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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 are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
case study
Construct a clean ans concise ER diagram for the database indicating the cardinality mapping for Employee management syatem
Normalization :It is a process of examine the given relation schemas based on their primary key and Functional Dependencies (FDs) to achieve the properties Minimizing redun
What is the archtetype/instance pattern? The archetype/instance pattern happens when one entity tracks occurrences of another entity. A common example is the relationship among
By using the delete operation some consisting records can be deleted from a relation. To delete some definite records from the database a condition is also specified based on which
Consider the following relational scheme: R (a,b,c,d,e,f) and its corresponding set of FDs {d→ a, be → c, ac → e, b → f, f → d, a → c}. a. Is the following decomposition i) non
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
Illustrate the class diagram for class room scheduling system If in any college, the number of classrooms are limited which have to be allocated to various classes and instruct
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