What is the main function of key-sequenced data set?

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What is a VSAM slot?

1 Answers  

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Suppose a generation of GDG gets created in a particular step of a proc. How would you refer the current generation in a subsequent step? What would be the disposition of this generation now?

2 Answers   IBM,

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In the COBOL SELECT statement for a KSDS what are the three possibilities for ACCESS?

3 Answers  

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to use the rewrite command, how should the vsam file be opened?

0 Answers   IBM,

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In vsam at the cluster creation for KSDS FREESPACE parameter is required but for ESDS FREESPACE parameter is not required ?

4 Answers   IBM,

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what are the codes returned by the ams (access method services) command during the execution in vsam?

0 Answers   IBM,

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Yes. Because the alternate key would first locate the primary key, which in turn locates the actual record. Needs twice the number of I/Os.

0 Answers  

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Explain the meaning and syntax for the START command. ?

4 Answers   IBM,

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Do primary key values have to be unique? Do alternate key values have to be unique?

1 Answers  

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OPEN INPUT StudentFile READ StudentFile AT END SET EndOfStudentFile TO TRUE END-READ PERFORM UNTIL EndOfStudentFile DISPLAY StudentId SPACE StudentName SPACE CourseCode SPACE YOBirth READ StudentFile AT END SET EndOfStudentFile TO TRUE END-READ END-PERFORM CLOSE StudentFile STOP RUN what will be output

0 Answers  

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how do you create an alternate index ?

0 Answers   IBM,

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