尽管有了管理连接池的资源管理器，但是还不能保证ejb层具有最优性能——还有一些设计考虑事项！
The fact that you have resource managers that manage your connection pools does not guarantee optimum performance from the EJB layer — there are some design considerations as well!
DB 2具有一种非常成熟的资源管理逻辑，往往不用进行精心的设计就能产生非常好的性能。
DB2 has sophisticated resource-management logic, which standardly produces very good performance without elaborate design.
下面是一些设计考虑因素，可以使您的事务管理器灵活应对资源管理器故障。
Here are some design considerations to help you make your transaction manager resilient to resource manager failures.
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