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Database Transaction Problems Quiz

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Questions and Answers

What is the purpose of taking three or four checkpoints an hour in a database system?

To lower the frequency of backup operations.

To reduce the recovery time needed in case of failure. (correct)

To increase the speed of transaction processing.

To minimize the risk of database corruption.

Why is it recommended to store the log file on a separate disk from the main database files?

To ensure faster access to log data.

To lower the risk of both database files and log file being damaged simultaneously. (correct)

To simplify the recovery process.

To reduce overall storage costs.

In case of extensive damage to a database due to a disk head crash, what is the primary step needed for recovery?

Restore the last backup copy of the database on a replacement disk. (correct)

Create a new log file from scratch.

Transfer the corrupted data to an external hard drive.

Completely rebuild the database structure.

What action is necessary if a database becomes inconsistent due to a system crash during transaction execution?

Undo the changes that caused inconsistency and redo necessary transactions. Signup and view all the answers

What does the recovery procedure involve when a database has not been physically damaged?

Reapplying the update operations on committed transactions using the log file. Signup and view all the answers

In the context of deadlock prevention, what is the primary action taken if a lock request times out?

The DBMS assumes deadlock and aborts then restarts the transaction. Signup and view all the answers

What solution is used by several commercial DBMSs for deadlock prevention if a lock request times out?

Assuming deadlock and aborting then restarting the transaction. Signup and view all the answers

Which of the following algorithms allows only older transactions to wait for younger ones in case of a lock request conflict?

Wait-Die Signup and view all the answers

What is the symmetrical approach used in the Wound-Wait algorithm for resolving lock request conflicts?

Only younger transactions can wait for older ones. Signup and view all the answers

Which variant of the Two-Phase Locking protocol ensures that transactions obtain all their locks at the beginning or wait until all the locks are available?

Conservative 2PL Signup and view all the answers

'Wound-Wait' and 'Wait-Die' algorithms were proposed by which researchers?

Rosenkrantz et al. Signup and view all the answers

'Conservative 2PL' differs from 'Basic 2PL' by:

Ensuring all locks are obtained at the start of a transaction. Signup and view all the answers

'Livelock' in transactions can occur when:

'Conservative 2PL' is implemented without proper timeout mechanisms. Signup and view all the answers

'Extensive damage caused by disk head crash' is an issue related to:

'Two-phase locking protocol.' Signup and view all the answers

What is the primary aim of using 'symmetrical approaches' in algorithms like 'Wound-Wait?'

To ensure equal treatment between younger and older transactions. Signup and view all the answers