create tablespace ybp_dev datafile ‘G:\app\Administrator\oradata\health\ybp_dev1.dbf‘ size 10m autoextend on;

create user 用戶名 default tablespace 表空間名 identified by 用戶密碼;

grant connect,resource to 用戶;

測試連接 conn mpi/1234


刪除表空間
drop tablespace XX including contents and datafiles cascade constraints;
 
//including contents 刪除表空間的內容
//cascade constraints同時刪除
tablespace中表的外鍵參照



刪除用戶
drop user USERNAME CASCADE;
如提示ora-01940 無法刪除已經連接會話的用戶
select username,sid,serial# from v$session where username like ‘HIP4‘
找到要刪除用戶的sid,和serial，並刪除
alter system kill session‘532,4562‘


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su - oracle   -切換oracle用戶
sqlpus / as sysdba   -本地登錄sqlplus
select * from dba_directories;  -查詢路徑
drop directory dp_dir;   -刪除目錄
create directory dp_dir as ‘/backup/dp_dir‘;  -創建目錄
grant read,write on directory dp_dir to public;  -賦權目錄
expdp xx/xx directory=dp_dir dumpfile=xxx.dmp schemas=xxx  --
 
導出


例  expdp ‘"/as sysdba"‘ directory=dp_dir dumpfile=xx1207.dmp schemas=xx
impdp ‘"/as sysdba"‘ directory=dp_dir dumpfile=1112mdbyl.dmp   --導入.註意此處不加封 封號！！！！

impdp ‘"/as sysdba"‘ directory=dp_dir dumpfile=1112mdbyl.dmp remap_schema=mdbyl:mdbyl3   --導入改名


select file_name,tablespace_name from dba_data_files; --查詢數據文件路徑


select username,default_tablespace from dba_users where username like ‘X%‘;  --模糊查詢x開頭的用戶

SELECT * FROM V$SESSION WHERE USERNAME=‘PINGTAI‘;

alter system kill session ‘3406,1671‘;
drop user PINGTAI cascade;
---------------------------------------------------
SELECT t.table_name,
       t.colUMN_NAME,
       t.DATA_TYPE || ‘(‘ || t.DATA_LENGTH || ‘)‘,
       t1.COMMENTS
  FROM User_Tab_Cols t, User_Col_Comments t1
WHERE t.table_name = t1.table_name
    AND t.column_name = t1.column_name(+);

DDL及其數據泵導入導出（impdp/expdp）