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Explain ER Relationship model?
An entity-relationship model (ERM): An entity-relationship model (ERM) is an abstract theoretical illustration of structured data. Entity-relationship modelling is a relational schema database modelling techniques, used in software engineering to produce a kind of conceptual data model (or semantic data model) of a system, frequent a relational database, and its needs in a top-down fashion. Diagrams created using this procedure are known as entity-relationship diagrams, or ER diagrams or ERDs for short.
Creating views with check option : This option limits those updates of data values that cause records to go off the view. The following instance tells this in more detail: Examp
Define the concept of Object Diagram An object diagram shows a set of the objects and their relationships with each other at a point of time. In a static view, object diagram
Consider the relation PERSON. If you want to display details of persons having age less than or equal to 30 than the select operation will be used as follows: σ AGE The resu
Types of Data fragmentation
How external/conceptual mapping and conceptual /internal mapping is performed
Replicating Data One approach that may support efficient access to dissimilar applications as above may be to give access to every of the applications from dissimilar replicate
project on dbms
Normal 0 false false false EN-US X-NONE X-NONE
Update Operations and Dealing with Constraint Violations There are three basic operations to be executes on relations: Insertion Deletion Update The INSER
Control Files : The redo and control files logs support the rest of the architecture. Every database must have at least one control file, although you have more than one to guard
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