tickets so far?

yes.

67. Have you ever raised change order?

no

68. Which flavor you are using on Linux?

Red hat

69. Differences between MQI and MSG Channels?

MQI channels are used between MQ client and MQ sever, those are bi-directional

Types: server connection channel

Client connection channel

MSG channels are Uni-directional, and used between QM

1. Sender

2. Receiver

3. Cluster sender

4. Cluster receiver

5. Server

6. Client

7. Requester

70. Default objects in Cluster?

SYSTEM.CLUSTER.REPOSITORY.QUEUE

SYSTEM.CLUSTER.COMMAND.QUEUE

SYSTEM.CLUSTER.TRANSMISSION.QUEUE & Queues and channels.

71. Difference between Dead-Letter Header and Handler?

If messages come to DLQ, QM will add dead letter header to msg, it contains reason for failure, destination queue and QM details such type of info’n

Using dead letter handler you pick the msgs from DLQ placed it in destination queue

72. What is sync point?

This is nothing but unit of work in two phase commit

73. Tell me something about unit of work?

The period of updates between two sync points is called unit of work.

74. Can you change the log file size?

No.

75. Where the latest information stores in error logs and why?

In the first file.

76. Can you increase the no. of error logs?

no

77. What is the command to check the disk space on Linux?

df -k df -h

78. Which command we use to check the installed packages on Linux?

rpm -qa | grep mq

79. Command to kill the process on Linux?

$ ps ux ----------to list all the processes.

$ kill -9 Pid -------------to kill particular process...

80. Do you run the runmqdlq program every time?

Depending upon the messages those are coming to the DLQ.

81. How can you check the listener port is running from your desktop?

NETSTAT -a

82. What is the use of telnet, ping and tracert?

Ping is used to check the status of remote channel.

Telnet is used for remote access of another system.

It shows path taken to reach a particular destination over a network.

83. How can you connect to remote server from your desktop?

Using MSTSC

84. How many primary and secondary logs we can create on windows & Linux (Max)?

Windows: primary file: 254, secondary: 253

Linux: primary files: 510, secondary: 509

85. Explain the concept of cluster workload balance?

86. What are the attributes of workload balance?

Defbind(notfixed)

Put()

clwluseq(local/any/QMGR)

clwlrank(0-9)

clwlprty(0-9)

clwlwght()

clwlmruse()

87. Explain client-server architecture?
88. What are the pre-requisites for MQ before install?

1. Hardware requirements----disk space

2. Software requirements----o/s specifications

89. Explain the process migration?
90. Have you ever done migration and how?
91. How can we take the Qmgr backup?

- create the backup queue manager

- copy the data and log files from your primary queue manager over the backup queue manager's data and logs

- flag backup qmgr as a backup and replay log extents (strmqm -r)

- Periodically copy over the log files prior to the CURRLOG value from the queue manager

saveqmgr -m MQ_BACKUP -r MQ_C1_01 -f MQ_C1_01.txt

92. Error log file name?

error log file name is:AMQERR01,AMQERR02,AMQERR03

93. What is the use of client channel tables?

Using client channel table we can connect with different QM’s and different clients will connect to single QM

94. How many max channels can connect to a Qmgr?

The default for maximum channels is 100 for qmgr. it can be set to higher in the qm.ini.

95. How can you find the max channels are connected to a Qmgr?

dis qmstatus conns

96. Channel components?

chltype() conname() trptype() xmitq() batchsz() hbint()

97. What is the use of trig data in channel?

98. What does initiation queue contain?

This will contains trigger massage generated by QM

99. How can we check whether the Qmgr contain Dead-latter queue or not?

DIS QMGR DEADQ(*)

99. How many servers, Qmgrs in your environment?

100servers. 400qmgrs.

101. Which programs you use for running the trigger monitor when you use your own initiation queue?(in application and channel triggering)

In application triggering we are using RUNMQTRM

in channel RUNMQCHI INITQ()

102. What is the default size of /var /mqm and /opt /mqm?

Allow 130 MB as a minimum for a WebSphere MQ server and 15 MB as a minimum for a WebSphere MQ client.

x-86 201 mb iseries -183

103. What is the difference between Control & Runmqsc Commands?

RUNMQSC commands are used with in Qm for creating Qm objects and altering QMGR.

CONTROL commands are used for creating starting and running QM, and for set authentication.

104. In Cluster for Round-Robin process defbind (open) what is happen?

If you set Defbind open, all msg’s are placed where the first msg is place

105. Explain the distributed queuing setup?
106. What is meant by distribution queuing?

107. What is difference between distribution and clustering?

In distributions queuing we have to create more no of objects like remote queues, Transmission queues and sender, receiver channels for every remote queue manager.

In clustering we can logically connect queue managers with the creation of less no. of Qmgr objects.

108. Why we go for clustering?

1. Simplifying system administration

2. Work load management

3. Less no of QM objects like RQD, channels.

4. High availability

109. In cluster we have 4 Qmgrs and having same instance in all Qmgrs I have to send messages to a particular Qmgr then how u configure?

Assign clwlrank and clwlprty for particular queue.

110. Tel me prerequisites for MQ admin?
111. R u configured SSL setup?

Yes. SSL address following important security considerations.

1. Authentication

2. Confidentiality

3. Integrity

To install and configure SSL we need

1. A server certificate key store. 2. An https connector

112. Which key u r using in SSL?

Symmetric key--- secret keys

Asymmetric key----------public private key pairs

113. What is the command to see the authentications?

DSPMQAUT: It will display the authenticated users

114. What may be reasons for getting channel is in retrying state?

1. If other side receiver channel is not defined

2. May channel was not started

3. Listener not yet started

115. What are the reasons for getting messages in dead letter queue?

1. If queue is full

2. Queue put inhibited.

3. Msg length is exceeded

116. What happen to messages (persistence& non persistence) if destination queue is full if there is no dead letter queue?

PERSISTENT: if queue is full, messages are coming back to Xmitq and channel will be going to retrying state.

NON-PERSISTENT: Those types of messages are discarded.

117. What is channel state in above case?

Retrying

118. Tel me some system default queues?

1. SYSTEM.DEFAULT.ALIAS.QUEUE

2. SYSTEM.DEFAULT.INITIATIONS.QUEUE

3. SYSTEM.DEFAULT.LOCAL.QUEUE

4. SYSTEM.DEFAULT.MODELS.QUEUE AND 5. SYSTEM.DEFAULT.REMOTE.QUEUE

121. Can we define remote queue definition without XMITQ? Is it working?

We can define remote queue definition without XMITQ, but XMITQ name should be remote Queue manager name.

121. Can we take the backup from XMIT queue massages?

When you are trying to get the backup of xmit queue massages,it will store error information the file. i.e 2016=MQRC_GET_INHIBITED.

122. How to take backup of massages from queue?

AMQSBCG Qname QMname > E:/mq

123. How to increase no. of primary and secondary log files size?

Go to registry edit, in that only you can change the number of primary and secondary files. After changing the number, immediately those are not affected, when the default primary files are full than only other files are come into picture.

    Scenario 2

INTERVIEW QUESTIONS

 Tell me about self (or) take me through your resume?

1. What are the different types of Logs?

We have two types of logs.

