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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.
The physical location of a record is determined by which mathematical formula that transforms a file key into a record location? The physical location of a record is determined
Give an example of Operations from the functions of a bank. For creation of a saving account, you can write: bank::: create -savings-account (customer)->account. For oper
What is the role of a database administrator?
External failure : A failure can also result because of an external cause, such as earthquakes, fire, floods, etc. The database must be duly backed up to avoid troubles occurring d
Northwind Pty Ltd sells a variety of food products throughout the world. They want to use the reporting features of SAP''s Business Information Warehouse to better understand thei
Question: This form represents one of a number used for each sailing of a range of boats. A passenger may go on many sailings and will have the same passenger number for each.
Difference between Operating System and Database Security Security within the operating system can be executed at various levels ranging from passwords for access to system, t
Example : Create a sequence named SEQSS that starts at 105, has a step of 1 and can take maximum value as 2000. CREATE SEQUENCE SEQSS START WITH 105 INCREMENT BY 1 MAX VA
Relational Algebra is a set of basic operations used to influence the data in relational model. These operations allow the user to specify basic retrieval request. The result of re
as a customer service employee explain five measures you would recommend to make even a displeased students patronize the school canteen
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