-25009: Failure in db communication (<type>): <return_code> = <error_text> 

Explanation:

Communication between the Loader and the database instance takes place through the synchronous exchange of communication packages. Here, the Loader sends the database instance a package with the command that has to be processed to. This is known as a Request. While the database instance processes the command, the Loader waits for the package of the database instance to be returned with the result. This is known as a Receive.

Errors may occur during this process if the connection from the Loader to the database instance is lost or if the database instance is no longer available.

User Response:

Use the error text to determine why the communication failed. Fix the cause or the error and restart the Loader.