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VSAM cluster is defined in JCL. JCL uses IDCAMS utility to create a cluster. IDCAMS is a utility, developed by IBM, for access method services. It is used to primarily define VSAM datasets.
Defining a Cluster
The following syntax shows the main parameters which are grouped under Define Cluster, Data and Index.
Parameters at the CLUSTER level apply to the entire cluster. Parameters at the DATA or INDEX level apply only to the data or index component.
We will discuss each parameter in detail in the following table −
Example
Following is a basic example to show how to define a cluster in JCL −
If you will execute the above JCL on Mainframes server. It should execute with MAXCC = 0 and it will create MY.VSAM.KSDSFILE VSAM file.
Deleting a Cluster
To delete a VSAM file, the VSAM cluster needs to be deleted using IDCAMS utility. DELETE command removes the entry of the VSAM cluster from the catalog and optionally removes the file, thereby freeing up the space occupied by the object. If the VSAM data set is not expired then it will not be deleted. To delete such types of datasets use PURGE option.
Above syntax shows the parameters which we can use with Delete statement. We will discuss each of them in detail in following table −
Example
Following is a basic example to show how to delete a cluster in JCL −
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If you will execute the above JCL on Mainframes server. It should execute with MAXCC = 0 and it will delete MY.VSAM.KSDSFILE VSAM file.
VSAM stands for Virtual Storage Access Method. VSAM is a file storage access method used in MVS, ZOS and OS/390 operating systems. It was introduced by IBM in 1970's. It is a high performance access method used to organize data in form of files in Mainframes. VSAM is used by COBOL and CICS in Mainframes to store and retrieve data. VSAM makes it easier for application programs to execute an input-output operation.
This tutorial is designed for software programmers with a need to understand the VSAM concepts starting from scratch. This tutorial will give you enough understanding on VSAM from where you can take yourself to higher level of expertise.
Before proceeding with this tutorial, you should have a basic understanding of JCL and COBOL. A basic understanding of any of the file handling method will help you in understanding the VSAM concepts and move fast on the learning track.
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