在连接建立或实例连接中，用户ID和密码是可选的。

During a connection establishment or instance attachment, user IDs and passwords are optional.

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定制的CLP提示符可以显示当前用户、实例连接或数据库连接。

The customized CLP prompt can show the current user, instance attachment, or database connection.

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当Derby实例连接到一个数据库时，就会创建一个锁，以帮助强制实施这些规则。

When the Derby instance connects to a database, a lock is created that helps to enforce these rules.

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