User id and password are optional, and you can provide them at the time of connection.

用户ID和密码是可选的，您可以在连接的时候提供它们。

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GZIP is most useful in the case of a slow network connection in which the transmission of data consumes a significant portion of the time a user waits for the page to be displayed.

GZIP在网络连接慢的情况下最有用，在这种情况下，数据传输耗用了用户等待将显示的页面所花费的大部分时间。

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At execution time, the user application code page is established when a database connection is made, and it is in effect for the duration of the connection.

在执行时，当建立数据库连接时，确定用户应用程序代码页，而且它只在连接期间有效。

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