1. Transactional logs:

2. Error logs.

3. Difference between Errors and Qmgr errors?

Errors: This will contain all S/W level errors and Information

QMGR:This will contains all the information of QMGR objects and errors

4. How you enable Trace?

* Or start a high detail trace for one queue manager:

strmqtrc -t all -t detail -m MY.QMGR

* Or start a high detail wrapping trace and limit the file size to 5MB :

strmqtrc -l 5 -t all -t detail -m MY.QMGR

 # End all tracing:

endmqtrc -a

# Format the trace files:

dspmqtrc *.TRC

Or format wrapping trace files:

dspmqtrc *.TRC *.TRS

5. What does the FDC contain?

FDC File:Failure data capture,If any S/W related error occurs this file will be created,in FDC we have prob-Id based on that we will find the solution in IBM Tech notes.

probid

userid

application name

major error code

minor error code

problem civierty

probtype

process

6. Channel in doubt and in flight state?

The INDOUBT count specifies the number that were interrupted between phase-1 and phase-2 of the commit process. These must undergo forward recovery to ensure that resources modified by them are unavailable until their INDOUBT status is resolved.

 The INFLIGHT count specifies the number that neither completed phase-1 of the commit process nor began the process of backing out. These must undergo backward recovery to restore resources modified by them to their previous consistent state

7. Sequence number wrap?

This is the highest number the message sequence number reaches before it restarts at 1.

The value of the number should be high enough to avoid a number being reissued while it is still being used by an earlier message. The two ends of a channel must have the same sequence number wrap value when a channel starts up; otherwise, an error occurs.

The value may be set from 100 through 999 999 999 

8. Difference between Full & Partial Repository?

Full repository: This will contains all the information of Cluster QMgrs and other objects.

Partial repository: This will Contains the information of that particular Qmgr and Other instances for communication.

9. Where do we find the cluster information?

We have one Queue i.e SYSTEM.CLUSTER.REPOSITORY.QUEUE, in that all the cluster info will stored

10. What does contain in Auto define channel?

It contains channel name, port No. and Ip address That are mentioned in the Receiver channel

11. What is the backup Queue of the QMGR?

Dead letter queue

12. How you set Authentication?

Using SETMQAUT, this is used assign permissions to the user

SETMQAUT -M QMname -n objname -t objtype -p principle/-g group +all

dmpmqaut -m qmname -n objectname -t objecttype -p user to display set of all users given permission on the object

dspmqaut ------ to display set of all the permission for the user on the object

13. Will you give permission only for USER or GROUP, if GROUP why?

We can assign permissions to user and if you want assign permissions to group also.if asign permissions to group that are assign all the user who are under that group.

14. Difference between Receiver & Requester channel?

requester and reciver are same except that the reuqesters can starts the sender from requester side.

15. Why do we go clustering?

we have so many advantages using cluster

1.administration task will be redused

2.work load balancing

3.increase resource utilization

4.high availability

16. Components of the cluster?

Clussend and clusrcvr channels

SYSTEM.CLUSTER.REPOSITORY.QUEUE

SYSTEM.CLUSTER.COMMAND.QUEUE

SYSTEM.CLUSTER.TANSMISSION.QUEUE (Please do not disable the put or get attribute on cluster)

17. Which types of Logs are using in your Organization?

Depending upon client requirement we are using both linear and circular loggings

18. How you check the Status of the Queue?

dis qs(qname) type(handle)

19. Default path of the Error logs & Transaction Logs?

In windows:\Program files\IBM/Web spear MQ\Log\ Qmgrs\active

C:\Program file\IBM\Web spear MQ\Qmgrs\QMname\Errors

In Unix:/var/mqm/log/Qmgrs/active

/var/mqm/Qmgrs/Qmname/errors

20. What is the use of PROBID in Fdc?

Using ProbID: we can find the solution in IBM info center, If before anybody face that problem, otherwise we will rise PMR(problem management report) and it will contains Application name, major error, minor error and so on..

21. Difference stopping status of QMGRs?

End immediately, End abnormally, ended normally

22. How do you enable the Trigger?

we need to set some properties on queue’s

Trigger on

Trigtype (First/every/depth)

Trigdepth

Trigdata(chalname)

initq()

23. Which types of tickets do you mostly resolved?

instant tickets

24. How to Suspend a Qmgr from the cluster?

Suspend qmgr cluster (clusname)

25. How to add existing Qmgr into the cluster?

If you add it as full repository, you need to add repos keyword to Qm, and create one clussdr and clusrcvr channels, add cluster attributes to other objects

If you want to add it as partial repository, create clusrcvr channel to that QM and a clussdr to a queue manager in full repository and set cluster attribute to objects

26. What is the use of alias queue?

This queue is act as reference queue to local, remote and cluster queue’s.

the advantage of alias queue is

1. Hide the details of reference queue to clients.

2. used for follow the naming conventions,

3. Provide different levels of access.

Why do we give ‘Conname’ at Receiver Channel side in Cluster?

In cluster sdr channels are auto generated, based on the receiver channel attributes only the sdr channel will generated

27. How can you install all the Packages in Linux at a time?

rpm -ivh name of the packages with spaces

28. Tell me the process of installation on Windows and Linux?

on linux

df -k df -h to check the disk space

rpm (redhat package manager)

Create mqm userid and make mqm as its primary group.

the installation directory for mqm are opt/mqm

the working data is stored in var/mqm

./mqlicense.sh -accept --- to accept the license

then run the commands to install all the packages required. rpm -ivh packagename

rpm -ivh ( i- install v- verbose h- hash format)

to check the packages installed rpm -qa ! grep mq

ps -ef ! grep mq to end all the processes.

29. Difference between V5, V6 & V7?
30. Differences between persistent and non persistent messages?

1. Persistent msg’s are important, at any cost those must be deliver to destination QM,if any problem occur Those are placed in Xmitq or in DLQ.

2. Nonpersistent msg’s are not important; if any problem occurs those are discarded.

31. Types of tickets?

1. Instant tickets

2. Change order tickets

32. How many Qmgrs are in your current project?

Nearly 400.

33. How do you convert linear to circular?

we don’t have that type of operation if you want to change,

1. First stop the channels

2. Stop the Qmgr

3. Take the back up of qmanager using save queue manager

4. Delete the Qmgr

5. Recreate it with linear logging

6. Recreate all the queue definitions and give the permission to the queues

34. How many applications connect to your current project?

Display conn(*)

35. Reason codes for 2033, 2053, 2085, 2035, 2537…

2033: Msg not available

2053: Q full

2085: unknown obj name

2035: Not authorized

2537: channel not available

2016 (07E0) (RC2016): MQRC_GET_INHIBITED

2030 (07EE) (RC2030): MQRC_MSG_TOO_BIG_FOR_Q

2031 (07EF) (RC2031): MQRC_MSG_TOO_BIG_FOR_Q_MGR

2042 (07FA) (RC2042): MQRC_OBJECT_IN_USE

2051 (0803) (RC2051): MQRC_PUT_INHIBITED

2057 (0809) (RC2057): MQRC_Q_TYPE_ERROR

2058 (080A) (RC2058): MQRC_Q_MGR_NAME_ERROR

2059 (080B) (RC2059): MQRC_Q_MGR_NOT_AVAILABLE

36. What are the errors we can get at the time of installation?

1. user is not a member of mqm group.

2. Some mq series processes are running while installing.

37. How do you connect MQ Client to MQ Server?

we have three types options for connecting client to server

1.MQCONNX

2.MQSERVER

3.Clientchannel tab

38. Qmgr attributes?

dEADQ,REPOS(),REPOSNL(),CLWLUSEQ(),MAXHANDS(),MAXPRTY()

39. What is listener and port?

Listener is a program running continuously listening for request msg from sdr

Port:unique entry point for a QManager

40. Where the configuration information stores on Linux and windows?

in windows it is stored at registry. in linux it is stored in mqs.ini file.

