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Explain data abstraction?
Data abstraction Data abstraction is a methodology in which enables us to isolate how a compound data object is utilized from the details of how it is constructed from more primitive data objects.
What are referential integrity constraints? A value that appears in single relation for a given set of attributes also appears for a particular set of attributes in another rel
Control as Concurrent Tasks The expression control as simultaneous task means applying control for those events of object which can happen simultaneously. An object can be imp
What are metrics for choosing the best algorithm? Matrices for choosing the best algorithms are as below: Computational complexity Ease of understand ability and im
a) Suppose we updated the catalog tables in real time, that is, after every update, insert, or delete SQL statement were executed-rather than only running RUNSTATS once every few
What is called a query evaluation plan? A sequence of primitive operations that can be used to assess a query is a query evaluation plan or a query implementation plan.
Explain nested relations? Nested relations The assumption of INF is a natural one in the bank examples we have considered. However, not all applications are best modelled
give some example real life situation where DBMS are most suitable
State as Location within a Program In this traditional approach, location of control inside a program totally defines the program state. Any finite state machine may be implem
The need for three level architecture The aim of the three level architecture is to divide each user's view of the database from the way the database is physically shown.
Describe analysis of access paths To describe analysis of access paths, consider an example of the design of a company's employee skills database. A part of the object model fr
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