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Relative Record Data Set

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A Relative Record Data Set (RRDS) is a type of data set organization used by the VSAM computer data storage system. [1]

5 relations: Entry Sequenced Data Set, Key Sequenced Data Set, Random access, Sequential access, Virtual Storage Access Method.

Entry Sequenced Data Set

An Entry Sequenced Data Set (ESDS) is a type of data set used by the VSAM computer data storage system.

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Key Sequenced Data Set

A Key Sequenced Data Set (KSDS) is a type of data set used by the IBM VSAM computer data storage system.

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Random access

In computer science, random access (more precisely and more generally called direct access) is the ability to access any item of data from a population of addressable elements roughly as easily and efficiently as any other, no matter how many elements may be in the set.

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Sequential access

In computer science, sequential access means that a group of elements (such as data in a memory array or a disk file or on magnetic tape data storage) is accessed in a predetermined, ordered sequence.

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Virtual Storage Access Method

Virtual Storage Access Method (VSAM) is an IBM DASD file storage access method, first used in the OS/VS1, OS/VS2 Release 1 (SVS) and Release 2 (MVS) operating systems, later used throughout the Multiple Virtual Storage (MVS) architecture and now in z/OS.

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Redirects here:

R R D S, R. R. D. S., R.R.D.S., RRDS, Relative record number, Rrds.

References

[1] https://en.wikipedia.org/wiki/Relative_Record_Data_Set

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