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The Data file contains statistical information about datasets that have been processed by Control‑M/Tape. A dataset is identified by its name and the name of the job that created the dataset.
All record types in the Data file have a common header at the beginning of the record. This header contains the following information about the record:
Table 233 Header Information in Data File
Type |
Description |
|---|---|
RBA
|
Internal record location identifier. The format of the Control‑M/Tape RBA is ebbr. The first byte identifies the extent file number, the next two bytes identify the block number in the Data file, and the last byte identifies the record number in that block. |
Record Status Indicator |
Indicates whether the record is active or free. |
Each record in the Data file is assigned an RBA that indicates the location of the record in the Data file.
Access to a specific data file record can be performed using its RBA if known, or using the index. Access of a data record using its RBA is known as "non‑keyed access."
Note: Do not confuse the term "RBA," as used in this chapter, with the term "Relative Byte Address" used in IBM literature.
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