单选题By default, checkpoints happen at least as often as（）.ARedo log switches. BUPDATE statements are issued against the database. CThe SYSTEM tablespace is accessed. DSMON coalesces free space in a tablespase.
单选题
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.
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