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CIA Report Sequence Set Graphic Analysis

The sequence set analysis graph is produced only for key-sequenced clusters (since they are the only type that has an index). Its purpose is to give a graphic picture of the control intervals that comprise the sequence set portion of the index. Note that this does not include control intervals that are part of the index set, because these are not needed unless the data set is processed by keyed direct access.

This graph contains one print line for each control interval in the index's sequence set. The graph line can consist of four different print characters:

• An X represents header information overhead
• An F represents space used to hold free control interval pointers
• Spaces symbolize space, which is unused in the control interval
• An I represents space that is used to hold the compressed keys and pointers to the data control intervals.

A legend is printed under the final line of the graph to indicate the use of these characters. We will now take a closer look at each of these values.