多项选择题

Which statements are true regarding a tablespace（）

A.It can span multiple databases.
B.It can consist of multiple data files.
C.It can contain blocks of different sizes.
D.It can contain segments of different sizes.
E.It can contain a part of a nonpartitioned segment

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Which statements are true regarding listeners（）

A.Listeners use only the TCP/IP protocol.
B.Multiple listener processes can run simultaneously on a host.
C.Multiple database instances can be registered with a single listener.
D.The listener-related errors can be traced only at the administrative level.
E.Only one database instance can be registered with a single listener at any time

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You are managing an Oracle Database 11g database. You configured the database to run in ARCHIVELOGmode.
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D.All the previous closed database backups including control files become invalid after you configure thedatabase to ARCHIVELOG mode.

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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