Database Management Systems Mcqs

Page No. 73

Locks on buffer blocks are unrelated to locks used for concurrency-control of transactions, and releasing them in a non-two-phase manner does not have any implications on transaction serializability. This is


aLatches


bSwap Space


cDirty Block


dNone of the mentioned


View Answer Latches

The ___________ policy, allows the system to write modified blocks to disk even if the transactions that made those modifications have not all committed.


aForce


bNo-force


cSteal


dNo-steal


View Answer Steal

______________ policy allows multiple updates to accumulate on a block before it is output to stable storage, which can reduce the number of output operations greatly for frequently updated blocks.


aForce


bNo-force


cSteal


dNo-steal


View Answer No-force

The _______________ policy, allows a transaction to commit even if it has modified some blocks that have not yet been written back to disk.


aForce


bNo-force


cSteal


dNo-steal


View Answer No-force

Writing the buffered log to __________ is sometimes referred to as a log force.


aMemory


bBackup


cRedo memory


dDisk


View Answer Disk

Before a block of data in main memory can be output to the database, all log records pertaining to data in that block must have been output to stable storage. This is


aRead-write logging


bRead-ahead logging


cWrite-ahead logging


dNone of the mentioned


View Answer Write-ahead logging

The order of log records in the stable storage ____________ as the order in which they were written to the log buffer.


aMust be exactly the same


bCan be different


cIs opposite


dCan be partially same



In order to reduce the overhead in retrieving the records from the storage space we use


aLogs


bLog buffer


cMedieval space


dLower records


View Answer Log buffer

A special redo-only log record < Ti, Xj, V1> is written to the log, where V1 is the value being restored to data item Xj during the rollback. These log records are sometimes called


aLog records


bRecords


cCompensation log records


dCompensation redo records



The actions which are played in the order while recording it is called ______________ history.


aRepeating


bRedo


cReplay


dUndo


View Answer Repeating

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