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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