Answer : Generation Data Group is a group of chronologically or functionally related datasets. GDGs are processed periodically, often by adding a new generation, retaining previous generations, and sometimes discarding the oldest generation.
Answer : A GDG base is created in the system catalog and keeps track of the generation numbers used for datasets in the group. IDCAMS utility is used to define the GDG base
Answer : The JOBLIB statement is placed after the JOB statement and is effective for all job steps. It cannot be placed in a cataloged procedure. The STEPLIB statement is placed after the EXEC statement and is effective for that job step only. Unlike the JOBLIB statement, the STEPLIB can be placed in a cataloged procedure.
Answer : Temporary datasets can be created either by not specifying any DSNAME or by specifying the temporary file indicator as in DSN=&&TEMP. We use them to carry the output of one step to another step in the same job. The dataset will not be retained once the job completes
Answer : Storage violation error - can be due to various reasons. e.g.: READING a file that is not open, invalid address referenced due to subscript error
Answer : All indicate dataset out of space. SD37 - no secondary allocation was specified. SB37 - end of vol. and no further volumes specified. SE37 - Max. of 16 extents already allocated.
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