Database Monitoring || Monitors in Databases

what is about Database Monitoring or Monitors in Databases. why database monitoring. The monitor is the unit of a DBMS responsible for the structural integrity of the database. A monitor can check values being entered to ensure their consistency with the rest of the database or with characteristics of the particular field. For example, a monitor might reject alphabetic characters for a numeric field. Three types of database monitoring - Range Comparisons, State Constraints and Transition Constraints.