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!
它报告文件系统的所有层的使用率，包括逻辑卷管理器(LVM)、虚拟内存和物理磁盘层。
It reports on all layers of file system utilization, including the Logical Volume Manager (LVM), virtual memory, and physical disk layers.
可以对服务层进行配置，以根据目标环境的功能使用不同的事务管理器。
You can configure your service layer to use different transaction managers depending on the capabilities of the target environment.
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