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create procedure sys.sp_can_tlog_be_applied
    @backup_file_name nvarchar(500)
    ,@database_name sysname
    ,@result bit = 0 output
    ,@verbose bit = 0
    set nocount on
    declare @retcode int
            ,@command nvarchar(1000)
            ,@backup_type int
            ,@backupdbname sysname
            ,@backup_first_lsn numeric(25,0)
            ,@backup_last_lsn numeric(25,0)
            ,@db_redo_start_lsn numeric(25,0)
    declare @backup_header table (
            BackupName             nvarchar(128)  NULL,
            BackupDescription      nvarchar(256)  NULL,
            BackupType             int,
            ExpirationDate         datetime NULL,
            Compressed             int,
            Position               int,
            DeviceType             int,
            UserName               nvarchar(128) NULL,
            ServerName             nvarchar(128),
            DatabaseName           nvarchar(128),
            DatabaseVersion        int,
            DatabaseCreationDate   datetime,
            BackupSize             numeric(20,0) NULL,
            FirstLsn               numeric(25,0) NULL,
            LastLsn                numeric(25,0) NULL,
            CheckpointLsn          numeric(25,0) NULL,
            DatabaseBackupLsn      numeric(25,0) NULL,
            BackupStartDate        datetime,
            BackupFinishDate       datetime,
            SortOrder              int,
            CodePage               int,
            UnicodeLocaleId        int,
            UnicodeComparisonStyle int,
            CompatibilityLevel     int,
            SoftwareVendorId       int,
            SoftwareVersionMajor   int,
            SoftwareVersionMinor   int,
            SoftwareVersionBuild   int,
            MachineName            nvarchar(128),
            Flags                  int NULL,
            BindingId              uniqueidentifier NULL,
            RecoveryForkId         uniqueidentifier NULL,
            Collation              nvarchar(128) null,
            FamilyGUID uniqueidentifier null,
            HasBulkLoggedData bit null,
            IsSnapshot bit null,
            IsReadOnly bit null,
            IsSingleUser bit null,
            HasBackupChecksums bit null,
            IsDamaged bit null,
            BeginsLogChain bit null,
            HasIncompleteMetadata bit null,
            IsForceOffline bit null,
            IsCopyOnly bit null,
            FirstRecoveryForkID uniqueidentifier null,
            ForkPointLSN numeric(25,0) null,
            RecoveryModel nvarchar(60) null,
            DifferentialBaseLSN numeric(25,0) null,
            DifferentialBaseGUID uniqueidentifier null,
            BackupTypeDescription nvarchar(60) null,
            BackupSetGUID uniqueidentifier null,
            CompressedBackupSize numeric(20,0) null)

    -- security check
    exec @retcode = sys.sp_MSlogshippingsysadmincheck
    if (@retcode != 0 or @@error != 0)
        return 1
    -- initialize
    select @result = 0
    -- get the backup information
    select @command = N'restore headeronly from disk = N''' + replace(@backup_file_name, N'''',N'''''') + N''''
    insert into @backup_header
    if (@@error != 0)
        return 1
    -- get the redo start lsn for the database
    -- choose the smallest value from all of the files of the database being restored
    -- State 0 is "online", so this handles page restore, or cases where the "restoring" state isn't marked properly.
    -- State 1 is "restoring", which is the expected state.
    -- redo_start_lsn is null for files which are not subject to restore.
    select @db_redo_start_lsn = min(redo_start_lsn)
    from master.sys.master_files
    where database_id = db_id (@database_name)
        and type = 0
        and state in (0,1)
        and redo_start_lsn is not null

    if (@db_redo_start_lsn is null)
        -- the log can not be restored
        return 0
    end  -- if (@db_redo_start_lsn is null)

    if (@verbose = 1)
        raiserror('The redo start LSN for the database is:', 10, 1)
        select @db_redo_start_lsn
    -- Get the first LSN from backup header
    -- Will need the other info for old method
    select top 1 @backupdbname = DatabaseName
                    ,@backup_first_lsn = ISNULL(FirstLsn, 0)
                    ,@backup_last_lsn = ISNULL(LastLsn, 0)
                    ,@backup_type = BackupType
    from @backup_header
    if (@verbose = 1)
        raiserror(N'The backup details (FirstLSN, LastLSN, BackupType, DatabaseName) :', 10, 1)
        select @backup_first_lsn, @backup_last_lsn, @backup_type, @backupdbname
    -- Basic sanity checks
    if (@backupdbname != @database_name)
        raiserror(14418,10,1, @database_name)
    if (@backup_type not in (1,2))
        return (1) -- Failure
    -- We can apply the backup if the
    -- backup_first_lsn <= db_redo_start_lsn < backup_last_lsn
    -- In strict sense - we can apply the backup if db_redo_start_lsn
    -- is equal to backup_last_lsn, however no pages will be restored
    -- The aim is to pick one log file that will satisfy the criterion for
    -- applying restore
    if (@db_redo_start_lsn >= @backup_first_lsn and @db_redo_start_lsn < @backup_last_lsn)
        select @result = 1
    -- all done
    return 0

Last revision 2008RTM

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