在oracle中,可以利用drop語句刪除schema,語法為「drop user username cascade;」;drop語句用來刪除表的結構,包括schema,schema是資料庫物件的集合,也可以理解為用戶。
本教學操作環境:Windows10系統、Oracle 11g版、Dell G3電腦。
刪除schema語法如下:
drop user username cascade;
範例如下:
set lines 300 col username for a30 select username ,default_tablespace,TEMPORARY_TABLESPACE from dba_users where username='MESPRD'; ----------------------------------- USERNAME DEFAULT_TABLESPACE TEMPORAR Y_TABLESPACE MESPRD HTTBS_MESPRD TEMP2)查看該使用者的權限和角色
select privilege from dba_sys_privs where grantee='SYSADM' union select privilege from dba_sys_privs where grantee in (select granted_role from dba_role_privs where grantee='MESPRD' ); ----------------------------------- PRIVILEGE CREATE CLUSTER CREATE INDEXTYPE CREATE OPERATOR CREATE PROCEDURE CREATE SEQUENCE CREATE SESSION CREATE TABLE CREATE TRIGGER CREATE TYPE已選擇9行。 3)取得獲得授予使用者權限的腳本
select 'grant '||privilege||' to SYSADM;' from (select privilege from dba_sys_privs where grantee='SYSADM' union select privilege from dba_sys_privs where grantee in (select granted_role from dba_role_privs where grantee='SYSADM' ));4)執行腳本取得刪除該schema下物件的腳本 mesprd為要刪除的schema
connect mesprd/MESPRD spool E:\app\Administrator\del_mesprd.sql; select 'alter table '||table_name||' drop constraint '||constraint_name||' ;' from user_constraints where constraint_type='R'; select 'truncate table '||table_name ||';' from user_tables; select 'drop table '||table_name ||' purge;' from user_tables; select 'drop index '||index_name ||';' from user_indexes; select 'drop view ' ||view_name||';' from user_views; select 'drop sequence ' ||sequence_name||';' from user_sequences; select 'drop function ' ||object_name||';' from user_objects where object_type='FUNCTION'; select 'drop procedure '||object_name||';' from user_objects where object_type='PROCEDURE'; select 'drop package '|| object_name||';' from user_objects where object_type='PACKAGE'; select 'drop database link '|| object_name||';' from user_objects where object_type='DATABASE LINK'; spool off;#5)sqlplus連接到該schema下,執行如上取得的腳本執行前查看下該schema下的對象,執行後再次查看下該schema下的對象
@?\E:\app\Administrator\del_mesprd.sql; SQL> select object_type,count(*) from user_objects group by object_type;6)kill掉連接資料庫的session
select 'alter system kill session '''||sid||','||serial#||''' immediate;' from v$session where username='MESPRD';7)刪除該schema
drop user MESPRD cascade;推薦教學:《
Oracle影片教學》
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