Virtual Storage Access Method Assignment Help

Online Virtual Storage Access Method Assignment Help

VSAM or Virtual Storage Access Method is highly used in IBM mainframes and it is the expanded version of ISAM (indexed sequential access method) that was the file access technique which was earlier used by IBM. The scope of this subject compels students to take up its study and so, when students require the best Virtual Storage Access Method assignment help, get in touch with the writers of BookMyEssay.

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What is Meant by Virtual Storage Access Method?

Virtual Storage Access Method or VSAM is recognized as a high-performance access technique and data set organization that organizes and maintains data through a catalog structure.

What is VSAM used for?

Commonly, VSAM is used for applications and it isn’t used for JCL, source programs, or executable modules. Again, VSAM files can’t be displayed or modified with ISPF routinely.

It is easy to use VSAM for organizing records into three kinds of data sets, like entry-sequenced, key-sequenced, and relative record. The chief difference amongst these kinds of data set is considered the methods in which their records are stored and retrieved.

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Kinds of VSAM Data Sets

The three kinds of VSAM data sets are as follows:

• ESDS or Entry-sequenced data set – Here, the record sequence gets determined through the order in which the records are put in the data set. An ESCS is ideal for applications which don’t need any specific sequencing of the data or for those which need time-ordered data. Applications that make use of a journal or log are appropriate for this data set structure.
• KSDS or Key-sequenced data set – This record sequence gets determined through a key that contains an exclusive value, like an invoice, an employee, or transaction number. The key is considered the contiguous part of the record and it gets defined when the data set is formed. This data set is the most flexible approach for the majority of the applications as the record can be directly accessed through the key field.
• RRDS or Relative-record data set – This data set is considered a string of fixed-length slots and each of them is recognized with the help of an RRN (relative-record number). Every slot can be empty or contain a record too. Records are kept and retrieved through the relative-record number. This data set is ideal for many apps through the use of fixed-length records.

The Access Methods of VSAM

Access methods are viewed as software routines which control the transfer of data between primary storage and secondary storage devices. The auxiliary or secondary storage is autonomous of the computer memory, like storage on disk or tape.

VSAM is particularly designed for use with disks and as VSAM data set structure allows the use of direct and sequential access types, a user can select any of the types or at times, the combination of access types which suits his particular application requirements.

By direct access means you have the capability to read any data record directly minus reading previous records that are in the data set. On the other hand, sequential access means you retrieve a sequence of records and sequence has a distinct meaning for every VSAM data set organization.

Again, by skip sequential access is meant a person can use a combination of sequential and direct access.

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Characteristics of VSAM

The characteristics of VSAM are mentioned below:

• VSAM proposes fast access to a dataset.
• VSAM shields data against illegal access through the use of passwords.
• VSAM has got choices to optimize performance.
• VSAM happens to be more organized and structured in storing data.
• VSAM permits data set sharing in an online and batch environment.

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