The DBLINK is the database link which is used for the DWH database to connect to the Clarity database and get the data across via the Load DWH jobs.
If the link is not created or is not valid, the Load Data Warehouse job, the Load Data Warehouse Access Rights jobs will not work
Follow the below steps to recreate the DBLINK for any possible reasons including, but not limited to:
Release : Any
Component : CLARITY DATA WAREHOUSE