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(a) Explain the three types of potential mistake which could occur if concurrency control is not properly enforced in the database system. Support your answer with appropriate example for each.
(b) Explain the data access protocol based on the compatibility matrix.
(c) Describe "deadlock" and give an example.
(d) Describe how a deadlock state can be detected and how the system can break such a state.
why three level architecture had been developed/
Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
One-to-many : An entity in A is related with any number of entities in B. An entity in B is related with at the most one entity in A. Example: Relationship between faculty and d
Discuss the types of integrity constraints in which must be checked for the update operations - Insert and Delete. Give examples. Insert operation can violet any of the subse
how to make an e r diagram?
What are the basic objects of the data dictionary? Tables Domains Data elements Structures Foreign Keys
What is NULL? Simply NULL means not in value.
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
When It is better to use files than a DBMS? It is better to use files than a DBMS when Multiple users wish to access the data.
What is a view? Make a view of EMP table named DEPT 20, to display the employees in department 20 and their annual salary. Ans: View is a virtual table that does not consist
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