Overview of the registry

The registry is a data space that is backed by a VSAM linear data set (VLDS). The TOM registry contains all object definition information, provides quick access to the information, and maintains the information across system restarts. Every TOM PAS that is running within the same sysplex needs to be constantly updated about the status of all objects in the TOMPLEX. Therefore, every modification to the information in the registry is communicated across the sysplex by way of XCF messages.