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Write short note on Events
Events consist of inputs, interrupts, decisions and actions performed by any external device or users. Every event always has a sender and receiver. In most of cases sender and receives are same object. A state with no a predecessor and successor are ambiguous and care would be taken to represent initiations and termination of the events. Events that have same effect on control flow must be grouped together even if value differs. The events are to be allocated to object classes that send or receive it.
Most of design issues of systems are concerned with steady-state behaviour of system.
However, system design phase must also address the initiation and finalization of system. This is addressed by a set of new uses cases known as administration use cases
What is relational model feature? A relational model feature is much more data independence than some other database models.
Modify a sequence: ALTER SEQUENCE SEQSS INCREMENT 2 MAXVALUE 3000; Removing a sequence: DROP SEQUENCE SEQSS;
Can a filed occur in several field groups. Yes. But it leads to redundant data redundancy.
what problems are raised by the database? why is it so controversial? why is data quality an issue?
1) Define a job scheduling strategy that will meet business requirement of reporting availability by 6am CST for the following cubes? Show the job scheduling dependencies in a pict
Draw an ER diagram that shows the organization of a simple student database. The database captures the information about letter grades obtained by university students who enrolled
What is Candidate Key Super Key or Candidate Key: It is such an attribute of a table that can uniquely recognize a row in a table. Generally they have unique values and can n
A distributed database is defined as "a collection of multiple logically interrelated database which are physically distributed over a computer network" (a) Give any three advan
A relation has: Relational Schema Relation instance Relational Schema: A relational schema shows the relation's name, its attributes and the domain of every a
Describe integrity and security? a) Domain constraint b) Referential integrity A value that appears in one relation for a given set of attributes also appear fo
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