当对一个表运行RUNSTATS时，有两种用户访问选项：允许读访问和允许写访问。
There are two options for user access to a table while a RUNSTATS is running against that table: allow read access and allow write access.
在执行操作时，读访问将被允许。
当遇到日志写满情况，仍允许对数据库的读访问。
When a log full condition is encountered, read access is still allowed on the database.
被访问的对象、被访问的属性名、访问的类型（例如读、写和删除）将被传递给回调函数，回调函数会返回是否允许访问。
This callback is given the object being accessed, the name of the property being accessed, the type of access (read, write, or delete for example) and returns whether or not to allow access.
Policy——访问资源的规则，比如允许对多维数据集进行读访问，或者拒绝对Retailers维度的美国成员的祖先或后代成员进行读访问。
Policy - a rule for accessing a resource, such as allowing read access to a cube or denying read access to the ascendants and descendants of the U.S. members of the Retailers dimension.
Policy——访问资源的规则，比如允许对多维数据集进行读访问，或者拒绝对Retailers维度的美国成员的祖先或后代成员进行读访问。
Policy - a rule for accessing a resource, such as allowing read access to a cube or denying read access to the ascendants and descendants of the U.S. members of the Retailers dimension.
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