How to fix the Oracle error ORA-03170: deadlocked on readable physical standby (undo segment string)?

In this post, you’ll learn more about the Oracle ErrorORA-03170: deadlocked on readable physical standby (undo segment string) with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-03170: deadlocked on readable physical standby (undo segment string)

Reason for the Error ORA-03170: deadlocked on readable physical standby (undo segment string)

A new undo segment was added. A query can occasionally deadlock when issued around the time an undo segment is added and used immediately on the primary.

How to fix the Error ORA-03170: deadlocked on readable physical standby (undo segment string) ?

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

Retry the query. Avoid creating new undo segments when using standby as a regular part of operation.