除了实际的数据外，DB 2需要维护强制的null指示符(1个字节)和长度信息(4个字节)。
In addition to the actual data, DB2 needs to maintain the mandatory null indicator (1 byte) and length information (4 bytes).
与其建立一个需要强制我们的数据去适应它的数据成熟度模型，不如让我们用数据已经存在的不同的阶段来定义成熟度的路径。
Rather than creating a data maturity model and forcing your data to fit into it, we are letting the various stages the data is already in define the maturity path.
另一个用例是策略的动态检索和强制，这些策略对日志记录、过滤、数据转换或路由方面的交互有效。
Another use case is dynamic retrieval and enforcement of the policies that are in effect for a service interaction in the areas of logging, filtering, data transformation, or routing.
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