1.查看全部用戶:sql
select * from dba_users; 數據庫
select * from all_users; ide
select * from user_users;oop
2.查看用戶或角色系統權限(直接賦值給用戶或角色的系統權限):spa
select * from dba_sys_privs; 對象
select * from user_sys_privs; (查看當前用戶所擁有的權限)it
3.查看角色(只能查看登錄用戶擁有的角色)所包含的權限io
sql>select * from role_sys_privs;table
4.查看用戶對象權限:class
select * from dba_tab_privs;
select * from all_tab_privs;
select * from user_tab_privs;
5.查看全部角色: select * from dba_roles;
6.查看用戶或角色所擁有的角色:
select * from dba_role_privs;
select * from user_role_privs;
7.查看哪些用戶有sysdba或sysoper系統權限(查詢時須要相應權限)
select * from V$PWFILE_USERS
8.SqlPlus中查看一個用戶所擁有權限
SQL>select * from dba_sys_privs where grantee='username'; 其中的username即用戶名要大寫才行。
好比: SQL>select * from dba_sys_privs where grantee='TOM';
9、Oracle刪除指定用戶全部表的方法
select 'Drop table '||table_name||';' from all_tables where owner='要刪除的用戶名(注意要大寫)';
10、刪除用戶
drop user user_name cascade; 如:drop user SMCHANNEL CASCADE
11、獲取當前用戶下全部的表:
select table_name from user_tables;
12、刪除某用戶下全部的表數據:
select 'truncate table ' || table_name from user_tables;
13、禁止外鍵 ORACLE數據庫中的外鍵約束名都在表user_constraints中能夠查到。
其中constraint_type='R'表示是外鍵約束。
啓用外鍵約束的命令爲:alter table table_name enable constraint constraint_name
禁用外鍵約束的命令爲:alter table table_name disable constraint constraint_name
而後再用SQL查出數據庫中因此外鍵的約束名:
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/啓用外鍵和觸發器 --啓用腳本
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;
--禁用腳本
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;