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tilak · Beginner Joined: 13 Sep 2006 Posts: 9 Topics: 7

want the difference between base cluster and data component

base cluster is the name of vsam
what is data component? what it contain?

shekar123 · Posted: Wed Sep 20, 2006 7:54 am Post subject:

Tilak,

VSAM cluster contains two components Data Component and Index Component.

The data component is the part of a VSAM data set, alternate index, or catalog that contains the data records.

Using the index component, VSAM is able to randomly retrieve a record from the data component when a request is made for a record with a certain key. The key determines the record
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Shekar
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bablack · Posted: Mon Oct 16, 2006 1:21 pm Post subject:

What Shekar said is true for a KSDS (Keyed Sequential Data Set), but most other VSAM cluster types (e.g., ESDS-Entry Sequenced Data Set) have only a data component. An ESDS is essentially a VSAM sequential dataset.
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