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CA IDMS - 19.0
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Native VSAM Considerations

Last update August 7, 2015

An overview of batch compilation and the JCL/commands you need to execute non-SQL schema and subschema statements under the central version or in local mode are discussed in this section.

You can structure a native VSAM data set as a key-sequenced data set (KSDS), an entry-sequenced data set (ESDS), or a relative record data set (RRDS). The following table lists the characteristics of each data set structure.

Native VSAM Data Set Structures

VSAM Structure 1 Access method Record Format  
KSDS
1 KSDS = key-sequenced data set 
Prime index
Alternate indexes
Fixed or variable Spanned or nonspanned

ESDS
ESDS = entry-sequenced data set

Relative byte address (RBA)
Alternate indexes
Fixed or variable Spanned or nonspanned

RRDS
RRDS = relative record data set

Relative record number Fixed Nonspanned

For more information, see the following topics:


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