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多选题
Which three statements are true regarding the logical structure of the Oracle database？（）
A
Each segment contains one or more extents.
B
Multiple tablespaces can share single data file.
C
A data block is the smallest unit of I/O for 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 OS block.
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更多 “多选题Which three statements are true regarding the logical structure of the Oracle database？（）AEach segment contains one or more extents.BMultiple tablespaces can share single data file.CA data block is the smallest unit of I/O for data files.DIt is possible to have tablespaces of different block sizes in a database.EEach data block in the database always corresponds to one OS block.” 相关考题
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The Oracle database will perform block checking for the data blocks in all user tablespaces.D
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单选题The DB_BLOCK_CHECKING initialization parameter is set to TRUE. What would be the result of this setting on the data blocks being written to the datafiles， every time the DBWn writes？（）A
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The Oracle database will check data blocks belonging to the SYSAUX tablespace only， by going through the data on each block， making sure the data is self-consistent.E
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