This prevents any 2pc distributed transaction to span across more than one RAC node, thereby avoiding the transaction recovery problem.
这可防止任何2pc分布式事务跨多个RAC节点分布，因而可避免出现事务恢复问题。
2
If all connections in a global 2pc transaction originate from the same Oracle rac node, transaction recovery problems should not arise.
如果一个全局2pc事务中的所有连接都源自同一oracle rac节点，就不会出现事务恢复问题。
3
The third node (Node3) in this topology consists of the disaster recovery site existing in a remote location and hosting the standby database for the primary database mentioned earlier.