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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.
Write about software change strategies. The software change methods that could be applied separately or together are: Software maintenance - The alters are made in the software
Question 1 . What are the drawbacks of RAD Model Question 2 . Explain why reliability is more important than efficiency? Question 3 . What are the activities of funct
What is Process improvement? Understanding existing processes and introducing process changes to improve product quality, decrease costs or accelerate schedules. Most proces
Iterative waterfall model The iterative waterfall model is as shown in the following figure. Requirement gathering phase in which all needs are identified. The design
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
State about the Data Dictionary This is another tool of requirement analysis that reduces complexity of DFD. A data dictionary is a catalog of all components of a system. DFD
What are the general activities in design process? i. System structuring - The system is separated into principle subsystems components and communications among these subsystem
Question : (a) What are the main characteristics of an ERP system? List the benefits and disadvantages of implementing an ERP system at Hawkins Cookers Ltd. (b) Explain the
Define the Design phase of SDLC In this stage, a logical system is built which fulfils given requirements. Design phase of software development deals with transforming custome
Go to Blackboard, and print the project scenariolocated under the Project folder. Using Visio, draw a Physical DFD ofall three business processes described in theproject scenario.
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