此外，在Session bean中执行所有CMP操作使得Web应用程序无需知道数据库访问层的任何实现细节。
Also, performing all CMP operations in a session bean shields the Web application from having to know any of the implementation details of the database access layer.
系统使用五层体系结构，分别为：用户交互层，系统编程接口层，挖掘核心服务层，数据库访问层，数据库。
The system structure is a multilayer system structure with five layers. They are user interactive layer, system program interface layer, mining core service layer, data access layer, database layer.
如果对源数据库的访问不可靠，在缓存层争取弹性可能会提高读密集型应用程序的总体稳定性。
If access to the source database is unreliable, striving for resiliency in the cache layer might improve overall stability for read-intensive applications.
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