在使用Oracle数据库的时候，经常会遇到需要把一个用户的所有对象重新导入的操作。这里介绍两种常用的方法，方便大家使用。
一、使用drop user cascade; 可以删除用户及所相关的所有对象，可以通过重新创建一个同名对象，然后使用imp 命令从dmp文件导入新的对象。
二、通过脚本把清空用户的所有对象，包含数据表、函数、存储过程等其他对象。采用这种方法，可以无需dba权限，在你需要完整导入一个用户数据的时候非常好用。
附：清除用户对象脚本
--PL/SQL Developer Test script 3.0
--120
------------------------------------------------------------------
-- Created on 2007-5-18 by GUIPEI
-- drop oracle user's all objects
--
--
------------------------------------------------------------------
DECLARE
-- Local variables here
i INTEGER;
CURSOR cur_objects(obj_type VARCHAR2) IS
SELECT object_name FROM user_objects WHERE object_type IN (obj_type);
obj_name VARCHAR(200);
sql_str VARCHAR(500);
BEGIN
--drop all tables;
OPEN cur_objects('TABLE');
LOOP
FETCH cur_objects
INTO obj_name;
EXIT WHEN cur_objects%NOTFOUND;
dbms_output.put_line('delete table: ' || obj_name);
sql_str := 'drop table ' || obj_name || ' CASCADE CONSTRAINTS ';
EXECUTE IMMEDIATE sql_str;
END LOOP;
CLOSE cur_objects;
--drop all SEQUENCE;
OPEN cur_objects('SEQUENCE');
LOOP
FETCH cur_objects
INTO obj_name;
EXIT WHEN cur_objects%NOTFOUND;
dbms_output.put_line('delete SEQUENCE: ' || obj_name);
sql_str := 'drop SEQUENCE ' || obj_name;
EXECUTE IMMEDIATE sql_str;
END LOOP;
CLOSE cur_objects;
--drop all VIEW;
OPEN cur_objects('VIEW');
LOOP
FETCH cur_objects
INTO obj_name;
EXIT WHEN cur_objects%NOTFOUND;
dbms_output.put_line('delete VIEW: ' || obj_name);
sql_str := 'drop VIEW ' || obj_name || ' CASCADE CONSTRAINTS ';
EXECUTE IMMEDIATE sql_str;
END LOOP;
CLOSE cur_objects;
--drop all FUNCTION;
OPEN cur_objects('FUNCTION');
LOOP
FETCH cur_objects
INTO obj_name;
EXIT WHEN cur_objects%NOTFOUND;
dbms_output.put_line('delete FUNCTION: ' || obj_name);
sql_str := 'drop FUNCTION ' || obj_name;
EXECUTE IMMEDIATE sql_str;
END LOOP;
CLOSE cur_objects;
--drop all PROCEDURE;
OPEN cur_objects('PROCEDURE');
LOOP
FETCH cur_objects
INTO obj_name;
EXIT WHEN cur_objects%NOTFOUND;
dbms_output.put_line('delete PROCEDURE: ' || obj_name);
sql_str := 'drop PROCEDURE ' || obj_name;
EXECUTE IMMEDIATE sql_str;
END LOOP;
CLOSE cur_objects;
--drop all PACKAGE;
OPEN cur_objects('PACKAGE');
LOOP
FETCH cur_objects
INTO obj_name;
EXIT WHEN cur_objects%NOTFOUND;
dbms_output.put_line('delete PACKAGE: ' || obj_name);
sql_str := 'drop PACKAGE ' || obj_name;
dbms_output.put_line(sql_str);
EXECUTE IMMEDIATE sql_str;
END LOOP;
CLOSE cur_objects;
END;
oracle解锁的SQL....
select t2.username,t2.sid,t2.serial#,t2.logon_time from v$locked_object t1,v$session t2 where t1.session_id=t2.sid order by t2.logon_time;--查看锁--alter system kill session 'sid,serial#';--把锁给KILL掉alter system kill session '146,21177';