Relative Record Data Set

A Relative Record Data Set (RRDS) is a type of data set organization used by the VSAM computer data storage system. Records are accessed based on their ordinal position in the file (relative record number, RRN). For example, the desired record to be accessed might be the 42nd record in the file out of 999 total.

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The concept of RRDS is similar to sequential access method, but it can access with data in random access and dynamic access.

Structure

An RRDS consists of data records in sequence, with the record number indicating the record's logical position in the data set. A program can access records randomly using this positional number or access records sequentially. But unlike a Key Sequenced Data Set, an RRDS has no keys, so the program cannot access records by key value.

Keys may be used to access records in an RRDS by defining an alternate index.

gollark: … a quarter of an hour or so?
gollark: You can just use a microwave most of the time, even.
gollark: It's 15 minutes or so and you basically just have to move it/water between pots a few times.
gollark: For example, pasta is trivial to make and can be bought in bulk.
gollark: You could just cook food.

See also

References
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