System Efficiency

CA 1 has the following system efficiency features:

CA 1 operates in a true, real-time processing mode, as an extension of your operating system. Resource requirements are nominal for these functions.
The TMC and Audit data sets are accessed by Execute Channel Program (EXCP) processing. Records are always read directly based on a one-to-one correspondence of relative record to volume serial number (or in the case of the Audit, an internal counter). No extraneous reads to find the proper records are required. No storage is required for BDAM or other operating system access method modules.
The TMC is read a full track or cylinder at a time to expedite processing for reports and utilities.
The Audit data set is a wraparound data set and, as a result, the TMC backup process does not require that tape mounts or TMC and Audit recording stop while the backup is running.
The Audit threshold notifies operations when the Audit data set is approaching capacity. There is never a need to stop operations because the Audit data set is full, nor is a TMC record update ever lost because the Audit is full.
The real-time processing programs used by CA 1 are modular and function-oriented to provide the capabilities necessary with a minimum number of instructions executed and a minimum number of modules loaded into storage.