1.5. VSAM terminology and concepts

Before we discuss VSAM in detail, we need to review some VSAM concepts implemented by VSAM constructs. These concepts will be used throughout the book. We are going to start with the smallest VSAM entity, the logical record, to the largest VSAM entity, the sphere. After that we cover splits, buffering, control blocks and other constructs.

1.5.1. Logical record

A logical record is a unit of information used to store data in a VSAM data set. It is made up of a set of bytes containing a logical description of an item processed by an application program. This item can be a customer with all his or her information, or an employee with all associated data (name, serial number, department).

The logical record is ...

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