Set Type

The set type specifies the organization of the set and identifies the key or keys, if any. The following five set organizations are available. For more information on the set organizations, refer to Structure Formats.

  • Bit vector

  • Index random (I-R)

  • Index sequential (I-S)

  • Ordered list (O-L)

  • Unordered list (LIST)

When no set organization is specified, one is assigned by default as shown in Default Set Organizations.

Table 11. Default Set Organizations

Set Type

Organization If Key Assigned

Organization If No Key Assigned

Disjoint set

Index sequential

Unordered list

Embedded set

Ordered list

Unordered list

All set and data set combinations are valid with the following exceptions:

  • Bit vector sets can refer only to disjoint standard data sets which do not contain variable-format records.

  • Index random and bit vector sets cannot be embedded.

  • No set can refer to an ordered data set.

  • Bit vectors cannot refer to sectioned data sets.

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