The Change Monitor runs with a driver task under CV, or as a subtask of the operating system in local mode operation. For CV, the task definition and programs for the driver are provided on the CA Endevor/DB installation media (in dictionary member CA-ENDEVOR-DB-SYSGEN). Once the installation procedure shipped with the media is executed, the Change Monitor and driver are available to any dictionary which has been "hooked" through the IDMSNWKA-to-NDVRNWKA mapping. Any number of dictionary/CCDB pairs can be run through the monitor.
During execution, the Change Monitor automatically attaches a driver task (named NDVRSERV under CV) when it is first invoked. The driver task opens one protected update run unit (on demand) for each CCDB under its control. While this run unit is active, NDVRSERV has exclusive control of the CCDB. This run unit remains active throughout the day and is responsible for all updates performed against the CCDB.
Figure 1.2 depicts the run time architecture of the CA Endevor/DB system.
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