In a DASD-only log stream, interim storage for log data is in the local storage buffers on the system. Local storage buffers are data space areas associated with the system logger address space. Many computer resources are so critical to a company's work that the integrity of these resources must be guaranteed. If changes to the data in the resources are corrupted by a hardware or software failure, human error, or a catastrophe, the computer must be able to restore the data. These critical resources are called protected resources or, sometimes, recoverable resources.
Resource recovery is the protection of the resources.
Resource recovery consists of the protocols and program interfaces that allow an application program to make consistent changes to multiple protected resources. When a predefined event occurs, the exit manager gives control to an exit routine owned by a program interested in the event. In this exit routine, the program provides the processing for the event. The application program accesses protected resources and requests changes to the resources. The resource manager, through exit routines that get control in response to events, takes actions that commit or back out changes to a resource it manages.