The Flat-File Alerter System

摘要

The flat-file alerter system allows one to monitor a flat file for various conditions of interest. A flat file is a sequential file of fixed-length records of identical format. In addition, the file is keyed on a specific field, and sorted on that key. Thus the addition of records (appearance of records with keys that did not exist before), deletion of records (disappearance of keys that existed before), and modification of records (modification of a field other than the key in a record) can be surveyed. (Author)