例如 專用 其他 模式 情況 需要 com dac 配置

數據庫運維人員，在維護數據庫時，有時會遇到一些特殊的情況，例如，SQL Server實例無法訪問，此時需要用到管理員在緊急情況下專用的連接；有時，在做一些系統級別的配置修改時，當前數據庫不能被其他用戶訪問，必須把數據庫切換

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專用管理連接（DAC）和單用戶模式