a. alter database begin backup;
b. alter database end backup;
c. Back up the database datafiles.
d. Back up the archive log files.
e. alter system switch logfile;
A. a,b,c,d,e
B. e,d,a,b,c
C. a,c,b,d,e
D. d,b,c,a,e
E. a,c,b,e,d
答案:(E)
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