SQL Server 2016 Shrink During Migration - sql-server

Question

enter image description hereWe have DWH server working on SQL Server 2016 which we planning to move another server.
But we have some databases which is about 2T but this databases in real size about 400G i mean if i will shrink these database they will be about 400G.
As you know DWH servers always has a drop and create objects.
I am searching about shrink when backup and restore to new server but i don't see for Ms SQL SERVER. Is there any way to migrate to new server with real size databases ?

Answer 1

You Can Shrink The Database Before Taking Backup.
DECLARE #string NVARCHAR(4000),
#Strt INT ,
#END INT ,
#DBName NVARCHAR(255),
#Log_Size DECIMAL(18,5),
#Log_Name NVARCHAR(25),
#String_sql NVARCHAR(MAX)
CREATE TABLE #t (srno INT IDENTITY(1,1),filename NVARCHAR(255),DBNAME NVARCHAR(50))
CREATE TABLE #Tmp_logfile (fileName NVARCHAR(25),file_size DECIMAL(12,5),log_Name NVARCHAR(25))
-- file_id =2 Log File & file_id =1 MDf File NAme
INSERT INTO #Tmp_logfile (fileName,file_size,log_Name)
SELECT a.NAME , CONVERT(DECIMAL(12,5),ROUND(b.size/128.000,5)),b.name
FROM SYS.DATABASES a
INNER JOIN SYS.MASTER_FILES b ON a.database_id=b.database_id
WHERE a.database_id > 4 AND b.file_id =2
INSERT INTO #t
SELECT
'USE [' + d.name + N']' + CHAR(13) + CHAR(10)
+ 'DBCC SHRINKFILE (N''' + mf.name + N''' , 20)'
+ CHAR(13) + CHAR(10) + CHAR(13) + CHAR(10) as fileName,d.name
FROM
sys.master_files mf
JOIN sys.databases d
ON mf.database_id = d.database_id
WHERE d.database_id > 4 AND mf.file_id=2;
SET #Strt=1
SELECT #END= Max(Srno)FROM #t
EXEC sp_msforeachdb '
IF ''?'' not in (''master'',''model'',''msdb'',''tempdb'')
begin
exec (''ALTER DATABASE [?] SET RECOVERY SIMPLE;'')
print ''?''
end'
While #Strt<=#END
BEGIN
SELECT #string= FileName,#DBName= DBNAME FROM #t WHERE srno= #Strt
SELECT #Log_Size= file_size FROM #Tmp_logfile WHERE fileName= #DBName
IF #Log_Size > 5000 BEGIN -- Limit The Log Size After which Log file to be Shrink for EG I Had Select 5 GB
PRINT (#string)
EXECUTE (#string)
END
SET #Strt=#Strt+1
END ---- SHRINKING Log File END Here
EXEC sp_msforeachdb '
IF ''?'' not in (''master'',''model'',''msdb'',''tempdb'')
begin
exec (''ALTER DATABASE [?] SET RECOVERY FULL;'')
print ''?''
end'
DROP TABLE #t
DROP TABLE #Tmp_logfile