Database buffer requirements

You can use the VSPEC parameter of the IMS procedure to predefine buffer pool requirements for databases that use the OSAM or VSAM access method.

Use the VSPEC parameter to specify a two-character suffix for member DFSVSMxx in the IMS PROCLIB data set. This member predefines the buffer pool requirements for databases that use OSAM or VSAM as the access method. The IMS procedure generates a default value of 00 that points to a general- purpose buffer definition in member, but you can change this suffix.

See IMS buffer pools to specify subpool sizes.