Location Mode Options

The location mode options for an RRDS are described below:

VIA (the indexed set) stores records in control field sequence. This option is recommended.
CALC (on control field) stores records by using a randomizing algorithm on the control field. This option may be used for direct retrieval.
VIA (other set) stores records in physical key sequence near their owner records. This option may be used if the majority of processing occurs through CA IDMS/DB programs that access the data through the specified set. VIA (other set) is not recommended if access is primarily through CA IDMS VSAM Transparency.
CALC (on other field) stores records by using a randomizing algorithm on a field other than the prime-key field. This option may be used if the majority of processing is through CA IDMS/DB programs that access the data through the specified key field. It is not recommended if access is primarily through CA IDMS VSAM Transparency.
DIRECT stores records on or near a user-specified database page. This option may be used if the majority of processing occurs through CA IDMS/DB programs that access the data directly, by using the database key. It is not recommended if access is primarily through CA IDMS VSAM Transparency.