You want to make sure that your database backup does not exceed 10 hours in length. What
command would you issue that would meet this condition?
A. backup database plus archivelog;
B. backup database plus archivlog until time 10:00;
C. backup database plus archivelog timeout 10:00;
D. backup database plus archivelog duration 10:00;
E. backup database plus archivelog timeout 10:00;
原文：http://www.cnblogs.com/Babylon/p/7815444.html