You do not have to install anything on your DB, instead follow below approach -
Step 1. Install DB connect app on a Heavy forwarder
Step 2. Create Identities - https://docs.splunk.com/Documentation/DBX/3.2.0/DeployDBX/Createandmanageidentities
Step 3. Create Connections - https://docs.splunk.com/Documentation/DBX/3.2.0/DeployDBX/Createandmanagedatabaseconnections
Step 4. Create inputs - https://docs.splunk.com/Documentation/DBX/3.2.0/DeployDBX/Createandmanagedatabaseinputs
NOTE - You can configure inputs to send your db events to any of the index/sourcetype.
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