JFE301Xuất hiện trong 1 đề thi
In a relational database system, which of the following is an appropriate purpose of recording changes in a database file as a journal file?
Các lựa chọn
ATo determine whether to commit or roll back the database updates
BTo enable recovery to be undertaken effectively in the event of a failure
CTo move transaction log records to the database backup files
DTo support concurrency control of the simultaneous execution of transactions