A relational database system needs to maintain data about the relations, such as the schema of the relations. This is called

Related MCQs

• Relational schemas and other metadata about relations are stored in a structure called the ____________
• ER diagram is a ________of the database system which provides high level conceptual data model and supports the users perception of the data.
• In system modeling : A-Classification model; B-Stimulus-response model; C-Data processing model: 1-Here data-flow diagram show how data is processed at different stages; 2-Here object class/inheritance diagram show, how entities have the common characteristics; 3-Here state transition diagram shows the how the system reader to internal and external events
• __________ is a graphic representation of system that shows data flows to from and within system, processing functions that change the data in some manner and storage of tis data.
• Match the following : A- Maintenance control: B-Maintenance measures: C-Maintenance personnel : 1-Cost of planning and scheduling hardware preventive main- tenance, and software maintenance and upgrades, managing the hardware and software baselines, and providing response for hardware corrective maintenance. 2- Measures that address how easily a system can be repaired or changed. 3-Number of personnel needed to maintain all aspects of a computer system, including the support personnel and facilities needed to support that activity.
• In system modeling : A-Model; B-Prototype;; 1- it’s an abstract view of a system that ignores system details; 2-It’s an initial version of system software which givers end-users a concrete impression of the system capacities
• Extracting data items and objects, to get information on data flow, and to understand the existing data structures that have been implemented is sometimes called
• In system modeling: A-Architectural model: B-Stimulus-response model: C-Behavioral models: 1-Used to describe the overall behavior of the system: 2-State transition diagram show how the system reacts to internal and external events: 3-Shows principal sub-systems which makes the system
• Which of the following steps may not be used to define the existing data model as a precursor to re-engineering a new database model:
• Truthfulness with which software satisfies differing system constraints and user needs is