如何查询Oracle中所有用户信息

时间：2019-02-23 10:17:04 阅读：151 评论：0 收藏：0 [点我收藏+]

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

3.查看角色(只能查看登陆用户拥有的角色)所包含的权限

sql>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

SQL>select * from dba_sys_privs where grantee=‘username‘; 其中的username即用户名要大写才行。
比如： SQL>select * from dba_sys_privs where grantee=‘TOM‘;

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; 如：drop user SMCHANNEL CASCADE

11、获取当前用户下所有的表：

select table_name from user_tables;

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为：alter table table_name enable constraint constraint_name 
禁用外键约束的命令为：alter table table_name disable constraint constraint_name

然后再用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;