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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.
What does Data abstraction contains? A Data abstraction is a named collection of data that describes a data object Eg: door Attributes: door type, Opening mechanism, Swing d
RE-ENGINEERING:- It is re-organizing and changing existing system to make them more maintainable. It includes:- Source code translation. Program structure development
What are functional and non-functional requirements?
Q. How to build the Structure Chart? Building the Structure Chart Processes in the DFD are liable to represent one module on the structure chart Efferent processes
What are command buttons? How to use command buttons? Command buttons are defines to as controls. The control is capable of implementing a set of instruction when the user clic
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
Write short notes on estimation models. Empirical estimation models can be used to complement decomposition techniques and present a potentially important approach in their own
What is quality? Quality, simplistically, means that a product should meet its requirement. This is problematical for software systems. There is a tension among custom
When must you stop testing? It is very difficult to determine as many modern software applications are complex and run in such an interdependent environment that complete testi
compare and contrast the advantages of verticle and horizontal structural partitioning?
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