测试网站只在很短的一段时间内（遵循每个部分无效的事件）遭遇数据库 I/O 瓶颈，但是很快就恢复了。

The test site is bottlenecked on database I/O for short periods of time following each partial invalidation event, but recovers quickly.

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通知可用于无效的缓存对象，或者在对象被添加、替换以及移除时指定事件处理器。

Notifications can be used to invalidate cached objects or to specify event handlers when objects are added to, replaced, or removed from the cache. Performance improvements.

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对一个已经设置为有信号状态的事件对象再次执行该函数是无效的。

Setting an already-set event object has no effect .

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