如何查询Oracle中所有用户信息

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

复制代码
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;
复制代码

–禁用脚本

复制代码
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;

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