How to fix the Oracle error ORA-42026: duplicated rows detected while instantiating the redefinition?

In this post, you’ll learn more about the Oracle ErrorORA-42026: duplicated rows detected while instantiating the redefinition with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

ORA-42026: duplicated rows detected while instantiating the redefinition

Reason for the Error ORA-42026: duplicated rows detected while instantiating the redefinition

Duplicated rows are detected during instantiation of the redefinition.

How to fix the Error ORA-42026: duplicated rows detected while instantiating the redefinition ?

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

Abort the redefinition, turn off the optimistic ascending SCN optimization, and restart the redefinition.