How to fix the error ORA-00750: database has been previously mounted and dismounted?

In this post, you’ll learn more about the Oracle ErrorORA-00750: database has been previously mounted and dismounted with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-00750: database has been previously mounted and dismounted

Reason for the Error ORA-00750: database has been previously mounted and dismounted

The instance has already mounted and dismounted the database, which is only allowed once in its lifetime.

How to fix the Error ORA-00750: database has been previously mounted and dismounted ?

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

Shut down the database.