两种方法的权衡实际就是易用性和控制粒度的权衡。
The key trade-off between the two methods is ease of use versus granularity of control.
访问控制粒度指明系统为用户授权的层次，如目录级授权与文件级授权等。
Access control granularity specifies the authorization level which administrative domain provides service for users, such as directory authorization level, file authorization level etc.
DB 2 9.7 for LUW改进了访问控制粒度，让DBA可以全面控制数据库，而不必访问实际数据。
DB2 9.7 for LUW increases access control granularity, making it possible to give DBAs full control over a database without access to the actual data.
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