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
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
;
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管理员查看所有用户