Oracle : Ошибка ORA-01620

"no public threads are available for mounting"
*Cause: The INIT.ORA parameter "thread" is zero, its default value.
There are no threads which have been publicly enabled, and not
*Action: Shutdown the instance, change the INIT.ORA parameter to a thread
which is privately enabled and not mounted. If the database is
open in another instance, then a thread may be publicly enabled.

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