OSAM options

Two types of options are available for databases using OSAM.

Two types of options are:

1. Options specified in the DBD (free space, logical record size, CI size).

   These options are covered in other topics in this section.

2. Options specified in the OPTIONS control statement when IMS is initialized.

   In a batch system, the options are put in the data set with the DDNAME DFSVSAMP. In an online system, they are put in the IMS.PROCLIB data set with the member name DFSVSMnn. Your choice of OSAM options can affect performance, recovery, and the use of space in the database.

   The OPTIONS statement is described in detail in IMS Version 15 System Definition. The statement and all its parameters are optional.