The oci8 driver allows you to access Oracle Database 11g, 10g, 9i and 8i.
This module provides oci8 integration so that you can run queries on an Oracle database from Drupal. It also provides a mechanism to link a node to an Oracle table, with future development focusing on editing Oracle data and Views integration.
This module will not replace MySQL in Drupal. It will just allow you to connect to Oracle and make data correlations between both databases.