case : scott user wantt to access objects of the sales user in same database by using dblink.(assume he has select any table privilege)
SQL> conn scott/tiger
Connected.
SQL> select * from session_privs;
PRIVILEGE
----------------------------------------
CREATE SESSION
ALTER SESSION
UNLIMITED TABLESPACE
CREATE TABLE
CREATE CLUSTER
CREATE SYNONYM
CREATE VIEW
CREATE SEQUENCE
CREATE DATABASE LINK
CREATE PROCEDURE
CREATE TRIGGER
PRIVILEGE
----------------------------------------
CREATE TYPE
CREATE OPERATOR
CREATE INDEXTYPE
14 rows selected.
SQL> create database link proddb connect to sales identified by password using 'proddblocal'
create database link proddb connect to sales identified by password using 'proddblocal'
*
ERROR at line 1:
ORA-02082: a loopback database link must have a connection qualifier
SQL> ed
Wrote file afiedt.buf
1 create database link proddb@proddb
2 connect to sales identified by password
3* using 'proddblocal'
SQL> /
Database link created.
SQL> select count(*) from dual@proddb ;
COUNT(*)
----------
1
SQL> select * from user_db_links;
DB_LINK USERNAME PASSWORD HOST
CREATED
proddb.sales.ORG@proddb sales password proddblocal
27-APR-07
SQL> conn sales/password@proddblocal
Connected.
SQL> select count(*) from tsales;
COUNT(*)
----------
246678
SQL> conn scott/tiger
Connected.
SQL> select count(*) from tsales@proddb@proddb;
COUNT(*)
----------
246678
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