Oracle 11G OCP 1Z0-052 21

（21）Which three statements are true about logical structures of the Oracle database? (Choose three.)

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.

答案：（A、C、D）

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