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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. Explain the limitations of testing? Ans: Though testing is an significant part of system development and leads to a verified, valid and efficient system it as well faces s
program for full subtractor?
Question: (a) Differentiate between application software and system software. (b) Mr. Smith would like to know which type of computer is more appropriate to process the inf
Explain Spiral model The spiral model is separated into number of frame works. These frameworks are indicated by task regions. Usually there are six task regions. In spir
Describe Operational Testing? Ans) Testing done by the end user on software in its normal operating environment.
Explain the term- Phased In this approach only part of the new system is introduced and only when it proves to work satisfactorily is the next part introduced and so on, unti
Define cyclomatic complexity? Cyclomatic complexity defined as software metric which gives the quantitative measure of logical complexity of the program. The Cyclomatic comp
What kinds of bottlenecks can be expected in performance testing? Bottlenecks in performance testing can have below effects: - It can affect the performance and the scalabil
Discuss in details about Functional Modeling. This model describes the computations that take part within a system. This model is helpful when the conversion from the inp
When to Re-Engineer? When the system alter are mostly confined to part of the system then re-engineer that part. When hardware or software support becomes obsolete.
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