Linking Oracle with Teradata

Question:  I am using oracle 8i, and I would like to read data from teradata using public link and views.

Is this possible?  If so, what is the preferred method and how would I set it up?

Answer:  There are multiple ways to link Oracle with teradata:

• Oracle Gateway links to teradata via a gateway listener

• Heterogeneous Services offers an extra cost option for linking to teradata

• GoldenGate provides a link to teradata

• ODBC link with teradata via ODBD

Linking Oracle to teradata via Oracle Gateway requires that a listener be defined:

SID_LIST_LISTENER=
(SID_LIST=
(SID_DESC=.
.
)
(SID_DESC=.
.
)
(SID_DESC=
(SID_NAME=gateway_sid)
(ORACLE_HOME=oracle_home_directory)
(PROGRAM=dg4tera) (ENVS=PATH=oracle_home_directory\bin;teradata_client_directory\lib;Windows_system_paths)
)
)

Heterogeneous services, for additional cost, allows linking to teradata a variety of ways, including via MySQL connection.

GoldenGate, also an additional cost tool, will interface with just about any database.

Connecting an Oracle database to teradata via an ODBC connection via ODBD is possible, but it can be very slow.  These slow speeds can make this route of connection of an Oracle database to teradata prohibitive.

Setting up the ODBC connection between Oracle and teradata is the same as setting up any other ODBC connection.  The ODBC driver for the Oracle to teradata connection is available with a simple Google search.  The steps are:

1. Install ODBC drivers for the Teradata database. The drivers are installed on your laptop or on the server that contains the Oracle code tree.
2. Setup the ODBC connection on your laptop using the Windows ODBC Data Source Administrator
3.  Test the ODBC drivers to ensure that connectivity is made to the non-Oracle database.
4. Ensure the Global_names parameter is set to False in the Oracle database.
5. Configure the Hetergeneous services. This consists of creating an initodbc.ora file within the Oracle database installation.
6.  Modify the Listener.ora file on the database installation to connect to the Oracle instance and ODBC drivers.
7. Modify the Tnsnames.ora file to point to the proper code tree.
8.  Reload the listener
9.  Create a database link on the Oracle installation.
10.  Run a Select statement for the Oracle installation using the database link.

As noted before, the ODBC method of connecting Oracle to teradata can be very slow, so it might beneficial to consider other options, even if there is some additional cost.  This is particularly applicable if you intend to use this type of connection on an ongoing basis to access the information you need.

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