Oracle : Ошибка ORA-23500


"cannot switch master for a multi-tier materialized view repgroup \"%s\".\"%s\""
*Cause: An attempt was made to switch master for a materialized view
repgroup when its parent repgroup is also a materialized view
repgroup. This is not allowed.
*Action: Drop and recreate the materialized view repgroup based on
a proper parent repgroup.

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