Database Management Systems Mcqs

Page No. 69

A transaction commits as soon as its commit log record is written to stable storage at the primary site. This is


aOne Safe

✓


bTwo Safe

✖


cTwo-very Safe

✖


dVery Safe

✖


View Answer One Safe

A _______________ configuration can make takeover by the backup site almost instantaneous.


aHot-spare

✖


bRemote

✖


cDirect

✖


dSpare

✓


View Answer Spare

The time to process the remote backup can be reduced by


aFlags

✖


bBreakpoints

✖


cRedo points

✖


dCheckpoints

✓


View Answer Checkpoints

The simplest way of transferring control is for the old primary to receive __________ from the old backup site.


aUndo logs

✖


bRedo Logs

✖


cPrimary Logs

✓


dAll of the mentioned

✖


View Answer Primary Logs

When the __________ the backup site takes over processing and becomes the primary.


aSecondary fails

✖


bBackup recovers

✖


cPrimary fails

✓


dNone of the mentioned

✖


View Answer Primary fails

The backup is taken by


aThe backup is taken by

✖


bEntering the new records

✖


cSending all log records from primary site to the remote backup site

✓


dSending selected records from primary site to the remote backup site

✖



Remote backup system must be _________ with the primary site.


aSynchronized

✓


bSeparated

✖


cConnected

✖


dDetached but related

✖


View Answer Synchronized

The remote backup site is sometimes also called the


aPrimary Site

✖


bSecondary Site

✓


cTertiary Site

✖


dNone of the mentioned

✖


View Answer Secondary Site

If ___________ are not obtained in undo operation it will cause problem in undo-phase.


aHigher-level lock

✖


bLower-level lock

✓


cRead only lock

✖


dRead write

✖


View Answer Lower-level lock

For correct behavior during recovery, undo and redo operation must be


aCommutative

✖


bAssociative

✖


cIdempotent

✓


dDistributive

✖


View Answer Idempotent

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