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QUESTION - Fault Tolerance
(a) Three computers together provide a replicated service. The manufacturers claim that each computer has a mean time between failure of five days; a failure typically takes four hours to fix. What is the availability of the replicated service?
(b) In the gossip architecture, why does a replica manager need to keep both a ‘replica' timestamp and a ‘value' timestamp?
(c) Explain the difference between linearizability and sequential consistency, and why the latter is more practical to implement, in general.
(d) Explain why allowing backups to process read operations leads to sequentially consistent rather than linearizable executions in a passive replication system.
Q. Disadvantage of lines of code? 1. Lack of Accountability: Lines of code measure suffers from some fundamental problems. A few think it isn't useful to measure the productivi
What is equivalence partitioning? Equivalence partitioning is a black box method that separates the input domain into classes of data. From this data test cases can be derived.
Common coupling: Common coupling is when two modules share the similar global data (e.g. a global variable). Changing the shared resource implies changing all the modules using it
Advantage of software package: Advantages accrue from this situation. Some of these are mentioned below: i) An efficient software package requires at least 4 to 5 man yea
How the CASE tools are classified? CASE tools can be classified by A. By function or use B. By user type(e.g. manager,tester),or C. By stage in software engineering pr
Define the Stress testing: - It checks the robustness of application. - It verifies that application consistently gives satisfactory performance under unfavorable and extrem
What is a cohesive module? A cohesive module performs only "one task" in software process with little interaction with other modules. In other words cohesive module performs on
Determine the problems of software maintenance Software maintenance has the below problems: i) It is very cumbersome to analyse and understand code written by somebody.
What is CMMI assessment? Examines the processes used in an organisation and assesses their maturity in every process area. Based on a 6-point scale: Not performed;
Problem 1. Explain why it is necessary to design the system architecture before the specifications are written 2. Explain why it is important to describe software designs 3.
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