Data spaces

Data spaces are used by IMS Database Recovery Facility and IMS High Performance Image Copy to hold data that is being processed or to pass data between multiple address spaces. Tool-specific keywords are used to control the use of the data spaces.

Your environment can restrict the use of data spaces. If your site restricts which tools can create and use data spaces, you need to authorize the following programs to allow the tools to function properly.

The following information pertains to the tools that use data spaces and the parameters that you can use to control their use.

IMS Database Recovery Facility

IMS Database Recovery Facility uses data spaces for spilling change accumulation and log records when there is not enough memory to hold the records.

The following programs need to be authorized for creating data spaces:

FRXSDR00

IMS Database Recovery Facility main program

FRXSDR10

IMS Database Recovery Facility Index Builder or DFSPREC0 address space program

You can control the size of each data space that is created by using the SPSIZE keyword. For more information about the use of this keyword, see the IMS Recovery Solution Pack: IMS Database Recovery Facility User's Guide.

IMS High Performance Image Copy

IMS High Performance Image Copy uses data spaces to share control data among address spaces. The amount of space used is 128 KB plus an additional 8 KB for each DBDS being processed.

The following program needs to be authorized for creating data spaces:

FABJMAIN

IMS High Performance Image Copy main program