41. What is the difference between qm.ini and mqs.ini file?

A queue manager configuration file, qm.ini, contains information relevant to a specific queue manager. There is one queue manager configuration file for each queue manager. The qm.ini file is automatically created when the queue manager with which it is associated is created.

The WebSphere® MQ configuration file, mqs.ini, contains information relevant to all the queue managers on a WebSphere MQ installation. It is created automatically during installation. In particular, the mqs.ini file is used to locate the data associated with each queue manager

42. How do you configure the Qmgr before you install fix pack?

43. Difference between upgradation and migration?

---->An "upgrade" generally refers to an enhanced version of the software

---->if you migrate from a previous version of WebSphere MQ for Linux, you must uninstall your current version before installing WebSphere MQ Version

44. Which tool you use to connect with Linux and mainframes?

putty to connect to linux.

telnet or ssh to connect to mainframes.

45. How many channels we can create in Distribution Queuing for a Qmgr?

One sender and receiver channel

46. If you create 100 channels for a Qmgr… How can you create 101 Channel?

Normal way like:Define chl(chlname) chltype(type) conname(Ip&port)

47. How many years of experience you have?

3.3 YEARS

48. Are you supporting for L2 or L3?

l2

49. Who is your Vendor?

wipro

50. Who is your Client?

Carrefour

51. Project name?

Infrastructure engineering services.

52. Which ticketing tool you are using?

BMC REMEDY,RADIX, OPEN HP view

53. Which monitoring tool you are using?

OMEGAMON XE , Q pasa, BMC Main View

54. Your monitoring and ticketing tools belong to?

BMC

55. Your mail server and chat server?

lOTUSNODES, sametime

Microsoft outlook, office communicator

56. At which location your L3 team will be?

Client location

57. How can you recover the damaged object and its syntax?

using media recovery we can recreate damaged objects

rcrmqobj -m Qmname -t objtype -n objname

58. Channel attributes?

chltype(),discint(),batchhb(),trptype(),maxmsgl(),xmitq() conname() rqmname()

59. Different status of channel?

initializing,binding,retrying,running,inactive,stopped,paused

60. Are you supporting for 24*7 or on-call?

i have supported on-call .

61. Why do we go for MQ Client?

. No need for a full WebSphere MQ implementation on the client machine.

. Hardware requirements on the client system are reduced.

. System administration requirements are reduced.

. Application running on a client can connect to multiple queue managers on different systems.

. Alternative channels using different transmission protocols can be used

. Reduce the burden on other clients

62. In your company which Client-Server architecture is using?

63. Do you raise any PMR so far?

i have never raised PMR(problem management record)

64. Who send the tickets to you?

users, application team, all the members who are involved in the current project

65. How do you escalate the ticket to L3?

66. Have you ever raised any tickets so far?

yes.

67. Have you ever raised change order?

no

68. Which flavor you are using on Linux?

Red hat

69. Differences between MQI and MSG Channels?

MQI channels are used between MQ client and MQ sever, those are bi-directional

Types: server connection channel

Client connection channel

MSG channels are uni-directional, and used between QM

1. Sender

2. Receiver

3. Cluster sender

4.cluster rceiver

5.server

6. Client

7.requster

70. Default objects in Cluster?

SYSTEM.CLUSTER.REPOSITORY.QUEUE

SYSTEM.CLUSTER.COMMAND.QUEUE

SYSTEM.CLUSTER.TRANSMISSION.QUEUE

Queues and channels.

71. Difference between Dead-Letter Header and Handler?

if msg’a are come to DLQ, QM will add dead letter header to msg,it contains reason for failure, destination queue and QM details such type of info’n

using dead letter handler you pick the msg’s from DLQ placed it in destination queue

72. What is sync point?

This is nothing but unit of work in two phase commit

73. Tell me something about unit of work?

the period of updates between two sync points is called unit of work.

74. Can you change the log file size?

No.

75. Where the latest information stores in error logs and why?

In the first file.

76. Can you increase the no. of error logs?

no

77. What is the command to check the disk space on Linux?

df -k df -h

78. Which command we use to check the installed packages on Linux?

rpm -qa | grep mq

79. Command to kill the process on Linux?

$ ps ux ----------to list all the processes.

$ kill -9 Pid -------------to kill particular process...

80. Do you run the runmqdlq program every time?

Depending upon the messages those are coming to the DLQ.

81. How can you check the listener port is running from your desktop?

NETSTAT -a

82. What is the use of telnet, ping and tracert?

ping is used to check the status of remote channel.

telnet is used for remote access of another system.

it shows path taken to reach a particular destination over a network.

83. How can you connect to remote server from your desktop?

Using MSTSC

84. How many primary and secondary logs we can create on windows & Linux (Max)?

windows:primary file:254 ,secondary:253

linux:primary files:510,secondary:509

85. Explain the concept of cluster workload balance?

86. What are the attributes of workload balance?

Defbind(notfixed)

put()

clwluseq(local/any/QMGR)

clwlrank(0-9)

clwlprty(0-9)

clwlwght()

clwlmruse()

87. Explain client-server architecture?
88. What are the pre-requisites for MQ before install?

1. Hardware requirements----disk space

2. Software requirements----o/s specifications

89. Explain the process migration?
90. Have you ever done migration and how?
91. How can we take the Qmgr backup?

- create the backup queue manager

- copy the data and log files from your primary queue manager over the backup queue manager's data and logs

- flag backup qmgr as a backup and replay log extents (strmqm -r)

- periodically copy over the log files prior to the CURRLOG value from the queue manager

saveqmgr -m MQ_BACKUP -r MQ_C1_01 -f MQ_C1_01.txt

92. Error log file name?

error log file name is:AMQERR01,AMQERR02,AMQERR03

93. What is the use of client channel tables?

Using client channel table we can connect with different QM’s and different clients will connect to single QM

94. How many max channels can connect to a Qmgr?

The default for maximum channels is 100 for qmgr. it can be set to higher in the qm.ini.

95. How can you find the max channels are connected to a Qmgr?

dis qmstatus conns

96. Channel components?

chltype() conname() trptype() xmitq() batchsz() hbint()

97. What is the use of trig data in channel?

which chnnel you want to up at trigger event fired.provide channel name

98. What does initiation queue contain?

This will contains trigger massage generated by QM

99. How can we check whether the Qmgr contain Dead-latter queue or not?

DIS QMGR DEADQ(*)

100. How many servers, Qmgrs in your environment?

100 servers. 400 qmgrs.

101. Which programs you use for running the trigger monitor when you use your own initiation queue?(in application and channel triggering)

In application triggering we are using RUNMQTRM

in channel RUNMQCHI INITQ()

102. What is the default size of /var /mqm and /opt /mqm?

Allow 130 MB as a minimum for a WebSphere MQ server and 15 MB as a minimum for a WebSphere MQ client.

x-86 201 mb iseries -183

103. What is the difference between Control & Runmqsc Commands?

RUNMQSC commands are used with in Qm for creating Qm objects and altering QMGR.

CONTROL commands are used for creating starting and running QM, and for set authentication

104. In Cluster for Round-Robin process defbind (open) what is happen?

if you set defbind open, all msg’s are placed where the first msg is place

105. Explain the distributed queuing setup?
     
     
106. What is meant by distribution queuing?

107. What is difference between distribution and clustering?

in distributions queing we have to create more no of objects like remoteqs. transmission ques and sender, reciever channels for every remote queue manager.

in clustering we can logically connect queue managers with the creation of less no.of qmgr objects .

