Explain why in a deferred-update system, the system does not first copy the intentions list into the database and then append the commit record to the log.
What will be an ideal response?
Because the intentions list and the update records do not contain before-images. If the system should crash after the database has been updated, but before the commit record has been appended to the log, there would be no way to roll the transaction back.
Computer Science & Information Technology
You might also like to view...
Yield is the amount of annual interest, expressed as a percentage of the par value and determines how much investors will receive on their investment
Indicate whether the statement is true or false.
Computer Science & Information Technology
Which of the following statements best describes metadata?
A. Information about websites visited B. Files that the operating system by design does not display C. Details about a file that describe or identify it D. Temporary storage area for web documents
Computer Science & Information Technology