053-430

Which of the following is a prerequisite for running DBMS_TDB.CHECK_DB to a successful completion?
A. The database must be in read-write mode.
B. The database must have no external files.
C. The database must open in read-only mode.
D. The database must be mounted but not opened.

　　The DBMS_TDB.CHECK_DB function must execute with the database open and in readonly mode.