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.
The concept of RRDS is similar to sequential access method, but it can access with data in random access and dynamic access.
Structure
RRDS is comprised of data records in sequence, with the record number indicating the record's logical position in the file. Operators can access records randomly by designating this positional number, or access records sequentially. Consequently, RRDS has the same function as Key Sequenced Data Set in the way of data set calling. The difference from Key Sequenced Data Set is that RRDS has no keys.
See also
References
- http://www.auditmypc.com/acronym/RRDS.asp
- http://www.jaymoseley.com/hercules/vstutor/vstutor.htm
- http://www.mvsforums.com/techfaqsvsam.html
- http://www.redbooks.ibm.com/redbooks/SG246105/wwhelp/wwhimpl/js/html/wwhelp.htm
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