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Archive for January, 2014

Stored Procedure for Querying the Default Trace Using fn_trace_gettable

January 30, 2014 Leave a comment

This morning I needed to query the default trace using fn_trace_gettable. fn_trace_gettable is a table-based function that returns the contents of a SQL trace file you pass to it. Like any table-based function, you SELECT from the function like you would a table and can include a column list and WHERE predicates. Here is an sample query:

SELECT * FROM fn_trace_gettable('C:\filepath\yourtracefile.trc', DEFAULT)

The DEFAULT parameter following the file name will read all existing rollover files, in addition to the file specified. I created stored procedure sp_QueryTraceFiles to return the columns I was interested in while dynamically building the WHERE predicates based on parameters passed in. See the comments for more information.

USE master
GO
-- =============================================
-- Created By: Frank Gill - skreebydba.com
-- Date: 2014-01-30
-- Purpose: To select rows from the default trace
-- Disclaimer: The author takes no responsibility if your production system 
-- descends into a smoking hole after running this proc.  
-- Like all code on the internet, run in test before running in prod.
-- Sample Execution:
-- EXEC dbo.sp_QueryTraceFiles
--	@starttime =		'2014-01-30 12:01:59', 
--	@servername =		'YourServer',
--	@databasename =		'YourDatabase',
--	@loginname =		'YourLogin',
--	@applicationname =	'YourApplication',
--	@textdata =			'YourText',
--	@objectname =		'YourObject'
-- =============================================

-- Drop stored procedure if it already exists
IF EXISTS (
  SELECT * 
    FROM INFORMATION_SCHEMA.ROUTINES 
   WHERE SPECIFIC_SCHEMA = N'dbo'
     AND SPECIFIC_NAME = N'sp_QueryTraceFiles' 
)
   DROP PROCEDURE dbo.sp_QueryTraceFiles
GO

CREATE PROCEDURE dbo.sp_QueryTraceFiles
	@starttime DATETIME = NULL,				-- Procedure will return trace rows with a StartTime > @startime
	@servername SYSNAME = NULL,				-- Procedure will return trace rows executed from server = @servername
	@databasename SYSNAME = NULL,			-- Procedure will return trace rows executed against database = @databasename
	@loginname SYSNAME = NULL,				-- Procedure will return trace rows executed by login = @loginname
	@applicationname VARCHAR(255) = NULL,	-- Procedure will return trace rows executed by ApplicationName LIKE @applicationname
	@textdata VARCHAR(1000) = NULL,			-- Procedure will return trace rows with TextData LIKE @textdata
	@objectname SYSNAME = NULL,				-- Procedure will return trace rows executed against object = @objectname
	@noexec BIT = 0							-- @noexec = 1 will print the dynamic SQL statement instead of executing it
AS

-- Drop temp table if it exists
IF EXISTS(SELECT 1 FROM tempdb.sys.objects WHERE name LIKE '%#traceinfo%')
BEGIN
	
	DROP TABLE #traceinfo
	
END

-- Declare local variables
DECLARE @tracefile VARCHAR(1000)
DECLARE @sqlstr VARCHAR(2000)
DECLARE @wherebit BIT = 0

-- Select fn_trace_getinfo into temp table #traceinfo to get the default trace file location and name
-- traceid = 1 returns the default trace
SELECT * INTO #traceinfo FROM fn_trace_getinfo(NULL)
WHERE traceid = 1

-- Select default trace file name and location into variable for use in query
-- property = 2 is the trace file name
SELECT @tracefile = CAST(value AS VARCHAR(1000)) FROM #traceinfo
WHERE property = 2

-- Build dynamic SQL string without WHERE predicates to return information from the default trace files using fn_trace_gettable
-- The DEFAULT parm will read all existing rollover files
-- Join to sys.trace_events to return the trace event name
SELECT @sqlstr = 'SELECT trc.SPID AS [Process ID], 
trc.StartTime AS [Start Time], 
trc.ServerName AS [Server Name], 
trc.DatabaseName AS [Database Name], 
trc.LoginName AS [Login Name], 
trc.ApplicationName AS [Application Name],
trc.TextData AS [Text Data],
trc.ObjectName AS [Object Name],
evt.name AS [Event Name] 
FROM fn_trace_gettable(' + '''' + @tracefile + '''' + ', DEFAULT) trc
INNER JOIN sys.trace_events evt
ON trc.EventClass = evt.trace_event_id'

