http://debianws.lexgopc.com/wiki143/index.php?action=history&feed=atom&title=Relative_record_data_setRelative record data set - Revision history2026-05-06T14:55:16ZRevision history for this page on the wikiMediaWiki 1.43.1http://debianws.lexgopc.com/wiki143/index.php?title=Relative_record_data_set&diff=1567525&oldid=previmported>AnomieBOT: Dating maintenance tags: {{Merge}}2025-03-01T11:18:57Z<p>Dating maintenance tags: {{Merge}}</p>
<p><b>New page</b></p><div>{{Short description|Type of data set organization}}<br />
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A '''relative record data set''' (RRDS) is a type of [[data set (IBM mainframe)|data set]] organization used by [[IBM]]'s [[VSAM]] computer data storage system.<ref name="demystified">{{cite book|url=https://www.redbooks.ibm.com/redbooks/pdfs/sg246105.pdf |series=Redbooks |title=VSAM Demystified |first1=Mary |last1=Lovelace |first2=Jose |last2=Dovidauskas |first3=Alvaro |last3=Salla |first4=Valeria |last4=Sokal |chapter=Chapter 1. VSAM basics |edition=3 |publisher=IBM |date=August 2022}}</ref>{{rp|5}} Records are accessed based on their ordinal position in the file (''relative record number'', RRN).<ref name="demystified"/>{{rp|29}} For example, the desired record to be accessed might be the 42nd record in the file out of 999 total.<br />
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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.{{huh|date=April 2021}}<br />
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==Structure==<br />
An RRDS consists of data records in sequence, with the record number indicating the record's logical position in the data set.<ref name="demystified"/>{{rp|29}} A program can access records randomly using this positional number or access records sequentially.<ref name="demystified"/>{{rp|30}} But unlike a [[Key Sequenced Data Set]], an RRDS has no keys, so the program cannot access records by key value.<br />
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==See also==<br />
*[[Key-sequenced data set]]<br />
*[[Entry-sequenced data set]]<br />
*[[Linear data set]]<br />
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==References==<br />
*https://web.archive.org/web/20051013071230/http://www.jaymoseley.com/hercules/vstutor/vstutor.htm<br />
*http://www.mvsforums.com/techfaqsvsam.html<br />
*https://web.archive.org/web/20070311021954/http://www.redbooks.ibm.com/redbooks/SG246105/wwhelp/wwhimpl/js/html/wwhelp.htm<br />
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[[Category:Computer file systems]]<br />
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