How to fix the Oracle error ORA-01155: the database is being opened, closed, mounted or dismounted?

In this post, you’ll learn more about the Oracle ErrorORA-01155: the database is being opened, closed, mounted or dismounted with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-01155: the database is being opened, closed, mounted or dismounted

Reason for the Error ORA-01155: the database is being opened, closed, mounted or dismounted

The requested operation needs the instance to be in a particular state but the state is being changed.

How to fix the Error ORA-01155: the database is being opened, closed, mounted or dismounted ?

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

Wait for the open, close, mount, or dismount to complete then retry the operation. If necessary, a SHUTDOWN ABORT will always work.