即便在授权用户中，也不是所有用户应该访问服务存取的全部数据。
Even among authorized users, not all users should have access to all data the service has access to.
这儿的问题是现有应用通过实现数据存取和验证逻辑有效控制了企业数据的访问。
The issue here is that existing applications effectively control enterprise data access through implementation of the data access and validation logic.
数据统计信息中的变化会引起对存取方案的选择发生变化，该存取方案作为访问所期望数据的最有效方法。
A change in the data statistics can result in a change in the choice of access plan selected as the most efficient method of accessing the desired data.
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