在大多数情况下，不希望完全缓存那些经常更新的数据。
Most of the time, you wouldn't want to completely cache data that is being updated constantly.
当所有行处理完成之后，将完全更新缓存，并且所有相关的赋值操作符都对齐到一个合适的列。
Once all the lines have been processed, the buffer will have been completely updated and all the relevant assignment operators aligned to a suitable column.
当缓存完全失效时，所有用户请求被发送到数据库服务器进行处理。
As the cache is completely invalidated, all customer requests are sent to the database server for processing.
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