Entry Sequenced Data Set

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An Entry Sequenced Data Set (ESDS) is a type of data set used by the VSAM computer data storage system. 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. ESDS is therefore very time consuming, and hence there was a need for other type of records access.

[edit] See also

• Key Sequenced Data Set
• Relative Record Data Set
• Random access

[edit] References

• http://www.auditmypc.com/acronym/ESDS.asp
• http://www.jaymoseley.com/hercules/vstutor/vstutor.htm
• http://www.mvsforums.com/techfaqsvsam.html