-- Append WHERE predicates if parameters are passed in
IF @starttime IS NOT NULL
BEGIN

	SET @wherebit = 1
	SET @sqlstr = @sqlstr + ' WHERE trc.StartTime > ' + '''' + CAST(@starttime AS VARCHAR(30)) + ''''
	
END

IF @servername IS NOT NULL
BEGIN

	IF @wherebit = 0
	BEGIN
		
		SET @wherebit = 1	
		SET @sqlstr = @sqlstr + ' WHERE trc.ServerName = ' + '''' + @servername + ''''
		
	END
	ELSE
	BEGIN
		
		SET @sqlstr = @sqlstr + ' AND trc.ServerName = ' + '''' + @servername + ''''
		
	END
	
END 

IF @loginname IS NOT NULL
BEGIN

	IF @wherebit = 0
	BEGIN
	
		SET @wherebit = 1
		SET @sqlstr = @sqlstr + ' WHERE trc.LoginName = ' + '''' + @loginname + ''''
		
	END
	ELSE
	BEGIN
		
		SET @sqlstr = @sqlstr + ' AND trc.LoginName = ' + '''' + @loginname + ''''
		
	END
	
END

IF @applicationname IS NOT NULL
BEGIN

	IF @wherebit = 0
	BEGIN
		
		SET @wherebit = 1
		SET @sqlstr = @sqlstr + ' WHERE trc.ApplicationName LIKE ' + '''' + '%' + @applicationname + '%' + '''' 
		
	END
	ELSE
	BEGIN
		
		SET @sqlstr = @sqlstr + ' AND trc.ApplicationName LIKE ' + '''' + '%' + @applicationname + '%' + ''''
		
	END
	
END

IF @textdata IS NOT NULL
BEGIN

	IF @wherebit = 0
	BEGIN
		
		SET @wherebit = 1
		SET @sqlstr = @sqlstr + ' WHERE trc.TextData LIKE ' + '''' + '%' + @textdata + '%' + '''' 
		
	END
	ELSE
	BEGIN
		
		SET @sqlstr = @sqlstr + ' AND trc.TextData LIKE ' + '''' + '%' + @textdata + '%' + ''''
		
	END
	
END

IF @objectname IS NOT NULL
BEGIN

	IF @wherebit = 0
	BEGIN
		
		SET @wherebit = 1
		SET @sqlstr = @sqlstr + ' WHERE trc.ObjectName = ' + '''' + @objectname + ''''
		
	END
	ELSE
	BEGIN
		
		SET @sqlstr = @sqlstr + ' AND trc.ObjectName = ' + '''' + @objectname + ''''
		
	END
	
END

IF @databasename IS NOT NULL
BEGIN

	IF @wherebit = 0
	BEGIN
		
		SET @wherebit = 1
		SET @sqlstr = @sqlstr + ' WHERE trc.DatabaseName = ' + '''' + @databasename + ''''
		
	END
	ELSE
	BEGIN
		
		SET @sqlstr = @sqlstr + ' AND trc.DatabaseName = ' + '''' + @databasename + ''''
		
	END
	
END

-- Append ORDER BY clause to the dynamic SQL string
SET @sqlstr = @sqlstr + ' ORDER BY trc.StartTime DESC'

IF @noexec = 1
BEGIN

	PRINT @sqlstr

END
ELSE
BEGIN

	EXEC(@sqlstr)
	
END
GO
Categories: SQL Server, T-SQL Tags: ,

Stored Procedure to Automate Restores – Mark II

January 13, 2014 Leave a comment

As promised in my last post, I’ve updated the automated restore stored procedure to handle error. There are now custom error messages for a database with no full backup files and for databases that have more than one log file. Additionally, I have added code to handle differential backup files.

