If the QALIAS names a topic as its target (rather than a queue), then the user opening the QALIAS must have access to not only the alias queue, but also the topic.
如果QALIAS将一个主题(而不是一个队列)命名为其目标，则打开QALIAS的用户不仅需要拥有别名队列的访问权，还需要拥有对主题的访问权。
When the QALIAS is defined, there is no resource security check for the target of the alias.
一旦定义QALIAS，就不会对别名的目标进行任何资源安全性检查。
In other words, if you do not mind giving the alias PPMT_DB on the target server for the source PPMT_DB database, then you do not need to create a local alias on the source server.
换而言之，如果不想在目标服务器上为源ppmt_db数据库提供别名ppmt_db，就不必在源服务器上创建本地别名。
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