本地传输字节数表示客户端与本地数据库实例之间传输的字节数。
Bytes transferred locally refers to the number of bytes transferred between the client and a local 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。
Bytes transferred remotely indicates bytes transferred between the client and a remote database instance.
res是IO操作的通常结果：传输的字节数，或者负值的错误码。
res is the usual result of an I/O operation: the number of bytes transfered, or a negative error code.
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