How to connect Oracle and Sql server

Method 1) Oracle connect to Sql server

Using Oracle Gateway in 11g, if the database version is 10g, patch 5965763 should be installed on it.
Step1: Install Oracle gateway at an existing Oracle 11g home or a new home, and configure listener, oracle gateway for Sql server initial file:
In our example, using new ORACLE_HOME /u01/app/oracle/product/11.1.0/db_1
1) [...]