TCS Mainframe Developer Interview Questions, Process, and Tips

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

• Static call is determined at compile time based on the declared type of the object.

• Dynamic call is determined at runtime based on the actual type of the object.

• Static call is faster but less flexible, while dynamic call is slower but more flexible.

The SORT command in Mainframe can be used to search for a string.

• Use the SORT command with the FIND keyword followed by the string you want to search for.

• Specify the input file and output file for the search operation.

• Example: SORT FILE(INPUT) USING(CTL1) COPY FIND FIRST 'SEARCHSTRING' OUTPUT FILE(OUTPUT)

Mainframe modernization process involves updating legacy systems to newer technologies while preserving critical business logic.

• Assess current mainframe environment and identify areas for modernization

• Develop a modernization strategy, including choosing the right technology stack

• Migrate data and applications to the new platform while ensuring minimal disruption to business operations

• Test the modernized system thoroughl...read more

Temporary files in JCL are used to store intermediate data during job execution.

• Temporary files are defined using DD statements in JCL.

• They are typically used to store data that needs to be processed or manipulated before being written to permanent files.

• Temporary files are often allocated with DISP=(MOD,DELETE) to ensure they are deleted after job completion.

Sort JCL utilities are used to sort data in Mainframe environment based on specific criteria.

• Use SORT utility in JCL to sort data in ascending or descending order

• Specify the key fields to sort on in the SORT statement

• Use INCLUDE and OMIT statements to filter data before sorting

• Use JOINKEYS utility to merge two or more sorted datasets based on key fields

COBOL is a high-level programming language used for business applications on mainframe computers.

• COBOL stands for Common Business-Oriented Language.

• It was designed in 1959 by CODASYL and is primarily used in finance, insurance, and government sectors.

• COBOL programs are divided into four divisions: Identification, Environment, Data, and Procedure.

• It uses English-like syntax and is known for its readability and self-docu