1.12. Processing a VSAM cluster

Before we cover how to process a VSAM cluster it is recommended that you have an idea about the source of VSAM processing options. Refer to “Major sources of VSAM processing options” on page 233.

To process a VSAM cluster the following actions must be executed:

  • Allocate the data set to establish the logical link between a program and a data

  • Open the data set, identifying it with a DDNAME.

  • Accessing data through GETs and PUTs using an access method.

  • Close the data set.

  • Unallocate the data set.

Following is a brief discussion of the VSAM processing actions.

1.12.1. Allocating a VSAM cluster

First, we want to differentiate between data set allocation and data set creation. The expression allocate a data set does not ...

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