The External Data Mart feature is configured to work with a PostgreSQL database by default. This is an open-source database and therefore the required driver is distributed with the Context Store software.
If you are using an Oracle or Microsoft SQL Server database, Avaya Context Store does not have permission to re-distribute the required drivers. The JDBC driver must therefore be manually loaded into the Breeze Element Manager and then installed on the Context Store cluster. See instructions for doing this in the Loading JDBC driver to System Manager section in the Avaya Context Store Snap-in Reference guide.