Crash Recovery BWT

What is crash recovery in the context of computer systems?

• Restoring a crashed system to its previous state

• Recovering data from a crashed hard drive

• Restarting the computer after a crash

• Repairing damaged system files

1. What is a transaction in the context of crash recovery?

• 1. a) A system backup process

• 1. b) A failed computer component

• 1. c) An atomic unit of work that must be completed as a whole

• 1. d) A type of software update

1. What is a write-ahead log (WAL) in crash recovery?

• 1. a) A log file that records changes before they are applied to the database

• 1. b) A backup file created after a crash

• 1. c) A tool to analyze crash reports

• 1. d) A software feature to prevent crashes from happening

Which of the following statements about the ARIES recovery algorithm is true?

• A) ARIES stands for "Advanced Recovery and Isolation Enhancement System."

• B) ARIES is a crash recovery algorithm specifically designed for distributed databases.

• C) ARIES uses a combination of undo and redo logging to ensure database recovery.

• D) ARIES does not support write-ahead logging.

Which of the following is a condition that can result in a transaction failure?

• Network speed issues

• User error in data entry

• Increased database size

• Power failure on machine

What is the purpose of the analysis phase in ARIES recovery?

• To restore the database to its original state

• To compute necessary information from the log file

• To create a backup of the database

• To delete all uncommitted transactions

Crash recovery ensures the database returns to a:

• Random state

• Unused state

• Consistent and usable state

• Archived state

Who is the inventor of ARIES?

• Alan Turing

• Dennis Ritchie

• Dr. C. Mohan

• Charles Babbage

What is the first principle of ARIES?

• Data replication

• Write Ahead Logging

• Logging rollback

• Checkpointing

What is a log in database systems?

• A firewall

• A backup device

• A file storing changes made to the database

• An image file