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.
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.
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.
缓冲区缓存之下是设备驱动程序，它实现了特定物理设备的接口。
Below the buffer cache are the device drivers, which implement the interface for the particular physical device.
文件系统驱动程序更新适当的元数据，但是没有时间将其缓存中的数据刷新到磁盘的新块中。
The filesystem driver updated the appropriate metadata, but didn't have time to flush the data from its caches to the new blocks on disk.
注意，可以使用sync命令将缓冲区缓存中的请求发送到存储媒体(迫使所有未写的数据发送到设备驱动程序，进而发送到存储设备)。
Note that you can use the sync command to flush the buffer cache out to the storage media (force all unwritten data out to the device drivers and, subsequently, to the storage device).
注意，可以使用sync命令将缓冲区缓存中的请求发送到存储媒体(迫使所有未写的数据发送到设备驱动程序，进而发送到存储设备)。
Note that you can use the sync command to flush the buffer cache out to the storage media (force all unwritten data out to the device drivers and, subsequently, to the storage device).
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