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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.
Define Deadlock prevention These protocols make sure that the system will never enter a deadlock state. There are two methods to deadlock prevention. One approach makes sure t
What is meant by heuristic optimisation? Discuss the main heuristics that are applied during query optimisation. Ans: In heuristic optimization, heuristics are employed to r
Explain weak and strong entity type ? Weak and Strong entity type: An entity set which does not have a primary key is referred to as a weak entity set. The existence of a wea
Write short notes on relational model The relational model uses a collection of tables to show both data and the relationships between those data. The relational mo
What is known as clustering file organization? In the clustering file organization, records of several dissimilar relations are stored in the similar file.
Funky Festivals Specification Funky Festivals organise music festivals which take place at various venues throughout the UK. A venue needs to be booked before a Festival can t
A student entity type has the following attributes,name..
Question: AirwaysCentre, an international airline booking company currently uses a relational database system for their operations, which includes the following relations: P
..
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
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