Oracle : Ошибка ORA-01150

"cannot prevent writes - file %s has online backup set"
*Cause: An attempt to make a tablespace read only or offline normal found
that an online backup is still in progress. It will be necessary
to write the file header to end the backup, but that would not
be allowed if this command succeeded.
*Action: End the backup of the offending tablespace and retry this command.

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