oracle怎么刪除schema

在oracle中，可以利用drop語句刪除schema，語法為“drop user username cascade;”；drop語句用于刪除表的結(jié)構(gòu)，包括schema，schema是數(shù)據(jù)庫對(duì)象的集合，也可以理解為用戶。

本教程操作環(huán)境：Windows10系統(tǒng)、Oracle 11g版、Dell G3電腦。

oracle怎么刪除schema

刪除schema語法如下：

drop user username cascade;

示例如下：

1)查看用戶的默認(rèn)表空間及臨時(shí)表空間

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                        TEMP

2)查看該用戶的權(quán)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)獲取獲得授予用戶權(quán)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(zhí)行腳本獲得刪除該schema下對(duì)象的腳本 mesprd為要?jiǎng)h除的schema

connect mesprd/MESPRD spool E:appAdministratordel_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(zhí)行如上獲得的腳本

執(zhí)行前查看下該schema下的對(duì)象，執(zhí)行后再次查看下該schema下的對(duì)象

@？E:appAdministratordel_mesprd.sql; SQL> select object_type,count(*) from user_objects group by object_type;

6)kill掉連接數(shù)據(jù)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;

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