欢迎来到奇妙的数据映射世界，这里的每条规则都有例外。
Welcome to the marvelous world of data mapping, where every rule has an exception.
因此，路由到外部ODR可以被视为一个例外，用于在数据中心内的所有odr全部故障的情况下保持应用程序高可用性。
Therefore, routing to foreign ODRs could be considered an exception for the purpose of making applications highly available in case all ODRs in a data center fail.
可以想像，开发一个数据库并不简单，Apache Derby数据库也不例外(因为它是个开放源码软件，所以您可以自行查看它)。
As you can imagine, developing a database isn't simple, and the Apache Derby database is no exception (because it's open source software, you can look for yourself).
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