应该每月回顾数据，并应该在系统中锁定任何在过去 90 天里不活动的用户 —— 一个帮助保护未用的帐户不被访问的策略。
The data should be reviewed monthly, and any user who was not active in the past 90 days should be locked out of the system--a policy that helps prevent unused accounts from being accessible.
Activity Trends提供了信息，比如用户访问服务器的最近时间，可以用于跟踪不活动的帐户(参见图14)。
Activity Trends provide information, such as the last time a user accessed the server, that you can use to keep track of accounts that are inactive (see figure 14).
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