Once again, I hope you can put this to use.

UPDATE
I’ve modified the proc to change the physical data and log file names if the @sourcedbname and @restoredbname are different. The previous version worked if the @sourcedbname was contained in the physical file names. 

USE master
GO
-- =============================================
-- Frank Gill - skreebydba.com - 2013-01-12
-- sp_AutomateDatabaseRestores
-- This script is provided with no guarantees
-- Please run in your test environment before deploying to production
-- The author takes no responsibility if your server descends into a smoking hole
-- 2013-01-13 - Updated procedure to append _restoredb to the physical data and 
-- log file if @sourcedbname and @restoredbname are different
-- =============================================
  
-- Drop stored procedure if it already exists
IF EXISTS (
  SELECT * 
    FROM INFORMATION_SCHEMA.ROUTINES 
   WHERE SPECIFIC_SCHEMA = N'dbo'
     AND SPECIFIC_NAME = N'sp_AutomateDatabaseRestores'
)
   DROP PROCEDURE dbo.sp_AutomateDatabaseRestores
GO
  
CREATE PROCEDURE dbo.sp_AutomateDatabaseRestores
    @sourcedbname SYSNAME, 
    @restoredbname SYSNAME,
    @droprestoredb TINYINT = 1,
    @noexec TINYINT = 0
AS
      
SET NOCOUNT ON
 
BEGIN TRY
 
--Drop temp tables if they exist
IF OBJECT_ID('tempdb..#backupfiles') IS NOT NULL
BEGIN
  
    DROP TABLE #backupfiles
      
END
  
IF OBJECT_ID('tempdb..#databasefiles') IS NOT NULL
BEGIN
  
    DROP TABLE #databasefiles
      
END
  
--Create temp tables
CREATE TABLE #backupfiles
(physicalfilename VARCHAR(2000)
,backuptype CHAR(4))
  
CREATE TABLE #databasefiles
(DatabaseName SYSNAME
,LogicalName SYSNAME
,PhysicalName VARCHAR(2000)
,filetype TINYINT)
  
--Declare local variables
DECLARE @filecount SMALLINT
DECLARE @fullfilecount SMALLINT
DECLARE @loopcount SMALLINT
DECLARE @datafileloopcount SMALLINT
DECLARE @backuploopcount SMALLINT
DECLARE @backupfile VARCHAR(2000)
DECLARE @sqlstr VARCHAR(MAX)
DECLARE @backupfiletype CHAR(4)
DECLARE @datafilecount SMALLINT
DECLARE @logfilecount SMALLINT
DECLARE @logbackupcount SMALLINT
DECLARE @diffbackupcount SMALLINT
DECLARE @datafile VARCHAR(2000)
DECLARE @moveparm VARCHAR(2000)
DECLARE @fromstatement VARCHAR(2000)
DECLARE @logfile SYSNAME
DECLARE @physlogfile VARCHAR(2000)
DECLARE @physdatafile VARCHAR(2000)
  
--Drop the restored database if it exists and @droprestoredb = 1
IF EXISTS(SELECT 1 FROM sys.databases WHERE name = @restoredbname) AND @droprestoredb = 1
BEGIN
  
    SET @sqlstr = 'DROP DATABASE ' + @restoredbname
    EXEC (@sqlstr)
      
END
  
--Initialize variables
SET @moveparm = ' WITH'
SET @fromstatement = ' FROM '
SET @loopcount = 1
SET @datafileloopcount = 1
SET @backuploopcount = 1
  
  
--Build dynamic SQL to get a list of data and log files for the source database
SET @sqlstr = 'INSERT INTO #databasefiles SELECT ' + '''' + @sourcedbname + '''' + ' AS DatabaseName, name, physical_name, type 
FROM ' + @sourcedbname + '.sys.database_files'
  
--Execute dynamic SQL to return data and log files for the source database
EXEC (@sqlstr)
  