108. Why we go for clustering?

1.simplifying system administration

2.work load management

3.less no of qm objects like rqd, channels.

4.high availability

109. In cluster we have 4 Qmgrs and having same instance in all Qmgrs I have to send messages to a particular Qmgr then how u configure?

assign clwlrank and clwlprty for particular queue.

110. Tel me prerequisites for MQ admin?

111. R u configured SSL setup?

yes.

ssl address following important security considerations.

1.authantication

2.confidentiality

3.integrity

to install and configure ssl we need

1. a server certificate key store.

2. an https connector

112. Which key u r using in SSL?

symmetric key--- secret keys

Asymmetric key----------public private key pairs

113. What is the command to see the authentications?

DSPMQAUT: It will display the authenticated users

114. What may be reasons for getting channel is in retrying state?

1. if other side receiver channel is not defined

2. may channel was not started

115. What are the reasons for getting messages in dead letter queue?

1.if queue is full

2. Queue put inhibited. 3.Mag’s length is exceeded

116. What happen to messages (persistence& non persistence) if destination queue is full if there is no dead letter queue?

PERSISTENT: if queue is full, msg are coming back to xmitq and channel will be going to retrying state.

NON-PERSISTENT: That type of msg’s are discarded.

117. What is channel state in above case?

retrying

118. Tel me some system default queues?

1.SYSTEM.DEFAULT.ALIAS.QUEUE

2.SYSTEM.DEFAULT.INITIATIONS.QUEUE

3.SYSTEM.DEFAULT.LOCAL.QUEUE

4.SYSTEM.DEFAULT.MODELS.QUEUE

5.SYSTEM.DEFAULT.REMOTE..QUEUE

119. can we define remote queue defination without XMITQ? is it working?

we can define remote queue defination without XMITQ,but XMITQ name should be remote Queue manager name.

121.can we take the backup from XMIT queue massages?

when you are trying to get the backup of xmit queue massages,it will store error information the file. i.e 2016=MQRC_GET_INHIBITED.

122.How to take backup of massages from queue?

amqbcg Qname QMname > E:/mq

123.how to increase no. of primary and secondary log files size?

Go to registry edit,in that only you can change the number of primary and secondary files.after changing the number ,imediatlly those are not effected,when the default primary files are full than only other files are come into picture.

  Scenario3

What is MQ and what does it do?Ans. MQ stands for MESSAGE QUEUEING. WebSphere MQ allows application programs to use message queuing to participate in message-driven processing. Application programs can communicate across different platforms by using the appropriate message queuing software products.What is Message driven process?Ans . When messages arrive on a queue, they can automatically start an application using triggering. If necessary, the applications can be stopped when the message (or messages) have been processed. 
What are advantages of the MQ?Ans. 1. Integration.2. Asynchrony3. Assured Delivery4. Scalability.How does it support the Integration?Ans. Because the MQ is independent of the Operating System you use i.e. it may be Windows, Solaris,AIX.It is independent of the protocol (i.e. TCP/IP, LU6.2, SNA, NetBIOS, UDP).It is not required that both the sender and receiver should be running on the same platform

What is Asynchrony?
Ans. With message queuing, the exchange of messages between the sending and receiving programs is independent of time. This means that the sending and receiving application programs are decoupled; the sender can continue processing without having to wait for the receiver to acknowledge receipt of the message. The target application does not even have to be running when the message is sent. It can retrieve the message after it is has been started.

What are the hardware and Software requirements for MQ Installation in AIX?
Ans. WebSphere MQ for AIX, V5.3 runs on any machine that supports the AIX V4.3.3 PowerPC® 32.bit, or AIX® V5.1 Power 32 bit only operating system.Disk Storage: Typical storage requirements are as follows:
1 Server installation: 50 MB
2. Client installation: 15 MB
3 Data storage (server): 50 MB
4. Data storage (client): 5 MB.

Software Requirements:
Operating system: The operating systems supported by WebSphere MQ for AIX, V5.3 are:
1. AIX V4.3.3, with PTF U472177, running in a 32 bit environment, on 32 or 64 bit hardware.
2. AIX V5.1, with PTFs U476879, U477366, U477367 and U477368, and APAR fix IY29345 running 32 bit kernel running on 32 or 64 bit hardware.
3. AIX V5.1, with PTF U476879, U477366, U477367 and U477368, and APAR fix IY29345 running 64 bit kernel running on 64 bit hardware.

Connectivity The network protocols supported by WebSphere MQ for AIX, V5.3 are:
1. TCP/IP
2. SNA LU 6.2.

Databases: DB2 7.1, 7.2
Oracle 8i and 9i
Sybase v12 or v 12.5
Java: If you want to use the Java Messaging Support, you need the Java Runtime Environment Version 1.3 or later

What are the software and hardware requirements for installing MQ on Windows?
Ans: MQ v 5.3 supports Windows 2000, Windows 2000XP, Windows 2000NT,
Windows 2003 SE, Windows 2003EE.
Disk Storage: Typical storage requirements are as follows:
1 Server installation: 50 MB
2. Client installation: 15 MB
3 Data storage (server): 50 MB
4. Data storage (client): 5 MB.

Connectivity The network protocols supported by WebSphere MQ for AIX, V5.3 are:
1. TCP/IP
2. SNA LU 6.2.
3. LU 6.2
4. NetBIOS

Databases: DB2 7.1, 7.2
Oracle 8i and 9i
Sybase v12 or v 12.5
Java: If you want to use the Java Messaging Support, you need the Java Runtime Environment Version 1.3 or later

what is a Message and what does it contain?
Ans: A message is a string of bytes that is meaningful to the applications that use it. Messages are used to transfer information from one application program to another (or between different parts of the same application). The applications can be running on the same platform, or on different platforms.

WebSphere MQ messages have two parts:
1. The application data. The content and structure of the application data is defined by the application programs that use it.
2. A message descriptor. The message descriptor identifies the message and contains additional control information, such as the type of message and the priority assigned to the message by the sending application. WebSphere MQ defines the format of the message descriptor. For a complete description of the message descriptor, 

What is the Max Length of the message does MQ support/
Ans: The default maximum message length is 4 MB, although you can increase this to a maximum length of 100 MB (where 1 MB equals 1 048 576 bytes). 

What is the difference between Persistent and Non Persistent Messages?
Ans: In Web Sphere MQ, messages can be either persistent or non persistent. Persistent messages are logged and can be recovered in the event of a WebSphere MQ failure. Thus, persistent messages are guaranteed to be delivered once and only once. Nonpersistent messages are not logged. Web Sphere still guarantees to deliver them not more than once, but it does not promise to deliver them once. 

What is the effect of using Persistant messages?
Ans: Persistent messages are usually logged. Logging messages reduces the performance of your application, so use persistent messages for essential data only. If the data in a message can be discarded if the queue manager stops or fails, use a nonpersistent message.

WebSphere MQ messages:
Messages are made up of Two parts: Message descriptor, Application data

Types of messages?
Datagram: A Message sent with no response expected.
Request: A Message sent for which a response is expected.
Reply: A Response Message for a requested message.
Report: A Message that describes the occurrence or eventEx COA/COD

Sizes ?
 

