Create Database Link in Oracle

CREATE DATABASE LINK <DB_LINK_NAME>
CONNECT TO <SCHEMA> IDENTIFIED BY <PASSWORD>
USING '(DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP) (Host = <HOST>) (PORT = <PORT>))) (CONNECT_DATA = (SERVICE_NAME = <SERVICE_NAME>)))';

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Learn Oracle CREATE DATBASE LINK Statement By Practical Examples

CREATE DATABASE LINK