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VSAM or Virtual Storage Access Method is a file storage access process that IBM mainframes use. VSAM is considered an expanded variation of ISAM (indexed sequential access method) that was the file procedure that IBM used previously.

CICS in Mainframes and COBOL use it for storing as well as retrieving data. Virtual Storage Access Method turns it smoother for an application program to execute input and output operations.

The Kinds of Data Sets in VSAM

VSAM comprises four kinds of data sets and they are:

KSDS or Key-sequenced data set – In KSDS, the record series gets determined by a key comprising a unique value, like an invoice, employee, or transaction number. The EBCDIC collating sequence defines the record number. A KSDS is defined with a prime index and it relates the key value of the record to its related location in the data set. To locate a record to retrieve as well as locate a collating position to insert a record, VSAM utilizes the index. A KSDS is acknowledged as the most flexible approach for the majority of applications as people can access the record directly through the key field.

RRDS or Relative-Record Data Set – In RRDS, the data set happens to be a chord of some fixed-length slots, and each is recognized by an RRN or Relative-Record Number. Every slot can either be empty or comprise a record. Records are preserved as well as retrieved with the help of the RRN of the slot. A Relative-Record Data Set is ideal for several applications that use fixed-length records.

ESDS or Entry-Sequenced Data Set – In ESDS, the record string gets determined by the arrangement in which a record is put into the data set. An ESDS is ideal for applications that don’t need any specific arrangement of data. It is ideal for those that need time-ordered data. An application that utilizes a journal or log is ideal for an Entry-Sequenced Data Set structure.

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The Usefulness of VSAM

VSAM does enable the organization of records in either logical or physical sequences. You can also index files by a record number. VSAM aids enterprises by proposing fast access to data through the utilization of the inverted index. In VSAM, the records can be fixed or of variable length.

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