Qmanagerà10000 Msgs Maxmsglengthà4 Mb
Queueà5000 Msgs Maxmsglengthà4 Mb 

What is the attribute used to see the Message length?
Ans: MaxMsgLength 

What is MQ Client?
Ans: A Web Sphere MQ client is a component that allows an application running on a system to issue MQI calls to a queue manager running on another system. The output from the call is sent back to the client, which passes it back to the application.

 What is MQ Server?
Ans: A Web Sphere MQ server is a queue manager that provides queuing services to one or more clients. All the Web Sphere MQ objects, for example queues, exist only on the queue manager machine (the Web Sphere MQ server machine), and not on the client. A Web Sphere MQ server can also support local Web Sphere MQ Applications 

What are the Objects used in Web sphere MQ?
Ans: 1. Queue Manager

2. Queues
3. Channels

4. Processes

5. Name lists.

Mention the No of Characters required for creating names of the MQ objects?
Ans: For MQ Channels it is 20 Characters
For Remaining objects it is 48 characters.What about is the Default port number for MQ Queue Manager?
Ans: 1414

Difference between MQSC commands and Control commands?
MQSC Commands – These commands are used to handle the admin related functions for the components that are present in the MQ Series. In general MQSC commands are used for creating and maintaining Message channels, Queue Managers, Clusters etc…Control Commands – These commands are used to manage the processes and services that are helpful in the functioning of the MQ Series. In general these commands are used for Channel listener, Channel Initiator, Trigger monitor etc…

Is the MQSC attributes are Case sensitive?
Ans: MQSC commands, including their attributes, can be written in uppercase or lowercase. Object names in MQSC commands are folded to uppercase (that is, QUEUE and queue are not differentiated), unless the names are enclosed within single quotation marks. If quotation marks are not used, the object is processed with a name in uppercase.

SCRIPT COMMANDS:-
After entering in to queue manager we can find script commands.
Script commands are same for every queue manager.
(These Commands should be used in CAPITAL LETTERS)
· DEFINE :-To define/create MQ manager objects like queue,
Channels, process, and listener.
· ALTER :-to update or modify the existing objects
· DISPLAY :-to view all the properties of a particular object or to

Display all objects
· DELETE :-to delete created objects
· CLEAR :-to clear the message from the queue
· END :-to come out of the queue manager
· PING :-to check whether other side channel / queue manager is ready to accept our request.
· START :- to start the particular channel or listener
· STOP :-to stop particular channel or listener
· REFRESH :-used to refresh the security every time after giving or executing, set mgr or command for queue manager or object
· RESET :-used to reset channel,cluster,queue manager
· RESOLVE :-to resolve the channel which is in indoubt state
· SUSPEND :-to suspend a queue manager from a cluster environment
· RESUME :-to remove a queue manager from a cluster environment 

How can we write the MQSC commands that have too many parameters/
Ans: For commands that have too many parameters to fit on one line, use continuation characters to indicate that a command is continued on the following line:
1. A minus sign ( ) indicates that the command is to be continued from the start of _ the following line.
2. A plus sign (+) indicates that the command is to be continued from the first nonblank character on the following line.

What is programmable command format (PCF) commands?
These commands are issued from a programme for local or remote administration done by programmers. 

What are commands used for creating the Queue manager from the Command prompt?
Ans: crtmqm -q -d MY.DEFAULT.XMIT.QUEUE -u DEAD.LETTER.QUEUE QM1
Here -q used to define the Queue manager QM1 as a Default Queue manager
-d is used to define the default transmission Queue -u is used to define the default dead letter queue. 

How can U make the existing Queue Manager as an default Queue Manager?
Ans: On Windows systems, use the Web Sphere MQ Services snap-in to display the properties of the queue manager, and check the Make queue manager the default box. You need to stop and restart the queue manager for the change to take effect. 

Where the backup files are present after creating the Queue Manager?
Ans: Windows systems: If you use Web Sphere MQ for Windows NT and Windows 2000, configuration information is stored in the Windows Registry.UNIX Systems: 1. When you install the product, the Web Sphere MQ configuration file (mqs.ini) is created. It contains a list of queue managers that is updated each time you create or delete a queue manager. There is one mqs.ini file per node.
2. When you create a new queue manager, a new queue manager configuration file (qm.ini) is automatically created. This contains configuration parameters for the queue manager.

What is the command used for starting the Queue Manager?
Ans: strmqm QMName 

What is the command used for stopping the Queue manager?
Ans: endmqm -w QMName

The command waits until all applications have stopped and the queue manager has ended.

endmqm –i QMName
This type of shutdown does not wait for applications to disconnect from the queue manager. 

What’s the message code for Stopping a Queue Manager?
AMQ4044 Queue manager stopping 

What is the command used to delete the QueueManager?
Ans: dltmqm QMName 

Display the attributes of the Queue Manager QM1?
Ans: runmqsc QM1 Display qmgr

IBM Websphere MQ interview Questions Part 2

What is Queue?
Ans: A queue is a data structure used to store messages. A queue manager owns each queue. The queue manager is responsible for maintaining the queues it owns, and for storing all the messages it receives onto the appropriate queues 

what is the Default max Queue depth?
Ans: 5000

Types of Queues?

Local Queue

Remote Queues

Alias Queues
Model Queue

Dynamic Queues

Cluster Queues.

Queue: A safe place to store messages for Prior-To-Delivery, it belongs to the Qmgr to which the application is connected. 

Model Queue: Model queue is a template of a queue definition that uses when creating a dynamic queue. 

Alias Queue: Queue definition, which is Alias to an actual Local or Remote Q. Used for security and easy maintenance. 

Remote Queue: Object that defines a Queue belongs to another Q Manager (Logical Def). 

Initiation Queue: An initiation queue is a local queue to which the queue manager writes a trigger message when certain conditions are met on another local queue 

Dynamic Queue: Such a queue is defined “on the fly” when the application needs it. Dynamic queues may be retained by the queue manager or automatically deleted when the application program ends. Use- To store intermediate results. 

Cluster Queue: Custer queue is a local queue that is known throughout a cluster of queue managers. 

Reply-To-Queue: A request message must contain the name of the queue into which the responding program must put the Reply Message. 

Queue Manager: Provides Messaging services and manages the Queues, Channels, and Processes that belongs to it. 

Alias Q Manager: Queue-manager aliases, are created using a remote-queue definition with a blank RNAME.

 

What are the attributes required for the Remote Queue Definition?
Ans: 1.Name of the Queue

2. Transmission Queue Name.
3. Remote Queue Manager name

4. Remote Local Queue Name 

How can U define Queues in MQ?
Ans: Queues are defined to Web Sphere MQ using:
1. The MQSC command DEFINE
2. The PCF Create Queue command 

What is Transmission Queue?
Ans: Transmission queues are queues that temporarily store messages that are destined for a remote queue manager. You must define at least one transmission queue for each remote queue manager to which the local queue manager is to send messages directly. 

What is Initiation Queues?
Ans: Initiation queues are queues that are used in triggering. A queue manager puts a trigger message on an initiation queue when a trigger event occurs. A trigger event is a logical combination of conditions that is detected by a queue manager. 

What is Dead Letter Queue?
Ans: A dead-letter (undelivered-message) queue is a queue that stores messages that cannot be routed to their correct destinations. This occurs when, for example, the destination queue is full. The supplied dead-letter queue is called SYSTEM.DEAD.LETTER.QUEUE. For distributed queuing, define a dead-letter queue on each queue manager involved. 

