By default, checkpoints happen at least as often as（）.<br>A:Redo log switches. <br>B:UPDATE statements are issued against the database. <br>C:The SYSTEM tablespace is accessed. <br>D:SMON coalesces free space in a tablespase.

By default, checkpoints happen at least as often as（）.
A:Redo log switches.
B:UPDATE statements are issued against the database.
C:The SYSTEM tablespace is accessed.
D:SMON coalesces free space in a tablespase.

出自：Oracle认证

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