ORA-24063: cannot downgrade QUEUE_TABLE that has queues with rule-based subscribers
Cause: An attempt was made to downgrade the queue table when there were queues on which rule based subscribers are defined.
Action: Remove the rule based subscribers for all queues in this queue table and retry.
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ORA 24063 表示无法使用“downgrade”语句来降级非空队列表。此错误发生时，尝试使用downgrade语句时，队列表中存在基于规则的订阅者。