How to fix the Oracle error RMAN-05531: a mounted database cannot be duplicated while datafiles are fuzzy?

In this post, you’ll learn more about the Oracle ErrorRMAN-05531: a mounted database cannot be duplicated while datafiles are fuzzy with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

RMAN-05531: a mounted database cannot be duplicated while datafiles are fuzzy

Reason for the Error RMAN-05531: a mounted database cannot be duplicated while datafiles are fuzzy

A DUPLICATE with FROM ACTIVE DATABASE command was specified while the database was mounted or open read-only. Unless the database is open read/write, the datafiles cannot be fuzzy.

How to fix the Error RMAN-05531: a mounted database cannot be duplicated while datafiles are fuzzy ?

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

Open the database read/write, then shutdown cleanly before mounting.