ORA-24063：cannot downgrade QUEUE_TABLE that has queues with rule-based subscribers
错误码
错误描述：cannot downgrade QUEUE_TABLE that has queues with rule-based subscribers
错误原因：An attempt was made to downgrade the queue table when there were queues on which rule based subscribers are defined.
解决方法：Remove the rule based subscribers for all queues in this queue table and retry.
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