--Get counts of data files and log files
SELECT @datafilecount = COUNT(*) FROM #databasefiles WHERE filetype = 0
SELECT @logfilecount  = COUNT(*) FROM #databasefiles WHERE filetype = 1
 
IF @logfilecount > 1
BEGIN
 
    RAISERROR ('You have more than one log file, which is a really bad idea.  No backup for you.  See this link for more information.  http://www.sqlskills.com/blogs/paul/multiple-log-files-and-why-theyre-bad/', -- Message text.
    16, -- Severity.
    1 -- State.
    );
     
END
--Get the logical and physical log file names
--If restoring to a different database name, append _restore onto the end of the physical file names
IF @sourcedbname <> @restoredbname
BEGIN

	SELECT @logfile = LogicalName, @physlogfile = REPLACE(PhysicalName,'.ldf','_restore.ldf')
	FROM #databasefiles
	WHERE filetype = 1
	
END
ELSE
BEGIN

	SELECT @logfile = LogicalName, @physlogfile = PhysicalName
	FROM #databasefiles
	WHERE filetype = 1

END
  
--If the database contains one data file, build the MOVE clause for a single file
IF @datafilecount = 1
BEGIN

	IF @sourcedbname <> @restoredbname
	BEGIN
  
		SELECT @datafile = LogicalName, @physdatafile = REPLACE(PhysicalName,'.mdf','_restore.mdf')
		FROM #databasefiles
		WHERE filetype = 0
		
	END
	ELSE
	BEGIN
	
		SELECT @datafile = LogicalName, @physdatafile = PhysicalName
		FROM #databasefiles
		WHERE filetype = 0
	
	END      
    SET @moveparm = @moveparm + ' MOVE ' + '''' + @datafile + '''' + ' TO ' + '''' + @physdatafile + '''' + ',' + ' MOVE ' + '''' + @logfile + '''' + ' TO ' + '''' + @physlogfile + '''' + ', NORECOVERY'
END
ELSE
--If the database contains more than one data file, loop through the list of files and build a multi-file MOVE statement
IF @datafilecount > 1
BEGIN
      
    --SELECT @datafileloopcount, @datafilecount
    WHILE @datafileloopcount <= @datafilecount
    BEGIN
          
        IF @sourcedbname <> @restoredbname
		BEGIN
  
		    SET @physdatafile = (SELECT TOP (1) REPLACE(PhysicalName,'.mdf','_restore.mdf') FROM #databasefiles WHERE filetype = 0)
		    
		END
		ELSE
		BEGIN
		
			SET @physdatafile = (SELECT TOP (1) PhysicalName FROM #databasefiles WHERE filetype = 0)
		
		END
        SET @datafile = (SELECT TOP (1) LogicalName FROM #databasefiles WHERE filetype = 0)     
        SET @moveparm = @moveparm + ' MOVE ' + '''' + @datafile + '''' + ' TO ' + '''' + @physdatafile + '''' + ','
        DELETE TOP (1) FROM #databasefiles WHERE filetype = 0
        SET @datafileloopcount += 1
          
    END
      
    --Append the MOVE command for the log file to the MOVE clause and set it to NORECOVERY
    SET @moveparm = @moveparm + ' MOVE ' + '''' + @logfile + '''' + ' TO ' + '''' + @physlogfile + '''' + ', NORECOVERY'
          
END
  
IF @droprestoredb = 0
BEGIN
  
    SET @moveparm = @moveparm + ', REPLACE'
      
END
  
--Get the most recent full backup file for the source database and insert it into the #backupfiles temp table
INSERT INTO #backupfiles
SELECT
b.physical_device_name, 'FULL' AS [backuptype]
from msdb.dbo.backupset a join msdb.dbo.backupmediafamily b
  on a.media_set_id = b.media_set_id
where a.database_name = @sourcedbname
AND backup_finish_date =
    (SELECT MAX(c.backup_finish_date)
        FROM msdb.dbo.backupset c 
        INNER JOIN msdb.dbo.backupmediafamily d
        ON c.media_set_id = d.media_set_id 
        WHERE c.database_name = @sourcedbname
        AND c.type = 'D')
order by a.backup_finish_date ASC
 
