Permanently allocated attribute
The permanently allocated attribute prevents the system from automatically deallocating a particular data set or z/OS® UNIX file to meet the control limit. The effect of this attribute is to determine eligibility for automatic deallocation.
The permanently allocated attribute is assigned automatically to data sets or z/OS UNIX files allocated through JCL and the TSO/E ALLOCATE command. In addition, you can request (through the DYNALLOC macro parameter list) that a data set be assigned this attribute when you dynamically allocate the data set.
Note: Because permanently allocated resources are not automatically
deallocated, and all resources allocated through the TSO/E ALLOCATE
command and JCL are permanently allocated, the control limit is the
primary factor that controls the number of resources that a TSO/E
user can have allocated at the same time. For information on setting
a control limit, see Control limit.