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多选题
Which three 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.
参考答案
参考解析
解析：
A答案：每个段包含一个或多个区，正确。
B答案：一个数据文件只能属于一个表空间，故错误。
C答案：Oracle data block是最小的I/O单位，正确
D答案：可以是不同的块大小，需要指名非标准块的位置。
E答案：每个数据库里面的数据库对应一个或多个操作系统块，故E错误。
B答案：一个数据文件只能属于一个表空间，故错误。
C答案：Oracle data block是最小的I/O单位，正确
D答案：可以是不同的块大小，需要指名非标准块的位置。
E答案：每个数据库里面的数据库对应一个或多个操作系统块，故E错误。
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