Oracle與異質DB建立DBLINK

Oracle Database Gateways 提供下列四項模組
Transparent Gateway for Sybase
Transparent Gateway for SQL Server
Transparent Gateway for Teradata
Transparent Gateway for Informix
Generic Connectivity （ODBC免費版本）

You can install Oracle Database Gateway in either of the following configurations:
* On the same computer as an existing Oracle database but in a different Oracle home.（不同目錄，可安裝不同版本）
* On a system with no Oracle database.（愛裝那一套請自便）
* On the same computer as the Oracle database, and in the same Oracle home directory. Note that in this case,the Oracle database and the gateway must be at the same release level.（需配合原有版本）