Oracle DB Error ORA-01150 cannot prevent writes - file string has online backup set

The following in the cause of this error:

Tablespace cannot be taken offline or made read-only when online backup is running. Ending the backup entails writing the file header, which this operation, were it permitted, would prevent.

Action you can take to resolve this issue: End the online backup and then take the tablespace offline or make it read-only.

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