查看oracle中所有用户信息

以下不知道从哪抄的内容，分享给大家。

1.查看所有用户：

select * from dba_users;  
select * from all_users;  
select * from user_users;

 

2.查看用户或角色系统权限(直接赋值给用户或角色的系统权限)：

select * from dba_sys_privs;  
--查看当前用户所拥有的权限
select * from user_sys_privs; 

 

3.查看角色(只能查看登陆用户拥有的角色)所包含的权限

select * from role_sys_privs;

 

4.查看用户对象权限：

select * from dba_tab_privs;  
select * from all_tab_privs;  
select * from user_tab_privs;

 

5.查看所有角色：

select * from dba_roles;

 

6.查看用户或角色所拥有的角色：

select * from dba_role_privs;  
select * from user_role_privs;

 

7.查看哪些用户有sysdba或sysoper系统权限(查询时需要相应权限)

select * from V$PWFILE_USERS

 

8.SqlPlus中查看一个用户所拥有权限

select * from dba_sys_privs where grantee =  'username';
--其中的username即用户名要大写

 

 9.Oracle删除指定用户所有表的方法

select 'Drop table '||table_name||';' from all_tables
where owner='要删除的用户名(注意要大写)';

 

10.删除用户

drop user user_name cascade;

 

 11.获取当前用户下所有的表：

SELECT * FROM ALL_TABLES WHERE OWNER = 'username';

SELECT OWNER,COUNT(*) FROM ALL_TABLES GROUP BY OWNER;

SELECT COUNT(*) FROM TABS;

SELECT COUNT(*) FROM USER_TABLES;

SELECT * FROM DBA_SEQUENCE WHERE SEQUENCE_OWNER='username';

 

12.删除某用户下所有的表数据: 

select 'truncate table  ' || table_name from user_tables;

 

13.禁止外键

ORACLE数据库中的外键约束名都在表user_constraints中可以查到。其中constraint_type='R'表示是外键约束。

--启用外键约束的命令
alter table table_name enable constraint constraint_name;
--禁用外键约束的命令
alter table table_name disable constraint constraint_name;

--用SQL查出数据库中所以外键的约束名：
select 'alter table '||table_name||' enable constraint '||constraint_name||';' from user_constraints where constraint_type='R';

select 'alter table '||table_name||' disable constraint '||constraint_name||';' from user_constraints where constraint_type='R';

 14.ORACLE禁用/启用外键和触发器

--启用脚本
SET SERVEROUTPUT ON SIZE 1000000
BEGIN
for c in (select 'ALTER TABLE '||TABLE_NAME||' ENABLE CONSTRAINT '||constraint_name||' ' as v_sql from user_constraints where CONSTRAINT_TYPE='R') loop
DBMS_OUTPUT.PUT_LINE(C.V_SQL);
begin
 EXECUTE IMMEDIATE c.v_sql;
 exception when others then
 dbms_output.put_line(sqlerrm);
 end;
end loop;
for c in (select 'ALTER TABLE '||TNAME||' ENABLE ALL TRIGGERS ' AS v_sql from tab where tabtype='TABLE') loop
 dbms_output.put_line(c.v_sql);
 begin
 execute immediate c.v_sql;
exception when others then
 dbms_output.put_line(sqlerrm);
 end;
end loop;
end;
/
commit;
--禁用脚本
SET SERVEROUTPUT ON SIZE 1000000
BEGIN
for c in (select 'ALTER TABLE '||TABLE_NAME||' DISABLE CONSTRAINT '||constraint_name||' ' as v_sql from user_constraints where CONSTRAINT_TYPE='R') loop
DBMS_OUTPUT.PUT_LINE(C.V_SQL);
begin
 EXECUTE IMMEDIATE c.v_sql;
 exception when others then
 dbms_output.put_line(sqlerrm);
 end;
end loop;
for c in (select 'ALTER TABLE '||TNAME||' DISABLE ALL TRIGGERS ' AS v_sql from tab where tabtype='TABLE') loop
 dbms_output.put_line(c.v_sql);
 begin
 execute immediate c.v_sql;
exception when others then
 dbms_output.put_line(sqlerrm);
 end;
end loop;
end;
/
commit;