Author Question: Recovering a database via rollforward involves ________. A) restoring the database from the save ... (Read 94 times)

altibaby · **on:** Jul 7, 2018

Recovering a database via rollforward involves ________.

A) restoring the database from the save and reprocessing all the transactions since the save
B) restoring the database from the save and reapplying all the changes made by transactions since the save
C) undoing the changes made by erroneous or partially processed transactions and restarting the valid transactions that were in process at the time of the failure
D) re-creating the database by re-entering all of the data from the beginning, and then reprocessing all of the transactions

Question 2

Maximum cardinalities are represented in UML-style E-R diagrams with the same notation (1:1, 1:N, N:M) as in traditional E-R diagrams.

Indicate whether the statement is true or false