默认情况下，数据库镜像是被禁用的。当前提供的数据库镜像仅供评估使用，并不应使用于生产环境中。若要以评估为目的启用数据库镜像，请在启动过程中使用跟踪标志 1400。有关跟踪标志和启动选项的详细信息，请参阅 SQL Server 联机丛书。

Database mirroring is disabled by default. Database mirroring is currently provided for evaluation purposes only and is not to be used in production environments. To enable database mirroring for evaluation purposes, use trace flag 1400 during startup. For more information about trace flags and startup options, see SQL Server Books Online.