T-SQL Tuesday #26 – Segundas Chances

Todo mundo merece uma segunda chance,, ou para fazer melhor, ou para simplesmente não fazer,,, então,,, até no SQL temos uma segunda chance…

Dessa vez o Sr. David Howard (Blog | Twitter) deu a oportunidade de escrevermos novamente sobre algum tópico anterior do T-SQL Tuesday, ou para melhora-lo ou para fazer um se você não participou…

Eu resolvi melhorar o meu script para montar um Mirror com SQLCMD,,, na versão anterior (#25) se o banco de dados tiver mais que um datafile você tem que modificar o script na mão e compensar a criação desse outro arquivo… Nesta versão o script vai ler o arquivo de backup em uma temp table e montar o script de restore com todas as variáveis…

Vale lembrar que você precisa habilitar a opção de SQLCMD no SSMS e não esqueça de trocar o caminho do backup…

Everyone deserves a second chance, or to do better or to simply not do, then, even in SQL havea second chance…
This time Mr. David Howard (blog | twitter) gave us the opportunity to write again about a previous topic of Tuesday’s T-SQL, or to improve it or make one if you did not participate …
I decided to improve my script to create a Mirror with SQLCMD, in the previous version (#25) if the database has more than one datafile you have to modify the script and make the creation of another file … this version will read backup file in a temp table and mount the restore script with all the variables …
Remember that you need to enable the option of SQLCMD in SSMS and do not forget to change the backup path …

:SETVAR PrincipalServer (local)\INST01
:SETVAR MirrorServer (local)\INST02
:SETVAR SERVER (servername)
:SETVAR db DB_NAME
go

:ON ERROR EXIT
go

:CONNECT $(PrincipalServer)

ALTER DATABASE $(db)
 SET RECOVERY FULL
go

CREATE ENDPOINT Mirroring
 STATE=STARTED
 AS TCP (LISTENER_PORT=5091)
 FOR DATABASE_MIRRORING (ROLE=ALL)
GO

:CONNECT $(MirrorServer)

CREATE ENDPOINT Mirroring
 STATE=STARTED
 AS TCP (LISTENER_PORT=5092)
 FOR DATABASE_MIRRORING (ROLE=ALL)
GO

:CONNECT $(PrincipalServer)

BACKUP DATABASE $(db)
TO DISK = 'D:\DB01\local\$(db).bak'
WITH INIT
GO

:CONNECT $(MirrorServer)

DECLARE @InstanceName sql_variant,
 @InstanceDir sql_variant,
 @SQLDataRoot nvarchar(512),
 @ExecStr nvarchar(max)

SELECT @InstanceName = ISNULL(SERVERPROPERTY('InstanceName'), 'MSSQLServer')

EXECUTE master.dbo.xp_regread 'HKEY_LOCAL_MACHINE',
 'SOFTWARE\Microsoft\Microsoft SQL Server\Instance Names\SQL',
 @InstanceName, @InstanceDir OUTPUT

SELECT @ExecStr = 'EXECUTE master.dbo.xp_regread '
 + '''HKEY_LOCAL_MACHINE'', '
 + '''SOFTWARE\Microsoft\Microsoft SQL Server\'
 + convert(varchar, @InstanceDir)
 + '\Setup'', ''SQLDataRoot'', @SQLDataRoot OUTPUT'

EXEC master.dbo.sp_executesql @ExecStr
 , N'@SQLDataRoot nvarchar(512) OUTPUT'
 , @SQLDataRoot OUTPUT

IF @SQLDataRoot IS NULL
BEGIN
 RAISERROR ('I can´t find where restore the Database... I going to stop...', 16, -1)
END

CREATE TABLE #BackupFileList
( LogicalName sysname NULL
 , PhysicalName sysname NULL
 , [Type] char(1)
 , FileGroupName sysname NULL
 , Size bigint
 , MaxSize bigint
 , FileId smallint
 , CreateLSN numeric(25,0)
 , DropLSN numeric(25,0)
 , UniqueId uniqueidentifier
 , ReadOnlyLSN numeric(25,0)
 , ReadWriteLSN numeric(25,0)
 , BackupSizeInBytes bigint
 , SourceBlockSize bigint
 , FileGroupId smallint
 , LogGroupGUID uniqueidentifier
 , DifferentialBaseLSN numeric(25,0)
 , DifferentialBaseGUID uniqueidentifier
 , IsReadOnly bit
 , IsPresent bit
 , TDEThumbPrint varbinary(32)
)

INSERT #BackupFileList
 EXEC('RESTORE FILELISTONLY FROM DISK = ''D:\DB01\local\$(db).bak''')

