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Mainframe Interview Questions & Answers - Learning Mode

Mainframe Interview Questions & Answers - Learning Mode

A mainframe (also known as "big iron") is a high-performance computer used for large-scale computing purposes that require greater availability and security than a smaller-scale machine can offer. The term originally referred to the large cabinets called "main frames" that housed the central processing unit and main memory of early computers. Later, the term was used to distinguish high-end commercial machines from less powerful units. Most large-scale computer system architectures were established in the 1960s, but continue to evolve.

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Following are sub categories for which Interview Questions & Answers are available under Mainframe Interview Questions & Answers - Learning Mode. Please select the appropriate sub-category:-

CICS Interview Questions & Answers (406) Learning Mode | Exam Mode

COBOL Interview Questions & Answers (197) Learning Mode | Exam Mode

DB2 Interview Questions & Answers (332) Learning Mode | Exam Mode

IDMS Interview Questions & Answers (43) Learning Mode | Exam Mode

IMS Interview Questions & Answers (45) Learning Mode | Exam Mode

JCL Interview Questions & Answers (189) Learning Mode | Exam Mode

VSAM Interview Questions & Answers (40) Learning Mode | Exam Mode


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Mainframe Interview Questions & Answers - Learning Mode
Try Mainframe Interview Questions & Answers - Exam Mode
Question: what is the diff between dbrm.lib and loadlib what r they used for

Answer: Normally when a COBOL-DB2 code is compiled, during pre-compilation process, all the SQL codes embedded in the COBOL code will be extracted and moved into a DBRM. The DBRM will be situated in a system library called DBRM.lib. Once the DBRM is created then binding of the DRBM happens where a package or a plan is created for a particular DBRM or set of DBRM's. After the binding is done. The COBOL code is compiled and the system generated a Object module. After the compilation, link editing take Source:
Question: What is difference between oracle and sqlserver ?

Answer: 1. Oracle runs on many platforms, SQL on Windows only
2. Oracle includes IFS (Internet File System), Java integration, SQL is more of a pure database
3. Oracle requires client install and setup (Not difficult, but very UNIX-like for Windows users)
4. SQL is #1 in Cost/Performance and overall Performance, although Oracle will refute that
5. Replication is much easier in SQL (I have been at clients where even the Oracle consultant couldn't get it working w/oracle)
6. Failov Source:
Question: What are different types of process in jcl?

Answer: 1. premap process
2. response process Source:
Question: What is IAM (Innovation Access Method) and why is it better than VSAM?

Answer: IAM is an very efficient file access method that can:
? reduce batch run times by 30-50%
? improve online response time by 30-50%
? reduce dasd usage by 30-50% Source:
Question: What is meant by impact analysis?

Answer: Say you have 4 requirements r1, r2, r3 and r4. r1 is dependant on r4, r3 is dependant on r2.

When you have a change request or a functionality change or a defect occurred in r1, As r1 is dependant on r4, their may or may not be an impact on the functionality of r4 as they both are interdependant. So whenever a functional change happens on a requirement which is dependant on the another requirement, analysing the other requirement r4 w.r.t the change request taken up for r1 would be called Source:
Question: REDEFINE uses the same storage area. What about RENAMES? A variable that renames a group of other variables occupies different storage or same??

Answer: REDEFINE Clause uses same memory space, thus saving memory storage.

RENAME doesn't use same memory location. The RENAMES clause provides the programmer with the capability of regrouping elementary data items. This will be using different memory allocation in the System. Use of the RENAMES clause is always signaled by the special 66 level number. Source:
Question: I have a table with 50 records and if i try to access 100th record what will be the result.?(cobol-db2 program)

Answer: No answer available currently.
Question: Is it a Mainframe Systems problem or a Network Systems problem?

Answer: It depends on where the problem is occuring. If no applications on the Mainframe can be accessed, then it probably is a Network Systems problem. If some applications on the Mainframe can be accessed while others are not available, then it probably is a Mainframe Systems problem. Source:
Question: How do I know which archived data sets are about to expire?

Answer: Expired archived data sets are purged monthly. To see a list of expiring data sets due to be purged, browse the data set Z03AF.ARCHIVE.PURGE.FORECAST Source:
Question: What will the PDS utility do for TSO?

Answer: PDS offers numberous tools for working with PDS datasets. To invoke enter TSO PDS. Two of the most useful tools are displaying a load modules history and expanding the directory blocks. Limited help is available by entering HELP on the command line. Source:
Question: suppose there are 5000 records ina flat file. how can we read files 2000 to 3000 using sort?

Answer: Code:

STOPAFT=1000 Source:
Question: Where and how to use JCL process(premap and response map)?

Answer: No answer available currently.
Question: how can we read the last 1000 records of a file using some sort utility?

Answer: We can STARTREC and ENDREC parameter of a SORT utility copy select records from a infile to outfile. Source:
Question: what is the maximum no of characterts that can be passed thru PARM in jcl?

Answer: maximum 100 characters can be passed through parm in jcl Source:
Question: why do we use S9(4) comp to define the PARM length and not s9(4)comp-3? which is better?

Answer: No answer available currently.
Question: What datasets are archived from disk and how long are they kept?

Answer: The archiving job runs when needed, selecting disk datasets that have not been accessed for various time periods. The selected datasets are moved to cartridges with a retention period of 2 years.
The default selection criteria is 60 days of inactivity, with the following exceptions:
? A43UF.** datasets - 120 days
? A91UF.** datasets - 120 days
? Q20*.** datasets - 180 days
? Z03%F.** datasets - 180 days
? Z21%F.** datasets - 180 days
? "TF" datasets - 21 days
? Source:


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Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
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