使用多个文件、而不是一个超大文件定义外部表；使用PD Q优先集执行加载或选择操作，以便IDS利用“并行性”。
Define external table with multiple files instead of one huge single file; when executing load or select operation with PDQ priority set, IDS exploits the parallelism.
事件驱动异步设计的一个明显优点就是，如果大量等待外部服务的操作之间没有数据依赖关系，则可以并行执行这些操作。
An obvious gain from an asynchronous, event-driven design is that many operations waiting for external services can be executed in parallel as long as no data dependency exists between them.
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