Optional functions specified in the Access Method Services DEFINE CLUSTER command

You can choose several optional functions that affect performance when you define your VSAM data sets.

These functions are specified in the Access Method Services DEFINE CLUSTER command. HALDB databases require that the REUSE parameter be specified on the DEFINE CLUSTER command. IMS Online Recovery Services takes advantage of the REUSE parameter, if it is specified.

Related Reading: This command and all its parameters are described in detail in z/OS® DFSMS Access Method Services for Catalogs.