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

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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

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cCompensation log records

✓


dCompensation redo records

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


aRepeating

✓


bRedo

✖


cReplay

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dUndo

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View Answer Repeating

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