Your program needs to release storage when it used a data space for one purpose and wants to reuse it for another purpose, or when your program is finished using the area. To release the virtual storage of a data space, use the DSPSERV RELEASE macro. (Data space release is similar to PGSER RELEASE for an address space.) Specify the STOKEN to identify the data space and the START and BLOCKS parameters to identify the beginning and the length of the area you need to release.
Releasing storage in a data space requires that a problem state program with PSW key 8 - F be the owner or creator of the data space and have the PSW key that matches the storage key of the data space.