Answer / guest

Data definition name is the eight character designation
after the // of the DD statement. It matches the internal
name specified in the steps executing program. In COBOL
that's the name specified after the ASSIGN in the SELECT
ASSIGN statement. Dataset name is the operating system (MVS)
name for the file.

Answer / sunitha

Data Definition name (ddname) is a eight character name
used to give the name to the DD statement. In COBOL, In
ENVIRONMENT DIVISION , INPUT-OUTPUT SECTION, FILE-CONTROL
paragraph, a SELECT statement defines a file name and
assigns a device name to it where the device name is the
ddname that is coded in the JCL.
Dataset name(dsname) is the operating system(MVS) name for
the file.

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