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select * from dict_columns;
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select username,default_tablespace from user_users;
-- get roles for current user
select * from us ......
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--ÒÔϼ¸¸öΪÏà¹Ø±í
SELECT * from v$lock;
SELECT * from v$sqlarea;
SELECT * from v$session;
SELECT * from v$process ;
SELECT * from v$locked_object;
SELECT * from all_objects;
SELECT * from v$session_wait; ......
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