Relative record data set
Type of data set organization From Wikipedia, the free encyclopedia
A relative record data set (RRDS) is a type of data set organization used by IBM's VSAM computer data storage system.[1]: 5 Records are accessed based on their ordinal position in the file (relative record number, RRN).[1]: 29 For example, the desired record to be accessed might be the 42nd record in the file out of 999 total.
 | It has been suggested that this article be merged with Linear data set, Key-sequenced data set and Entry-sequenced data set to Virtual Storage Access Method. (Discuss) Proposed since March 2025. |
The concept of RRDS is similar to sequential access method, but it can access with data in random access and dynamic access.[clarification needed]
Structure
An RRDS consists of data records in sequence, with the record number indicating the record's logical position in the data set.[1]: 29 A program can access records randomly using this positional number or access records sequentially.[1]: 30 But unlike a Key Sequenced Data Set, an RRDS has no keys, so the program cannot access records by key value.
See also
References
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