In this post, you’ll learn more about the Oracle ErrorORA-00042: Unknown Service name string with the details on why you receive this error and the possible solution to fix it.
Oracle Error Description
ORA-00042: Unknown Service name string
Reason for the Error ORA-00042: Unknown Service name string
An attempt was made to use an invalid application service.
How to fix the Error ORA-00042: Unknown Service name string ?
You can fix this error in Oracle by following the below steps
Use a valid service name from SERVICE$ or add a new service using the DBMS_SERVICE package.