此参数指定在将数据发送给加载驱动程序之前应该缓存多少行。

This parameter specifies how many rows a connector should cache before the data is sent to the load driver.

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例如，对底层设备驱动程序的读写请求会通过缓冲区缓存来传递。

For example, read and write requests to the underlying device drivers migrate through the buffer cache.

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它允许使用64位数据源驱动程序，且可以利用64位满足查询处理、元数据缓存和数据缓存的空间。

It permits the use of 64 bit data source drivers and can leverage the 64 bit address space for query processing, metadata caching and data caching.

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