Requesting SB with an SB Initialization exit routine

An SB exit routine allows you to dynamically control the use of SB at application scheduling time.

You can use an SB Initialization exit routine to:

• Request conditional activation of SB for all or some batch and BMP programs
• Allow or disallow the use of SB
• Change the default number of buffer sets

You can do this by writing your own SB exit routine or by selecting a sample SB exit routine and copying it under the name DFSSBUX0 into IMS.SDFSRESL.

IMS supplies five sample SB exit routines in IMS.SDFSSRC and IMS.SDFSRESL. Three of the sample routines request SB for various subsets of application programs and utilities. One sample routine requests SB during certain times of the day and another routine disallows use of SB. You can use these sample routines as written or modify them to fit your needs.

Detailed instructions for the SB Initialization Exit Routine are in IMS Version 15.4 Exit Routines.