总之，种种约束限制了关系数据库系统的灵活性，并因此限制了系统用户在数据库内部实现复杂、交互式模型的能力。
Overall, these restrictions limit the flexibility of relational database systems and, thus, the ability of users of such systems to implement complex, interactive models within the database itself.
另一方面，对象领域模型还有自己的局限，特别在SOA环境中更是如此；在SOA环境中，跨越多个层次和系统的灵活性和解决方案是最为重要的。
On the other hand, the object domain model also has its limit, particularly in SOA environments, where flexibility and solutions spanning multiple layers and systems are of Paramount importance.
该进程模型使得在 z/OS 环境中有更大的灵活性和集成度，并保持 z/OS 系统操作员所熟悉的服务器界面。
The process model allows a great deal of flexibility and integration with the z/OS environment and maintains the server interface familiar to the z/OS system operator.
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