What is the Max size that Queues support in MQ v5.3?
Ans.They support around 2GB of Size 

How can u create a Transmission Queue from a local Queue?
Ans. Change the usage attribute from normal to TransmissionDefine a Local Queue LQ using the MQSC Commands in the QM QM1
Ans: runmqsc QM1
Define qlocal (LQ) 

What are the Difference B/W Predefined & Dynamic Queues?
Ans: Queues can be characterized by the way they are created:
1. Predefined queues are created by an administrator using the appropriate MQSC or PCF commands. Predefined queues are permanent; they exist independently of the applications that use them and survive Web Sphere MQ restarts.

2 Dynamic queues are created when an application issues an MQOPEN request specifying the name of a model queue. The queue created is based on a template queue definition, which is called a model queue. 

What is the Algorithm followed in retrieving the Messages from the Queue?
Ans: 1. First-in-first-out (FIFO).
2. Message priority, as defined in the message descriptor. Messages that have the same priority are retrieved on a FIFO basis.
3. A program request for a specific message. 

What is Process Definition and what are the attributes does it contain?
Ans: A process definition object defines an application that starts in response to a trigger event on a WebSphere MQ queue manager. The process definition attributes include the application ID, the application type, and data specific to the application.
What is intercommunication and its components to send message ? 

What is Intercommunication?
Ans: In Web Sphere MQ, intercommunication means sending messages from one Queue manager to another. The receiving queue manager could be on the same machine or another; nearby or on the other side of the world. It could be running on the same platform as the local queue manager, or could be on any of the platforms supported by Web Sphere MQ. This is called a distributed environment.
Message channels Message channel agents
Transmission queues Channel initiators and listeners
Channel-exit programs

What is Distributed Queue Management (DQM).
Web Sphere MQ handles communication in a distributed environment such as this using DQM.The local queue manager is sometimes called the source queue manager and the remote queue manager is sometimes called the target queue manager or the partner queue manager. 

What is the Objects required for the DQM?
Ans: On source QueueManager:
1. Transmission Queue

2. Remote queue definition.
3. Dead Letter Queue(recommended)

4. Sender Channel

On Target Queue Manager
1. Local Queue

2. Dead Letter Queue

3. Receiver Channel 4.Listenr

***.The sender and receiver channels names should be same.

 What is channel and mention different types of channels in MQ?
Ans: Channels are objects that provide a communication path from one queue manager to another. Channels are used in distributed queuing to move messages from one queue manager to another. They shield applications from the underlying communications protocols. The queue managers might exist on the same, or different, platforms. Different types of Channels:
1. Sender-Receiver Channels
2. Requester-Server Channels
3. Client Connection channels
4. Server Connection Channels.
5. Cluster Sender.
6. Cluster Receiver Channels

What are MQI channels and there types?
MQI channels are the channels that carry messages from MQ Client application to the MQ server and vice versa.They are Bi-directional Channels
1. Server-connection

2. Client-connection

How many Channel Combinations?
1.Sender-receiver Channel
2.Requester-sender Channel
3.Cluster-Sender- Receiver Channel

4.Requester-server Channel

5. Server-receiver Channel

6.Client-Server Channel

What are the attributes required for the Sender Channel?
Ans: 1. The Name of the Channel
2. The Connection name

4.Transport Type

5.Scyexit 

What are different Channel status?
Ans: Channel Status:
1. Inactive
2. Running

3.Retrying

4.Stopped

What about Initializing & Binding states?
Ans: Before running state first the channel will initializes the listener & Binds with the Receiver Channel then it goes into running mode. 

Tell me Some Channel Attributes?
Batch Heartbeat Interval (BATCHHB): This heartbeat interval allows a sending channel to verify that the receiving channel is still active just before committing a batch of messages. If the receiving channel is not active, the batch can be backed out rather than becoming in-doubt, Batch interval (BATCHINT), Batch size (BATCHSZ), Channel type (CHLTYPE), Cluster (CLUSTER), Cluster namelist (CLUSNL), Connection name (CONNAME), Convert message (CONVERT), Disconnect interval (DISCINT), Heartbeat interval (HBINT), KeepAlive Interval (KAINT), Long retry count (LONGRTY), Long retry interval (LONGTMR), Maximum message length (MAXMSGL)

Why is Channel RETRYINT attribute used?
If a message is places in DLQ because of put inhibited or queue full condition, the DLQ handler attempts to put the message back to the destination queue. This interval is called as RETRYINT by default the retry interval is 60 seconds.
Receiver Cluster Receiver Requester

What is channel disconnect interval?
This is a time-out attribute, specified in seconds, for the server, cluster-sender, and cluster-receiver channels. The interval is measured from the point at which a batch ends, that is when the batch size is reached or when the batch interval expires and the transmission queue becomes empty. If no messages arrive on the transmission queue during the specified time interval, the channel closes down

Explain the channel attribute BATCHSIZE?
BATCHSIZE denotes the maximum number of messages that can be sent through a channel before taking a checkpoint. This parameter is valid only for channels with a channel type (CHLTYPE) of SDR, SVR, RCVR, RQSTR, CLUSSDR, or CLUSRCVR. The value must be in the range 1 through 9999. 

What is BATCH HEARTBEAT INTERVAL?
Ans: The batch heartbeat interval allows a sending channel to verify that the receiving channel is still active just before committing a batch of messages, so that if the receiving channel is not active, the batch can be backed out rather than becoming in-doubt, as would otherwise be the case. By backing out the batch, the messages remain available for processing so they could, for example, be redirected to another channel. 

What is Keep Alive Interval?
Ans: The Keep Alive Interval parameter is used to specify a time-out value for a channel. The Keep Alive Interval parameter is a value passed to the communications stack specifying the Keep Alive timing for the channel. It allows you to specify a different keep alive value for each channel. The value indicates a time, in seconds, and must be in the range 0 to 99999. 

What is LONG Retry count?
Ans: Specify the maximum number of times that the channel is to try allocating a session to its partner. If the initial allocation attempt fails, the short retry count number is decremented and the channel retries the remaining number of times.

What are the ways to start a channel?
Use the MQSC command START CHANNEL
Use the control command runmqchl to start the channel as a process
Use the channel initiator to trigger the channelType of channel states:
Inactive and Current- Stopped, Starting, Retrying and Active

What are the three options for stopping channels?
QUIESCE FORCE TERMINATE

What are the components of message channel?
A queue manager to communicate with another queue manager uses message channel. The components of a message channel are
1. Sender Message channel agent: Sender MCA is a program that transfers messages from a transmission queue to a communication link
2. Receiver MCA: It transfers messages from the communication link into the target queue
3. Communication protocol: Responsible for transferring messages A message channel is unidirectional. 

What is Message Channel agent (MCA)?
Ans: A message channel agent (MCA) is a program that controls the sending and receiving of messages. There is one message channel agent at each end of a channel. One MCA takes messages from the transmission queue and puts them on the communication link. The other MCA receives messages and delivers them onto a queue on the remote queue manager.
A message channel agent is called a caller MCA if it initiated the communication; otherwise it is called a responder MCA. 

What is Channel initiator and Listeners?
Ans: A channel initiator acts as a trigger monitor for sender channels, because a transmission queue may be defined as a triggered queue. When a message arrives on a transmission queue that satisfies the triggering criteria for that queue, a message is sent to the initiation queue, triggering the channel initiator to start the appropriate sender channel. You can also start server channels in this way if you specified the connection name of the partner in the channel definition. This means that channels can be started automatically, based upon messages arriving on the appropriate transmission queue.
You need a listener program to start receiving (responder) MCAs. Responder MCAs are started in response to a startup request from the caller MCA; the channel listener detects incoming network requests and starts the associated channel.

