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The External or View Level
The external or view level is the highest level of abstraction of database. It gives a window on the conceptual view, which permits the user to see only the data of interest to them. The user can be either an end user or an application program. There can be a lot of external views as any number of external schemas can be defined and they can overlap each other. It contains of the definition of logical records and relationships in the external view. It also has the methods for deriving the objects such as attributes, entities and relationships in the external view from the Conceptual view.
Logical DBMS Architecture
The Update Operations : Update operations are used for altering database values. The constraint violations faced by this operation are logically the similar as the problem faced
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 pictori
FDs in Entities : Student entity : Enrolment number → Student name, Address Course Entity :
What are the DBMS languages? Briefly explain? Data Definition language (DDL):A database schema is specified through a set of definitions expressed through a special language
milestone assignment
The Database Approach In order to overcome the limits of a file system, a new approach was needed. Hence a database approach emerged. A database is a persistent collection of
Write an sql statement to find what is the percentage of home policies which are from the state of Arizona out of all Home policies by Policy Value.
Need a sample of a clinic database relationships
What are two special events? The two special events are as "entry" and "exit". Any action which is marked as linked to entry event is executed whenever given state is entered v
What is system log? What are the entries? Ans: The system log that is generally written on stable storage contains the redundant data required to recover from volatile
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