Mainframes Interview Questions | Mainframes Interview Questions and answers

Mainframes Interview Questions list for experienced

What is DRDA ?
What is the function of DBCTL?
Write the difference between HIDAM and HDAM databases?
Name and explain the type of locks?
What will happen if both STEPLIB and JOBLIB are specified?
What is the need to code COMMITS in batch programs?
What parameters are used to control the free space in DB2?
Name the lockable units in DB2?
What will be the result if ON SIZE ERROR phrase is declared?
What is the importance of COMMON Attribute?

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What is Mainframes ?

Answer :

Questions : 1 :: What is DRDA ?

DRDA stands for Distributed Relational Database Architecture. DRDA is a connection protocol for relational database processing which IBM and vendor databases use. It consists of rules for...View answers

Questions : 2 :: What is the function of DBCTL?

It is used to access IMS files for CICS Transactions and it is an address space. PSBs, DBDs, IMS files and ACBs are fixed into DBCTL for file access. Now if an IMS call is generated by a...View answers

Questions : 3 :: Write the difference between HIDAM and HDAM databases?

HIDAM has a separate index file which is based on the root segment. This file has information regarding the pointer that marks the position of the data. On the other hand, HDAM file does not have...View answers

Questions : 4 :: Name and explain the type of locks?

There are three types of lock, namely: Shared – This type of lock permits two or more programs to read from the locked space but does not allow them to change it. Update – This lock...View answers

Questions : 5 :: What will happen if both STEPLIB and JOBLIB are specified?

JOBLIB is a Data Definition statement. It determines the location of the program, which called the EXEC statement. JOBLIB applies to all steps present in that whole job. It is not possible to use it...View answers

Questions : 6 :: What is the need to code COMMITS in batch programs?

COMMIT statements are used to release locks which are required for that unit of work, and then permit a new unit of work. In other words, if COMMITS are not coded in the program and the program has...View answers

Questions : 7 :: What parameters are used to control the free space in DB2?

Free space permits the addition of new rows. There are two parameters, which are used to control the free space in DB2, they are: PCTFREE – It defines the free space percentage that will be...View answers

Questions : 8 :: Name the lockable units in DB2?

DB2 implements locking on four types of units: Pages Indexes sub page Tables Table...View answers

Questions : 9 :: What will be the result if ON SIZE ERROR phrase is declared?

When the condition is true, the code written in the “ON SIZE ERROR” phrase is performed. During this process, the content of the destination field does not change. If this phrase is...View answers

Questions : 10 :: What is the importance of COMMON Attribute?

Its functions are utilized in nested COBOL programs. If COMMON attribute will not be specified, the nested programs will find it impossible to access the program. An example of COMMON program is...View answers

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Mainframes Interview Questions And Answers