--Get a list of differential backup files older than the most recent full backup
INSERT INTO #backupfiles
SELECT TOP 1
b.physical_device_name, 'DIFF' AS [backuptype]
from msdb.dbo.backupset a join msdb.dbo.backupmediafamily b
  on a.media_set_id = b.media_set_id
where a.database_name = @sourcedbname
AND a.type = 'I'
AND backup_finish_date >
    (SELECT MAX(c.backup_finish_date)
        FROM msdb.dbo.backupset c 
        INNER JOIN msdb.dbo.backupmediafamily d
        ON c.media_set_id = d.media_set_id 
        WHERE c.database_name = @sourcedbname
        AND c.type = 'D')
order by a.backup_finish_date DESC
 
--Get all log backupfiles run after the latest full or differential backup and insert it into the #backupfiles temp table
INSERT INTO #backupfiles
SELECT
b.physical_device_name, 'LOG'  AS [backuptype]
from msdb.dbo.backupset a join msdb.dbo.backupmediafamily b
  on a.media_set_id = b.media_set_id
where a.database_name = @sourcedbname
AND a.type = 'L'
AND backup_finish_date >
    (SELECT MAX(c.backup_start_date)
        FROM msdb.dbo.backupset c 
        INNER JOIN msdb.dbo.backupmediafamily d
        ON c.media_set_id = d.media_set_id 
        WHERE c.database_name = @sourcedbname
        AND c.type IN ('D', 'I'))
order by a.backup_finish_date ASC
 
--Get counts of all backup files, full backup files, differential backup files, and log backup files for use in loop processing below
SELECT @filecount = COUNT(*) FROM #backupfiles
SELECT @fullfilecount = COUNT(*) FROM #backupfiles WHERE backuptype = 'FULL'
SELECT @diffbackupcount = COUNT(*) FROM #backupfiles WHERE backuptype = 'DIFF'
SELECT @logbackupcount = COUNT(*) FROM #backupfiles WHERE backuptype = 'LOG'
 
IF @fullfilecount = 0
BEGIN
 
    RAISERROR ('There are no full backup files for your database.', -- Message text.
    16, -- Severity.
    1 -- State.
    );
 
END
  
--While backup files exists, loop through them to generate the restore statement
WHILE @loopcount <= @filecount
BEGIN
     
    --Get the top backup file from the temp table   
    SET @backupfiletype = (SELECT TOP 1 backuptype FROM #backupfiles)
      
    --If it is a full backup file, build the restore statement
    IF @backupfiletype = 'FULL'
    BEGIN
 
        --If there are no log backups to apply, replace NORECOVERY with RECOVERY in the MOVE clause
        IF (@logbackupcount = 0 AND @diffbackupcount = 0)
        BEGIN
          
            SET @moveparm = REPLACE(@moveparm, 'NORECOVERY', 'RECOVERY')
              
        END
      
        --If there is a single full backup file, build the RESTORE statement with that file
        IF @fullfilecount = 1
        BEGIN
          
            SET @backupfile = (SELECT TOP 1 physicalfilename FROM #backupfiles)
          
            SET @sqlstr = 'RESTORE DATABASE ' + @restoredbname + ' FROM DISK = ' + '''' + @backupfile + '''' + @moveparm
            --PRINT @sqlstr
            DELETE TOP (1) FROM #backupfiles
              
        END
        --If there is more than one full backup file, build the RESTORE command for all full backup files
        ELSE IF @fullfilecount > 1
        BEGIN
              
            WHILE @backuploopcount <= @fullfilecount
            BEGIN
              
                SET @backupfile = (SELECT TOP 1 physicalfilename FROM #backupfiles WHERE backuptype = 'FULL')
                SET @fromstatement = @fromstatement + 'DISK = ' + '''' + @backupfile + '''' + ','
                DELETE TOP (1) FROM #backupfiles WHERE backuptype = 'FULL'
                SET @backuploopcount += 1
              
