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.
题目
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.