Inwhichthreecasesdoesacheckpointoccur？（）A.Every three minutes.B.When a log switch occurs.C.When forces by an administrator.D.When a tablespace is taken offline normal.E.When the redo buffer is one-third full.

多项选择题

In which three cases does a checkpoint occur？（）

A.Every three minutes.
B.When a log switch occurs.
C.When forces by an administrator.
D.When a tablespace is taken offline normal.
E.When the redo buffer is one-third full.

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