Native VSAM Considerations

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.
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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