UPDATE #BackupFileList
 SET PhysicalName
 = @SQLDataRoot
 + N'\Data\'
 + REVERSE(SUBSTRING(REVERSE(PhysicalName)
 , 1, PATINDEX('%\%', REVERSE(PhysicalName)) -1))

DECLARE @LogicalName sysname
 , @PhysicalName sysname

DECLARE FileListCursor CURSOR FAST_FORWARD FOR
 SELECT LogicalName, PhysicalName
 FROM #BackupFileList

OPEN FileListCursor

FETCH NEXT FROM FileListCursor INTO @LogicalName, @PhysicalName

SELECT @ExecStr = N'RESTORE DATABASE $(db)' +
 N' FROM DISK = ''D:\DB01\local\$(db).bak''' +
 N' WITH MOVE ''' + @LogicalName + N''' TO ''' + @PhysicalName + N''''

FETCH NEXT FROM FileListCursor INTO @LogicalName, @PhysicalName

WHILE @@FETCH_STATUS <> -1
BEGIN
 SELECT @ExecStr = @ExecStr + N', MOVE ''' + @LogicalName
 + ''' TO ''' + @PhysicalName + ''''
 FETCH NEXT FROM FileListCursor INTO @LogicalName, @PhysicalName
END

SELECT @ExecStr = @ExecStr + N' , NORECOVERY, REPLACE'

-- if you receive the error message because the script don´t found where he need to restore, you can uncomment the next line and get the restore command,,,
-- to restore manual...
-- SELECT @ExecStr

EXEC (@ExecStr)

DEALLOCATE FileListCursor
GO

:CONNECT $(PrincipalServer)
SELECT DATABASEPROPERTYEX(N'$(db)', N'Status') AS 'Principal Database State' -- Returns ONLINE
SELECT db_name(sd.[database_id]) AS [Database Name],
 sd.mirroring_guid,
 sd.mirroring_state,
 sd.mirroring_state_desc,
 sd.mirroring_partner_name,
 sd.mirroring_witness_name,
 sd.mirroring_witness_state,
 sd.mirroring_witness_state_desc,
 sd.mirroring_role,
 sd.mirroring_role_desc,
 sd.mirroring_role_sequence,
 sd.mirroring_safety_level,
 sd.mirroring_safety_level_desc,
 sd.mirroring_safety_sequence,
 sd.mirroring_failover_lsn
FROM sys.database_mirroring AS sd
WHERE sd.[database_id] = db_id(N'$(db)')
go

:CONNECT $(MirrorServer)
SELECT DATABASEPROPERTYEX(N'$(db)', N'Status') AS 'Mirror Database State' -- Returns RESTORING
SELECT db_name(sd.[database_id]) AS [Database Name],
 sd.mirroring_guid,
 sd.mirroring_state,
 sd.mirroring_state_desc,
 sd.mirroring_partner_name,
 sd.mirroring_witness_name,
 sd.mirroring_witness_state,
 sd.mirroring_witness_state_desc,
 sd.mirroring_role,
 sd.mirroring_role_desc,
 sd.mirroring_role_sequence,
 sd.mirroring_safety_level,
 sd.mirroring_safety_level_desc,
 sd.mirroring_safety_sequence,
 sd.mirroring_failover_lsn
FROM sys.database_mirroring AS sd
WHERE sd.[database_id] = db_id(N'$(db)')
go

:CONNECT $(PrincipalServer)

BACKUP LOG $(db)
TO DISK = 'D:\DB01\local\$(db)_Log.bak'
WITH INIT
GO

:CONNECT $(MirrorServer)

RESTORE LOG $(db)
FROM DISK = 'D:\DB01\local\$(db)_Log.bak'
WITH NORECOVERY
GO

ALTER DATABASE $(db)
 SET PARTNER = 'TCP://$(server):5091'
GO

:CONNECT $(PrincipalServer)

ALTER DATABASE $(db)
 SET PARTNER = 'TCP://$(server):5092'
GO

SELECT db_name(sd.[database_id]) AS [Database Name],
 sd.mirroring_guid,
 sd.mirroring_state,
 sd.mirroring_state_desc,
 sd.mirroring_partner_name,
 sd.mirroring_witness_name,
 sd.mirroring_witness_state,
 sd.mirroring_witness_state_desc,
 sd.mirroring_role,
 sd.mirroring_role_desc,
 sd.mirroring_role_sequence,
 sd.mirroring_safety_level,
 sd.mirroring_safety_level_desc,
 sd.mirroring_safety_sequence,
 sd.mirroring_failover_lsn
FROM sys.database_mirroring AS sd
WHERE sd.[database_id] = db_id(N'$(db)')
GO