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startup [ nomount | mount | open | force ] [ restrict ] [ pfile=filename ];
·½·¨1 -- startup nomount ; alter database mount ;alter database open
·½·¨2 -- startup mount ; alter database open
·½·¨3 -- startup »ò startup open
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alter system disable restricted session
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shutdown ÃüÁî¸ñʽ
shutdown [ normal | transactional | immediate | abort ];
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