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

Oracle Error Message

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

Reason for the Error

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.

Solution

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

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