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多項(xiàng)選擇題

Which statements are true about logical structures of the Oracle database()

A.Each segment contains one or more extents.
B.Multiple tablespaces can share a single data file
C.A data block is the smallest unit of input/output (I/O) in data files.
D.It is possible to have tablespaces of different block sizes in a database.
E.Each data block in the database always corresponds to one operating system block

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