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=‘SAS‘;

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 WX_RUN_USER 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;

Oracle用户信息查询