This method returns a buffer that contains the initial data and the number of bytes transferred.
这个方法会传回包含已传输之初始资料和位元组数的缓冲区。
This is usually expensive since the operator will generally charge by the number of bytes transferred.
这通常开销非常大，因为运营商通常是按照传输的字节数进行收费的。
Bytes transferred remotely indicates bytes transferred between the client and a remote database instance.
远程传输字节数表示客户端与远程数据库实例之间传输的字节数。
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