Database Management Systems Mcqs

Page No. 41

The disk controller uses ________ at each sector to ensure that the data is not corrupted on data retrieval.


aChecksum


bUnit drive


cRead disk


dReadsum


View Answer Checksum

The disk platters mounted on a spindle and the heads mounted on a disk arm are together known as ___________


aRead-disk assemblies


bHead–disk assemblies


cHead-write assemblies


dRead-read assemblies



A __________ is the smallest unit of information that can be read from or written to the disk.


aTrack


bSpindle


cSector


dPlatter


View Answer Sector

In magnetic disk ________ stores information on a sector magnetically as reversals of the direction of magnetization of the magnetic material.


a Read–write head


bRead-assemble head


cHead–disk assemblies


dDisk arm


View Answer Disk arm

Tape storage is referred to as __________ storage.


aDirect-access


bRandom-access


cSequential-access


dAll of the mentioned


View Answer Sequential-access

There are “record-once” versions of the compact disk and digital video disk, which can be written only once; such disks are also called __________ disks.


aWrite-once, read-many (WORM)


bCD-R


cDVD-W


dCD-ROM



Optical disk _______ systems contain a few drives and numerous disks that can be loaded into one of the drives automatically (by a robot arm) on demand.


aTape Storage


bJukebox


cFlash memory


dAll of the mentioned


View Answer Jukebox

The primary medium for the long-term online storage of data is the __________ where the entire database is stored on magnetic disk.


aSemiconductor memory


bMagnetic disks


cCompact disks


dMagnetic tapes


View Answer Magnetic disks

Which is the cheapest memory device in terms of costs/ bit?


aSemiconductor memory


bMagnetic disks


cCompact disks


dMagnetic tapes


View Answer Compact disks

__________ is increasingly being used in server systems to improve performance by caching frequently used data, since it provides faster access than disk, with larger storage capacity than main memory.


aFlash memory


bDisk


cMain memory


dSecondary memory


View Answer Flash memory

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