In VSAM, a relative-record data set (RRDS) is always preformatted into fixed-length slots that contain unique relative-record numbers. These numbers indicate a record's relative position within the file. The RRDS record length is always fixed and equal to the length of the RRDS slot, which may or may not contain a record. Records can be added, updated, or deleted only within the predefined slots; no new slots can be added after the RRDS is formatted. Direct access to an RRDS is by relative-record number.
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