Mainframe preguntas y respuestas de entrevista
Pregunta 1. What is a JCL (Job Control Language) in mainframes?
JCL is a scripting language used to define and execute job streams on mainframe systems.
Example:
JCL: //JOBNAME JOB ... //STEP1 EXEC PGM=PROGRAM1
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Pregunta 2. Explain the purpose of COBOL in mainframes.
COBOL (Common Business Oriented Language) is a high-level programming language designed for business applications on mainframes.
Example:
COBOL code: MOVE 10 TO AMOUNT.
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Pregunta 3. What is VSAM (Virtual Storage Access Method) in mainframes?
VSAM is a file storage access method used in mainframes to organize and retrieve data efficiently.
Example:
VSAM definition: IDCAMS DEFINE CLUSTER ...
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Pregunta 4. Explain the function of CICS (Customer Information Control System) in mainframes.
CICS is a transaction processing system that provides services for running applications concurrently on mainframes.
Example:
CICS command: EXEC CICS READ FILE(...)
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Pregunta 5. What is the purpose of DB2 in mainframes?
DB2 is a relational database management system (RDBMS) used in mainframes for storing and retrieving data.
Example:
SQL query: SELECT * FROM TABLE_NAME WHERE COLUMN = 'VALUE';
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