Oracle : Ошибка ORA-01640

"cannot make tablespace read-only with changes by in-doubt transactions"
*Cause: An attempt was made to alter a tablespace read-only while there were
changes in the tablespace made by in-doubt distributed transactions.
The in-doubt transactions must commit or rollback to ensure that
there is no undo for a tablespace before it can be made read-only.
*Action: Any in-doubt transactions that made changes to the tablespace must
be resolved.

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