Mainframe 面试题与答案
问题 11. What is the purpose of the DD statement in JCL?
The DD (Data Definition) statement in JCL is used to define the input and output data files for a job step.
Example:
DD statement: //INPUT DD DSN=INPUT.FILE,DISP=SHR
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问题 12. Explain the concept of a CICS transaction in mainframes.
A CICS transaction is a logical unit of work initiated by a user request or a program in the CICS environment.
Example:
CICS transaction definition: EXEC CICS START TRANSID('XYZ')
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问题 13. What is the purpose of the IEFBR14 utility in mainframes?
IEFBR14 is a dummy utility used for job steps that do not require any processing, mainly for job control purposes.
Example:
IEFBR14 JCL: //STEP1 EXEC PGM=IEFBR14
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问题 14. Explain the function of the ISPF (Interactive System Productivity Facility) in mainframes.
ISPF is a software product for interactive application development and provides a menu-driven interface on mainframes.
Example:
ISPF command: TSO ISRDDN
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问题 15. What is the purpose of the GDG (Generation Data Group) in mainframes?
GDG is a feature in mainframes used for version control and management of sequential datasets.
Example:
GDG definition: //OUTPUT DD DSN=MY.DATA.GDG(+1),DISP=(NEW,CATLG)
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