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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.
Discuss in details the design steps in transaction mapping. Re-Check the fundamental model. Re-check and refine the DFD for the software. Determine the DFD has either
Explain Hybrid Testing? Ans) A mixture of top-down testing combined with bottom-up testing of prioritized or available components.
Different characteristics of software measures Different characteristics of software measures identified by Basili (1989) are given below: • Objects of measurement: They i
Static testing and dynamic testing Static testing is checking the application without actually running the application while dynamic testing checks the application by running i
vi curve
A group process that takes large quantity of language data, like as a list developed by brainstorming, and separates it into categories.
Scenario A scenario is a sequence of events that happen in a particular implementation of the system. A scenario can be defined textually by enumerating the sequence of events
Sanity testing : - Sanity testing is used to make sure that multiple or conflicting functions or variables do not exist in the system. - It verifies that the components of th
A measure of the severity and probability of undesired effects. Often taken as the easy product of probability and consequence.
What is VDD Ans) VDD- "version description document".
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