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DOS:
1. sqlplus
2. 
   Óû§Ãû:sqlplus ¡¢conn
   ÃÜÂë:as sysdba ¡¢as sysdba   
½âËø£º
3. ALTER USER DBSNMP ACCOUNT UNLOCK£»
½âËø£ºsystem
4. alter user system identified by manager;
5. Á¬½Ó£ºconnect system/manager
²é¿´Óû§È¨ÏÞÁÐ±í£º
select * from dba_users;
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--ɾ³ý±í¿Õ¼ä:
drop tablespace bjzyy2009 including contents and datafiles 
--´´½¨±í¿Õ¼ä:
CREATE TABLESPACE bjzyy2009 DATAFILE 
'F:\oracle\product\10.2.0\db_1\database\bjzyy2009.dbf' SIZE 2048M      
DEFAULT STORAGE 
( INITIAL 64K NEXT 64K MAXEXTENTS UNLIMITED PCTINCREASE 50 );
create tablespace bjzyy2009 
logging 
datafile 'bjzyy2009.dbf' 
size 32m 
autoextend on 
next 32m maxsize 2048m 
extent management local;
--ɾ³ýÓû§
drop user bjzyy cascade;
--½¨Á¢Óû§:
CREATE USER bjzyy2009 IDENTIFIED BY bjzyy2009          
DEFAULT TABLESPACE bjzyy2009;                      
 
--¸³ÓèȨÏÞ:
GRANT CONNECT TO bjzyy2009;                        
GRANT DBA TO bjzyy2009;
GRANT resource TO bjzyy2009;
--±¸·ÝÊý¾Ý¿â:
exp Óû§Ãû/ÃÜÂë@Êý¾Ý¿âÈ«¾ÖÃû file=µ¼³öÎļþ·ÅÖõÄλÖà owner=(Óû§Ãû)
exp jjjw2008/jjjw2008@orcl owner=jjjw2008 file=d:/Ç¿ÖǿƼ¼/Êý¾Ý¿â±¸·Ý/jjjw200906121030.dmp;
µ¼ÈëÊý¾Ý:
$imp bjzyy2009/bjzyy2009@orcl190 file=F:\±±¾©ÖÐÒ½\bjzyy201001141030.dmp full=y ignore=y
    
     
	
	
    
    
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create global temporary table myemp as select * from emp;
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alter table dept modify (Dname char(20));
alter table dept add (headcount number(3));
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create table emp3 as select * from emp;
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create table emp4 as selec ......
	
    
        
    
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