Entry Sequenced Data Set
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Revision as of 10:43, 15 June 2021 by imported>Steve Marsio (over-write)
An entry-sequenced data set (ESDS) is a type of data set used by IBM's VSAM computer data storage system.[1]:5 Records are accessed based on their sequential order, that is, the order in which they were written to the file; which means that accessing a particular record involves searching all the records sequentially until it is located, or by using a relative physical address (Relative byte address, RBA), i.e. the number of bytes from the beginning of the file to start reading.[1]:28
Keys may be used to access records in an ESDS by defining an alternate index.[1]:15
See also
References
"MVS Forums - Technical FAQ's - VSAM". http://www.mvsforums.com/techfaqsvsam.html. Retrieved 12 December 2017.
- ↑ 1.0 1.1 1.2 Lovelace, Mary; Dovidauskas, Jose; Salla, Alvaro; Sokal, Valeria (March 2013). "Chapter 1. VSAM basics". VSAM Demystified. Redbooks (3 ed.). IBM. http://www.redbooks.ibm.com/pubs/pdfs/redbooks/sg246105.pdf.
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