After running a backup of the content store, Cognos Connection returns the error message "XQE-DAT-0001" when the user attempts to open a report in report studio.
"XQE-DAT-0001 - Data Source Adapter Error: Invalid operation: Connection is closed. ERRORCODE = -4470, SQLSTATE =08003"
When backing up the content store, the database used by the content store was put into offline mode, which disconnects Cognos from the database. The offline mode was set as a user requirement. Cognos does not automatically reconnect to the database.
Content store on DB2
Resolving The Problem
Restart Cognos Service
15 June 2018