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select * from ±íÃû as of timestamp sysdate-1/12 //²éѯÁ½¸öСʱǰµÄij±íÊý¾Ý£¡¼ÈÈ»Á½Ð¡Ê±ÒÔǰµÄÊý¾Ý¶¼µÃµ½ÁË£¬¼ÌÐøÔõô×ö£¬ÖªµÀÁ˰ɡ£¡£

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drop table ±íÃû;
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flashback table ±íÃû to before drop;

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SELECT /*+ rule */ s.username,
decode(l.type,'TM','TABLE LOCK',
'TX','ROW LOCK',
NULL) LOCK_LEVEL,
o.owner,o.object_name,o.object_type,
s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
from v$session s,v$lock l,dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username is NOT NULL;
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alter system kill session 'sid,serial';
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select * from dba_user;
select * from all_users;
select * from user_users;


2.²é¿´Óû§ÏµÍ³È¨ÏÞ£º
select * from dba_sys_privs;
select * from all_sys_privs;
select * from user_sys_privs;


3.²é¿´Óû§¶ÔÏóȨÏÞ£º
select * from dba_tab_privs;
select * from all_tab_privs;
select * from user_tab_privs;


4.²é¿´ËùÓнÇÉ«£º
select * from dba_roles;


5.²é¿´Óû§ËùÓµÓеĽÇÉ«£º
select * from dba_role_privs;
select * from user_role_privs;

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select * from dba_user;
2. Ö»²éѯÓû§ºÍÃÜÂë
select username,password from dba_users;
3. ²éѯµ±Ç°Óû§ÐÅÏ¢
select * from dba_ustats;
4. ²éѯÓû§¿ÉÒÔ·ÃÎʵÄÊÓͼÎı¾
select * from dba_varrays;
5. ²éѯÊý¾Ý¿âÖÐËùÓÐÊÓͼµÄÎı¾
select * from dba_views;
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