Entry-sequenced data set
IBM data record organization type From Wikipedia, the free encyclopedia
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
 | It has been suggested that this article be merged with Linear data set, Key-sequenced data set and Relative record data set to Virtual Storage Access Method. (Discuss) Proposed since March 2025. |
 | This article includes a list of references, related reading, or external links, but its sources remain unclear because it lacks inline citations. (December 2017) |
Keys may be used to access records in an ESDS by defining an alternate index.[1]: 15
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