Question: When
do use the Oracle "grant connect through" clause? I
understand that "grant connect through is used as a proxy
when using database links? Can you give an example of
"grant connect through"?
Answer: You are correct that "grant
connect through" is a proxy (available since 9i release 2),
but it is used when you want to be able to connect as a user
without knowing their password.
Also see
proxy connect, which uses database links.
For example, If I
wanted to connect as the fred user, I could issue this
"grant connect through" syntax:
create user through_user
identified by zeus;
alter user fred grant connect through through_user;
There is also a corresponding revoke command to revoke
the connect through syntax:
alter user fred revoke connect
through through_user;
Now that we have create a "grant connect through"
assigned to user "fred", we can connect
connect through_user[fred]/zeus;
Connected.
SQL> show user
USER is "FRED"
In addition
to the "grant connect through" syntax, Oracle also provided
a proxy user:
select * from proxy_users;
PROXY
CLIENT
AUT FLAGS
------------------------------
------------------------------ ---
-----------------------------------
THROUGH_USER
FRED
NO PROXY MAY ACTIVATE ALL CLIENT ROLES
- Here we call sys_context to reveal the proxy user:
select sys_context('USERENV','PROXY_USER')
from dual;
SYS_CONTEXT('USERENV','PROXY_USER')
---------------------------------------
THROUGH_USER
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