The enhanced Oracle Enterprise Manager HTML interface provides a central point of access to all database performance-related statistics and facilitates complete monitoring and diagnostics.
The Manager Bean then handles the logic for retrieving and updating entities by calling the appropriate JPA APIs to interface with the backend database (Figure 3).
然后 Manager Bean 处理逻辑，通过访问合适的 JPA API 来与备份数据库相接（图 3），来检索以及更新实体。