问题描述：
Which of these statements is always true?
A.A database must contain at least three datafiles.
B.Control files must be mirrored.
C.A database has at least two groups of redo log files.
D.The members of a redo log group can have various sizes if they can be stored on one disk.
A.A database must contain at least three datafiles.
B.Control files must be mirrored.
C.A database has at least two groups of redo log files.
D.The members of a redo log group can have various sizes if they can be stored on one disk.
问题解答：
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