            END
              
            --Truncate the trailing comma from the FROM clause
            SET @fromstatement = SUBSTRING(@fromstatement,1,(LEN(@fromstatement) - 1))
            SET @sqlstr = 'RESTORE DATABASE ' + @restoredbname + @fromstatement + @moveparm
            SET @loopcount += 1
            --PRINT @sqlstr
              
        END
              
              
    END
        --One RESTORE datement will be built for the most recent differential backup
    ELSE IF @backupfiletype = 'DIFF'
    BEGIN
         
        IF @diffbackupcount = 1 AND @logbackupcount = 0
        BEGIN
         
            SET @moveparm = REPLACE(@moveparm, 'NORECOVERY', 'RECOVERY')
             
        END
      
        SET @backupfile = (SELECT TOP 1 physicalfilename FROM #backupfiles)
  
         
        SET @sqlstr = 'RESTORE DATABASE ' + @restoredbname + ' FROM DISK = ' + '''' + @backupfile + '''' + @moveparm
        --PRINT @sqlstr
        DELETE TOP (1) FROM #backupfiles
          
    END
    --If it is a log backup file, build a RESTORE log statement
    --One RESTORE datement will be built for each log backup file
    ELSE IF @backupfiletype = 'LOG'
    BEGIN
     
        SET @backupfile = (SELECT TOP 1 physicalfilename FROM #backupfiles)
  
        SET @sqlstr = 'RESTORE LOG ' + @restoredbname + ' FROM DISK = ' + '''' + @backupfile + ''''
          
        --If there is another log backup file, set the RESTORE to WITH NORECOVERY
        IF (SELECT COUNT(*) FROM #backupfiles) > 1
        BEGIN
          
            SET @sqlstr = @sqlstr + ' WITH NORECOVERY'
              
        END
        --If there is not another log backup file, set the RESTORE to WITH RECOVERY
        ELSE
        BEGIN
          
            SET @sqlstr = @sqlstr + ' WITH RECOVERY'
          
        END
          
        DELETE TOP (1) FROM #backupfiles
  
      
    END
      
    --If @noexec = 1, PRINT @sqlstr
    IF @noexec = 1
    BEGIN
      
        PRINT @sqlstr
      
    END
    --If @noexec <> 1, EXEC @sqlstr
    ELSE
    BEGIN
      
        EXEC (@sqlstr)
          
    END
      
    --Increment the loop count and continue processing backup files
    SET @loopcount += 1
      
END
  
END TRY
BEGIN CATCH
 
    SELECT
    ERROR_NUMBER() AS ErrorNumber,
    ERROR_SEVERITY() AS ErrorSeverity,
    ERROR_STATE() as ErrorState,
    ERROR_PROCEDURE() as ErrorProcedure,
    ERROR_LINE() as ErrorLine,
    ERROR_MESSAGE() as ErrorMessage;
 
 
END CATCH
  
GO
Categories: Restores, SQL Server, T-SQL Tags: ,

Stored Procedure to Automate Database Restores

January 9, 2014 Leave a comment

It’s been awhile since I’ve posted here, and I’ve already fallen behind on my New Year’s resolution to post once a week. I will do what I can to keep up over the next 51 weeks.

For the past few months, I’ve been working to standardize the backup processes at my current job. Recently, I’ve needed to develop a process to restore a read-only copy of a production database using the most recent full backup file and any subsequent log backup files. The procedure below does that. It will work for database backups containing multiple backup files and databases containing multiple data files. However, if you have more than one log file in your database, you are out of luck. See Paul Randal’s post Multiple Log Files and Why They’re Bad for an excellent explanation of why you shouldn’t do that. I will add error handling to deal with this scenario this weekend.

I hope you can put this to use. Let me know if you have questions.

