How to fix the Oracle error ORA-04933: initial service identifier is non-zero?

In this post, you’ll learn more about the Oracle ErrorORA-04933: initial service identifier is non-zero with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-04933: initial service identifier is non-zero

Reason for the Error ORA-04933: initial service identifier is non-zero

A valid service identifier existed before the sequence number service was opened.

How to fix the Error ORA-04933: initial service identifier is non-zero ?

You can fix this error in Oracle by following the below steps

Verify that the instance is completely shut down.