“Requests 与 Activities之间的关系”？（DB2 v9.7 及其以后版本）

Requests vs Activities

DB2 9.7版本首次推出 MON_GET监视元素体系以后，战略上想与 9.5推出的 WLM工作负载管理统一监视体系。
但是，新推出的监视体系中，新增加了两个很关键的概念 Requests 与 Activities。
关于Requests，有以下三种来源：
A request is a directive to a database agent to perform some work that expends database resources. Sources of the request can include:

1. A directive issued directly by an external application, such as an OPEN or EXECUTE directive. These are referred to as application requests.
2. A directive issued by a coordinator agent to a subagent at the same or a different database member.
3. A directive issued by an agent at a different database member.

而触发 Activities 的有下列语句和命令：

1. 所有 DML 语句
2. 所有 DDL 语句
3. CALL 语句
4. LOAD
   通常，一个 Load 操作会产生多个 Activities，有时一个 CALL调用通常还好产生一系列嵌套的 Activities。

应该用什么层次体系图来描绘 “Requests 与 Activities之间的关系”呢？