Channel Errors?
Due to: 1. Xmitq is set to get disabled

2. Network Issues
3.QueueManager Stopped

4. Listener is not running

5.TriggerTurned Off

Explain Channel-Exit programs and what are the types?
Channel-exit programs are called at defined places in the processing carried out by MCA programsSecurity Exit: You can use security exit programs to verify that the partner at the other end of a channel is genuineMessage Exit: Message Exit can be used for Encryption on the link, message data conversion, validation of user ID,Message-retry Exit: Message-retry exit is called when an attempt to open the target queue is unsuccessfulSender and receiver Exit: You can use the send and receive exits to perform tasks such as data compression and decompression

Channel auto-definition Exit Transport-retry Exit 

What is the Different Logging Methods available?
Ans: There are two different types available
1. Circular: The circular logging is used for restart recovery. It is the default logging method. Circular is used in Development and Testing Queues. Circular logging keeps all restart Data in a ring of log files. Logging fills the first file in the ring, then moves on to the and so on, until all the files are full. It then goes back to the first file in the ring and starts This continues as long as the product is in use, and has the advantage that you never run out of log files.

2. Linear: Linear logging gives you both restart recovery and media recovery. It is used in Production. Linear logging keeps the log data in a continuous Sequence of files. Space is not reused, so you can always retrieve any record logged from the time that the queue manager was created. As disk space is finite, you might have to think about some form of archiving. It is an administrative task to manage your disk space for the log, reusing Or extending the existing space as necessary. 

What is the Default location where the logs are stored and mention the default sizes?
Ans: Default location:
Windows: C:\Program Files\IBM\WebSphere MQ\log\qmgr
UNIX: /var/mqm/log 

What is the log file size?
Ans: In Web Sphere MQ for Windows NT and Win 2000, the minimum value is 32, and the maximum is 16 384. The default value is 256, giving a default log size of 1 MB.
In Web Sphere MQ for UNIX systems, the minimum value is 64, and the maximum is 16 384. The default value is 1024, giving a default log size of 4 MB. 

How will you change the log file size?
Ans ; You cannot change the log file size. For this you need to drop and re-create the queue manager. The number of log files primary & secondary can be changed but you need to restart the Q manager for the changes to take effect.

what is the number for log primary and secondary file allocated?
Ans: Primary log files: The number of primary log files to be allocated is 3 by default the minimum is 2 and MAX in Win 253 / Unix 510
Secondary log files: The number of secondary log files to be allocated is 2 by default the minimum is 1 and MAX in Win 252 / Unix 509 

What is the command used for creating the listener?
Ans: crtmqlsr -t tcp -m QMNAME -p portno 

What is the commands used for running listener in 5.3 Version?
Ans: runmqlsr -t tcp -m QMNAME -p portno 

What is command used to perform task on the MQ services?
Ans: amqmdain 

What are commands used on the Command server?
Ans: 1.strmqcsv: to start the command server
2. dspmqcsv: to display the command server
3. endmqcsv: To end the command server. 

Is there is any chance for the Message lost?
Ans: If the target queuemanager doesn.t contain the dead letter queue defined and if the messages are running on a fast channel and of non persistant,Then there is a chance of the message loss. 

What is the command that is used to provide authorization for the clients?
Ans: setmqaut -m QMName -t queue -n Queuename -p GUEST +all 

What are the common errors u get in DQM? Explain how to resolve ?
Ans: mqrc 2058: MQRC_Q_MGR_NAME_ERROR
Mqrc 2059: MQRC_Q_MGR_NOT_AVAILABLE.
Mqrc 2033: MQRC_NO_MSG_AVAILABLE.
Mqrc 2085: MQRC_UNKNOWN_OBJECT_NAME.
Mqrc 2009: MQRC_CONNECTION_BROKEN.
Mqrc 2043: MQRC_OBJECT_TYPE_ERROR.
Mqrc 2086: MQRC_UNKNOWN_OBJECT_Q_MGR.
Mqrc 2035: MQRC_NOT_AUTHORIZED. 

What are different modes in which a application can connect to a Queuemanager?
Ans: 1.Binding mode: In binding mode, also known as server connection, the communication to the queue manager utilizes inter-process communications. One of the key factors that should be kept in mind is that binding mode is available only to programs running on the MQSeries server that hosts the queue manager. A program using binding mode will not run from an MQSeries client machine. Binding mode is a fast and efficient way to interact with MQSeries. Certain Facilities, such as XA transaction co-ordination by queue manager, are available only in binding mode.

2. Client Connection: Client connection uses a TCP/IP connection to the MQSeries Server and enables communications with the queue manager. Programs using client connections can run on an MQSeries client machine as well as on an MQSeries server machine. Client connections use client channels on the queue manager to communicate with the queue manager. The client connection does not support XA transaction coordination by the queue manager. 

What are the different types of messaging systems used by JMS?
Ans: JMS applications use either the point-to-point (PTP) or publish/subscribe style of messaging.
Point-to-Point: Point-to-point messaging involves working with queues of messages. The sender sends messages to a specific queue to be consumed normally by a single receiver. In point-to-point communication, a message has at most one recipient. A sending client addresses the message to the queue that holds the messages for the intended (receiving) client.
Publish/Subscribe: In contrast to the point-to-point model of communication, the publish/subscribe model enables the delivery of a message to multiple recipients. A sending client addresses, or publishes, the message to a topic to which multiple clients can be subscribed. There can be multiple publishers, as well as subscribers, to a topic. 

Is It Possible to use one transmission Queue for the multiple message channels?
Ans: It is possible to define more than one channel per transmission queue, but only one of these channels can be active at any one time. This is recommended for the provision of alternative routes between queue managers for traffic balancing and link failure corrective action. A transmission queue cannot be used by another channel if the previous channel to use it terminated leaving a batch of messages in-doubt at the sending end. 

What is the command used to test whether the channel is active or not?
Ans: runmqsc QMName
Ping channel (channel name). 

What are the administrative commands that are used in Publish and Subscribe?
Ans: The strmqbrk command is used to start a broker. The first time this command is run on a queue manager, all the relevant MQSeries objects are automatically created.

——–strmqbrk -m MYQMGRNAME

The dspmqbrk command is used to check the status of the broker. Possible states are: starting, running, stopping, quiescing, not active and ended abnormally.

——–dspmqbrk -m MYQMGRNAME

The endmqbrk command is used to stop a broker. There are two options: -c requests a controlled shutdown (default), -i requests an immediate shutdown.

——-endmqbrk -i -m MYQMGRNAME 

What is multiple hoping?
Ans: If there is no direct communication link between the source queue manager and the target queue manager, it is possible to pass through one or more intermediate queue managers on the way to the target queue manager. This is known as a multi-hop.

What is Local administration and Remote administration?
Local Administration: Means carrying out administration tasks on any queue managers you have defined on your local system. 

Remote Administration: This allows you to issue commands from your local system that are processed on another system. For example, you can issue a remote command to change a queue definition on a remote queue manager. You do not have to log on to that system, although you do need to have the appropriate channels defined. The queue manager and command server on the target system must be running

Difference between Control Commands used in Windows and other Os?
Control commands on are case sensitive other OS but Windows they can be used any way.

