Oracle : Ошибка ORA-01624

"log %s needed for crash recovery of instance %s (thread %s)"
*Cause: A log cannot be dropped or cleared until the thread's checkpoint
has advanced out of the log.
*Action: If the database is not open, then open it. Crash recovery will
advance the checkpoint. If the database is open force a global
checkpoint. If the log is corrupted so that the database cannot
be opened, it may be necessary to do incomplete recovery until
cancel at this log.

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