鏡像資料庫 "%1" 沒有足夠的交易記錄資料，來保留主體資料庫的記錄備份鏈結。如果主體資料庫的記錄備份未被採用，或尚未在鏡像資料庫上還原，就可能會發生此問題。

The mirror database, "%1", has insufficient transaction log data to preserve the log backup chain of the principal database. This may happen if a log backup from the principal database has not been taken or has not been restored on the mirror database.