文档解释
ORA-31424: change table has active subscriptions
Cause: The change table is subscribed to, so it cannot be dropped.
Action: Do not drop a change table while there are active subscribers. If this is an emergency, use the FORCE parameter. This will forcibly drop the change table out from under all subscribers.
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ORA-31424 错误是由Oracle数据库报告的一个错误。它指出了Change Table中存在活动的订阅，并且可能正在尝试使用单个订阅进行异步修改。