What is MQOO_BIND_ON_OPEN option on the MQOPEN call ?
When this attribute is set it forces all the messages sent to this queue to be sent to the same instance of the queue (go to the same queue in cluster)

Difference between MQPUT and MQPUT1 call ?
The MQPUT1 call always operates as though MQOO_BIND_NOT_FIXED were in effect, that is, it always invokes the workload management routine.

When is Channel security exit program called?
Are called at MCA initiation and termination
Stopping unauthorized queue managers putting messages on your queues
Use OS security, Object Authority Manager (OAM) on WebSphere MQ user-written procedures

What happens if DEAD letter Queue is not defined?
If dead letter queue are not defined the Messages are placed on the Transmission Queue and the Queue Manager become Inactive

Explain Remote queue definitions? Advantages?
These are definitions for queues that are owned by another queue manager
Advantages: The advantage of remote queue definitions is that they enable an application to put a message to a remote queue without having to specify the name of the remote queue or the remote queue manager, or the name of the transmission queue. This gives you location independence.

What happens if channel terminates when fast non-persistent messages are in transit?
If a channel terminates while fast, non-persistent messages are in transit, the messages are lost and it is up to the application to arrange for their recovery if required. If the receiving channel cannot put the message to its destination queue then it is placed on the dead letter queue, if one has been defined. If not, the message is discarded.

 What happens when a message cannot be delivered?
Message-retry: If the MCA is unable to put a message to the target queue for a reason that could be transitory (for example, because the queue is full), the MCA has the option to wait and retry the operation laterReturn-to-sender: If message-retry was unsuccessful, or a different type of error was encountered, the MCA can send the message back to the originatorDead-letter queue: If a message cannot be delivered or returned, it is put on to the dead-letter queue (DLQ). You can use the DLQ handler to process the message
Recovery scenario –Disk Drive Full, damaged Queue manager object, Damaged single object, Automatic media recovery failure
MQ ensures that messages are not lost by maintaining records (logs) of the activities of the queue managers that handle the receipt, transmission, and delivery of messages

How to Process Messages from the Dead-letter-Queue?
We can Process the DLQ messages using runmqdlq command for sending messages to the destination Queues or target Queues. Use the runmqdlq command to start the dead-letter queue (DLQ) handler, which monitors and handles messages on a dead-letter queue.

runmqdlq QName QMgrName
Use the Dead-Letter-Queue-Handler to perform various actions on selected messages by specifying a set of rules that can both select a message and define the action to be performed on that message.
The runmqdlq command takes its input from stdin. When the command is processed, the results and a summary are put into a report that is sent to stdout. 

Which field of the MQDLH structure contains a reason code that identifies why the message is on the DLQ?
Reason field

What is completion code(MQCC) and reason code(MQRC)?
Completion code gives the status of the current transaction it can be 0, 1, 2. 0- for Successful completion (MQCC_OK), 1- Warning (MQCC_WARNING), 2- call failed (MQCC_FAILED). Reason code is that which gives the reason for which the transaction fails it can be MQRC_NONE, MQRC_BACKED_OUT etc.

What is Correl ID?
This is a byte string that the application can use to relate one message to another, or to relate the message to other unit of work that the application is performing. The correlation identifier is a permanent property of the message, and persists across restarts of the queue manager

Explain commit and Back Out units of work?
When a program puts a message on a queue within a unit of work, that message is made visible to other programs only when the program commits the unit of work.

 Commit: To commit a unit of work, all updates must be successful to preserve data integrity. If the program detects an error and decides that the put operation should not be made permanent, it can back out the unit of work. 

Back Out: When a program performs a back out, WebSphere MQ restores the queue by removing the messages that were put on the queue by that unit of work. The way in which the program performs the commit and back out operations depends on the environment in which the program is running

BackoutCount (MQLONG)?
This is a count of the number of times that the message has been previously returned by the MQGET call as part of a unit of work, and subsequently backed out. BackoutCount is the number of times the application tried and failed to put the messages in the Queue

 What is segmentation and explain segmentation Flag?When a message is too big for a queue, an attempt to put the message on the queue usually fails. Segmentation is a technique whereby the queue manager or application splits the message into smaller pieces called segments, and places each segment on the queue as a separate physical message. The application that retrieves the message can either retrieve the segments one by one, or request the queue manager to reassemble the segments into a single message that is returned by the MQGET call.

What are Namelist? when do you use it?
A namelist is a WebSphere MQ object that contains a list of other WebSphere MQ objects. Typically, namelists are used
1.By trigger monitors, where they are used to identify a group of queues.
2.Namelists are also used with queue manager clusters to maintain a list of clusters referred to by more than one WebSphere MQ object.
3. The advantage of using a namelist is that it is maintained independently of applications; it can be updated without stopping any of the applications that use it. Also, if one application fails, the namelist is not affected and other applications can continue using it. Namelists are also used with queue manager clusters to maintain a list of clusters referred to by more than one WebSphere MQ object

 What are name services?
The name service is an installable service that provides support to the queue manager for looking up the name of the queue manager that owns a specified queue. 

What is Local units of work (uses a single-phase commit process) and Global unit of Work (uses a two-phase commit process)?
Local unit of work: Units of work that involve only the queue manager are called local units of work. Syncpoint coordination is provided by the queue manager itself (internal coordination) using a single-phase commit process.

Use global units of work when you also need to include updates to resources belonging to other resource managers. Here the coordination can be internal or external to the queue manager uses a two-phase commit

How will we start a command server?
Depending on the value of the queue manager attribute, SCMDSERV, the command server is either started automatically when the queue manager starts, or must be started manually.
Start: Using strmqcsv saturn.queue.manager where saturn.queue.manager is the QM name
Display: dspmqcsv Stop: endmqcsvWhen we use CCSID attribute of the ALTER QMGR command to change the CCSID of the QM what are the components that need to be restarted?
Stop and restart the queue manager, stop and restart command server (A command server processes command messages) and channel programs

What is a MQ Series Queue manager Configuration file (qm.ini)?
A queue manager configuration file (qm.ini) to effect changes for specific queue managers. There is one qm.ini file for each queue manager on the node. (A queue manager configuration file, qm.ini, contains config information relevant to a specific queue manager. There is one queue manager configuration file for each queue manager. The qm.ini file is automatically created when the queue manager with which it is associated is created. For example, the path and the name for a configuration file for a queue manager called QMNAME is:/var/mqm/qmgrs/QMNAME/qm.ini)

What is name transformation in naming a Queue manager Configuration File?
A qm.ini file is held in the root of the directory tree occupied by the queue manager. For example, the path and the name for a configuration file for a queue manager called QMNAME is: /var/mqm/qmgrs/QMNAME/qm.ini A directory name is generated based on the queue manager name. This process is known as name transformation.

What is a Websphere MQ configuration file (mqs.ini)?
Contains information relevant to all the queue managers on the node. It is created automatically during installation (The WebSphere MQ configuration file, mqs.ini, contains information relevant to all the queue managers on the node. It is created automatically during installation. The mqs.ini file for WebSphere MQ for UNIX systems is in the /var/mqm directory. It contains: v The names of the queue managers v The name of the default queue manager The location of the files associated with each of them)

How can we edit the configuration files?
Automatically using commands that change the configuration of queue managers on the node, Manually using a standard text editor

When security checks are made?
Connecting to the queue manager (MQCONN or MQCONNX calls), Opening the object (MQOPEN or MQPUT1 calls), Putting and getting messages (MQPUT or MQGET calls), Closing the object (MQCLOSE)