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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