USE[master]

    GO

    ALTER DATABASE hr SET RECOVERY SIMPLE WITH NO_WAIT

    GO

    ALTER DATABASE hr SET RECOVERY SIMPLE   --简单模式

    GO

    USE hr

    GO

    DBCC SHRINKFILE (N'hr_Log' , 11, TRUNCATEONLY)

    GO

    USE[master]

    GO

    ALTER DATABASE hr SET RECOVERY FULL WITH NO_WAIT

    GO

    ALTER DATABASE hr SET RECOVERY FULL  --还原为完全模式

    GO