Oracle : Ошибка ORA-00286

"no members available, or no member contains valid data"
*Cause: None of the members of a redo log file group are available, or
the available members do not contain complete data.
*Action: If a member is temporarily offline, attempt to make it available.
Make sure that the correct filenames are being used, especially
if the redo log file is being accessed from a remote location.

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