551.Which command will result in a trace file being created with

551.Which command will result in a trace file being created with the create controlfile command contained in it?

A.alter database backup controlfile;

B.alter database backup controlfile to trace;

C.alter database controlfile backup;

D.alter database controlfile backup to '/ora01/oracle/ctrl_backup.ctl';

E.alter database begin controlfile backup;

正确答案是B

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