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Question:
(a) List four disadvantages of the File Processing System as compared to the Database Systems.
(b) The integrity of a database is enforced by integrity rules. One of these rules, the referential integrity rules, states that the database must not contain any unmatched foreign key values.
(i) Discuss what should happen on an attempt to delete the target of a foreign key reference?
(ii) Discuss what should happen on an attempt to update the primary key of the target of a foreign key reference?
Your discussion should describe the three possible techniques which can be used to deal with the problem, and provide one example for each technique.
(c) List and describe briefly the nine components of a typical database environment.
(d) Explain the difference between external, internal and conceptual schemas. How are these different schema layers related to the concept of logical and physical data independence?
Draw the precedence graph of the following schedule and determine whether the schedule is serializable. (Note that all instructions, except lock and unlock, are omitted. We assume
It defines that no primary key value can be null. This is as the primary key is used to recognize individual tuple in the relation. So we will not be able to recognize the records
entity relationship diagram for online examination system
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
Define DBA database administrator? DBA : A database administrator (DBA) is a person who is responsible for the environmental aspects of a database. In common, these involves:
Construct an ER diagram for a hospital along with a set of patients and a set of medical doctors Associate with every patient a log of the several tests and examinations conducted.
The clause in SQL which specifies that the query result should be sorted in ascending or descending order based upon the values of one or much more columns is Ans : Order by
(a) Explain briefly the three parts of a relational Model. (b) Contrast the following terms with an appropriate example: (i) stored attribute v/s derived attribute (ii) en
NEED ER DIAGRAM WITH MINIMUM ENTITY AND RELATIONSHIP of Hospital Management System
Mention the several levels in security measures. A) Database system B) Operating system C) Network D) Physical Human
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