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.
正确答案:C
答案解析:有
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