Creating and using data spaces

A data space is an area of virtual storage that a program can ask the system to create. Its size can range from 4K bytes to 2 gigabytes, according to the program's request. Unlike an address space, a data space contains only user data. Program code cannot run in a data space.

The DSPSERV macro manages data spaces. The TYPE=BASIC parameter (the default) tells the system that it is to manage a data space rather than a hiperspace. Use DSPSERV to:

Create a data space
Release an area in a data space
Delete a data space
Expand the amount of storage in a data space currently available to a program
Load an area of a data space into central storage
Page an area of a data space out of central storage

Before it describes how your program can perform these actions, this chapter describes how your program will reference data in the data space it creates.