Operating System Mcqs

Page No. 82

In the optimized technique for sequential access ___________ removes a page from the buffer as soon as the next page is requested.


awrite ahead


bread ahead


cfree-behind


dadd-front


View Answer free-behind

A file being read or written sequentially should not have its pages replaced in LRU order, because _____________


ait is very costly


bthe most recently used page will be used last


cit is not efficient


dall of the mentioned



In ___________ writes, the data is stored in the cache.


aAsynchronous


bRegular


cSynchronous


dIrregular


View Answer Asynchronous

____________ writes occur in the order in which the disk subsystem receives them, and the writes are not buffered.


aAsynchronous


bRegular


cSynchronous


dIrregular


View Answer Synchronous

By preallocating the inodes and spreading them across the volume, we ___________ the system performance.


aimprove


bdecrease


cmaintain


ddo not affect


View Answer improve

In UNIX, even an ’empty’ disk has a percentage of its space lost to ______


aprograms


binodes


cvirtual memory


dstacks


View Answer inodes

_______ tend to represent a major bottleneck in system performance.


aCPUs


bDisks


cPrograms


dI/O


View Answer Disks

All the changes that were done from a transaction that did not commit before the system crashed, have to be _________


asaved


bsaved and the transaction redone


cundone


dnone of the mentioned


View Answer undone

What is a circular buffer?


awrites to the end of its space and then continues at the beginning


boverwrites older values as it goes


call of the mentioned


dnone of the mentioned



When an entire committed transaction is completed, ___________


ait is stored in the memory


bit is removed from the log file


cit is redone


dnone of the mentioned



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