DBMS/ C6160D Relational databasesThe features of the Entity-Relationship model are examined, as a means for representing both the conceptual schema and the external schema in a database system. In order to serve in this dual capacity, its modelling features are extended to support multiple user...
database management system (DBMS) See database manager. database manager A program that manages data by providing centralized control, data independence, and complex physical structures for efficient access, integrity, recovery, concurrency control, privacy, and security. database request module (DBRM)...
This new data-induced predicate (diP) is a necessary condition of the actual predicate (i.e., σ ⇒ d) because there may be false- positives; i.e., in the partitions that are included in the diP, not all of the rows may satisfy σ. However, the diP can apply over the joining ...