Oracle : Ошибка ORA-30015

"previously offlined undo tablespace '%s' is still pending"
*Cause: the current operation is not allowed because an undo
tablespace containing active transactions is pending
from a previous SWITCH UNDO operation. The operation
will be allowed again after all transactions in the
previous undo tablespace are committed.
*Action: Wait for all previous transactions to commit before
reissuing the current statement.

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