单项选择题

Which of the following operations does not require Oracle to store information in an UNDO segments as part of the transaction?（）

A.INSERT
B.SELECT
C.UPDATE
D.DELETE

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单项选择题

To allocate another role to a user, which command is most appropriate?（）

A.ALTER USER
B.ALTER DATABASE
C.ALTER SYSTEM
D.GRANT

单项选择题

You are attempting to clear an unarchived redo log file. In order to manually enact a log switch, which of the following statements is appropriate?（）

A.ALTER DATABASE
B.ALTER SYSTEM
C.ALTER USER
D.ALTER REDO LOG

单项选择题

You are analyzing the components of the redo log mechanisms in your Oracle database. Which of the following purposes does the CKPT process serve?（）

A.Writes buffers to disk
B.Writes current redo log number to datafile headers
C.Writes redo log information to disk
D.Reads information into memory for users