Tech Mahindra Mainframe Developer Interview Questions and Answers

Static call is resolved at compile time, while dynamic call is resolved at runtime.

• Static call is determined at compile time based on the code structure.

• Dynamic call is determined at runtime based on the actual object being referenced.

• Static call is faster as it does not require runtime resolution.

• Dynamic call allows for flexibility and polymorphism in programming.

• Example: In Java, static method calls are resolved at c...read more

Index is the position of an element in an array, while subscript is the value used to access that element.

• Index starts from 0 in most programming languages.

• Subscript is the value enclosed in square brackets used to access an element in an array.

• Example: In array arr = [10, 20, 30], arr[1] has index 1 and subscript value 20.

Job Control Language (JCL) is used to define and execute jobs on mainframe systems.

• JCL statements are used to specify the job to be executed, including input/output files, program to be run, and other job control parameters.

• Example: //JOBNAME JOB (ACCOUNT), 'DESCRIPTION',CLASS=A,MSGCLASS=X

• JCL statements are written in a specific format with keywords and parameters to define the job steps and execution flow.

• Example: //S

IDCAMS is the utility used to create a GDG.

• IDCAMS is a utility program used in z/OS to define and manage VSAM datasets, including GDGs (Generation Data Groups).

• To create a GDG using IDCAMS, you would typically write a JCL job that includes IDCAMS statements to define the GDG base and generations.

• Example: //STEP1 EXEC PGM=IDCAMS //SYSIN DD * DEFINE GDG(NAME(TEST.GDG) LIMIT(10) SCRATCH)

Handling complex situations in projects requires problem-solving skills, communication, and collaboration.

• Identify the root cause of the complexity

• Break down the problem into smaller tasks

• Collaborate with team members to brainstorm solutions

• Communicate effectively with stakeholders to manage expectations

• Prioritize tasks based on urgency and impact