USE YourDatabaseName
GO
-- =============================================
-- Frank Gill - skreebydba.com
-- sp_AutomateDatabaseRestores
-- This script is provided with no guarantees
-- Please run in you test environment before deploying to production
-- The author takes no responsibility if your server descends into a smoking hole
-- =============================================

-- Drop stored procedure if it already exists
IF EXISTS (
  SELECT * 
    FROM INFORMATION_SCHEMA.ROUTINES 
   WHERE SPECIFIC_SCHEMA = N'dbo'
     AND SPECIFIC_NAME = N'sp_AutomateDatabaseRestores' 
)
   DROP PROCEDURE dbo.sp_AutomateDatabaseRestores
GO

CREATE PROCEDURE dbo.sp_AutomateDatabaseRestores
	@sourcedbname SYSNAME, 
	@restoredbname SYSNAME,
	@droprestoredb TINYINT = 1,
	@noexec TINYINT = 0
AS
	
SET NOCOUNT ON

--Drop temp tables if they exist
IF OBJECT_ID('tempdb..#backupfiles') IS NOT NULL
BEGIN

	DROP TABLE #backupfiles
	
END 

IF OBJECT_ID('tempdb..#databasefiles') IS NOT NULL
BEGIN

	DROP TABLE #databasefiles
	
END

--Create temp tables
CREATE TABLE #backupfiles
(physicalfilename VARCHAR(2000)
,recoverymodel CHAR(4))

CREATE TABLE #databasefiles
(DatabaseName SYSNAME
,LogicalName SYSNAME
,PhysicalName VARCHAR(2000)
,filetype TINYINT)

--Declare local variables
DECLARE @filecount SMALLINT
DECLARE @fullfilecount SMALLINT
DECLARE @loopcount SMALLINT
DECLARE @datafileloopcount SMALLINT
DECLARE @backuploopcount SMALLINT
DECLARE @backupfile VARCHAR(2000)
DECLARE @sqlstr VARCHAR(MAX)
DECLARE @backupfiletype CHAR(4)
DECLARE @datafilecount SMALLINT
DECLARE @logfilecount SMALLINT
DECLARE @logbackupcount SMALLINT
DECLARE @datafile VARCHAR(2000)
DECLARE @moveparm VARCHAR(2000)
DECLARE @fromstatement VARCHAR(2000)
DECLARE @logfile SYSNAME
DECLARE @physlogfile VARCHAR(2000)
DECLARE @physdatafile VARCHAR(2000)

--Drop the restored database if it exists and @droprestoredb = 1
IF EXISTS(SELECT 1 FROM sys.databases WHERE name = @restoredbname) AND @droprestoredb = 1
BEGIN

	SET @sqlstr = 'DROP DATABASE ' + @restoredbname
	EXEC (@sqlstr)
	
END

--Initialize variables
SET @moveparm = ' WITH'
SET @fromstatement = ' FROM '
SET @loopcount = 1
SET @datafileloopcount = 1
SET @backuploopcount = 1


--Build dynamic SQL to get a list of data and log files for the source database
SET @sqlstr = 'INSERT INTO #databasefiles SELECT ' + '''' + @sourcedbname + '''' + ' AS DatabaseName, name, physical_name, type 
FROM ' + @sourcedbname + '.sys.database_files'

--Execute dynamic SQL to return data and log files for the source database
EXEC (@sqlstr)

--Get counts of data files and log files
SELECT @datafilecount = COUNT(*) FROM #databasefiles WHERE filetype = 0
SELECT @logfilecount  = COUNT(*) FROM #databasefiles WHERE filetype = 1

--Get the logical and physical log file names
SELECT @logfile = LogicalName, @physlogfile = REPLACE(PhysicalName,@sourcedbname,@restoredbname)
FROM #databasefiles
WHERE filetype = 1

--If the database contains one data file, build the MOVE clause for a single file
IF @datafilecount = 1
BEGIN

	SELECT @datafile = LogicalName, @physdatafile = REPLACE(PhysicalName,@sourcedbname,@restoredbname) 
	FROM #databasefiles
	WHERE filetype = 0
	
	SET @moveparm = @moveparm + ' MOVE ' + '''' + @datafile + '''' + ' TO ' + '''' + @physdatafile + '''' + ',' + ' MOVE ' + '''' + @logfile + '''' + ' TO ' + '''' + @physlogfile + '''' + ', NORECOVERY' 
END
ELSE
--If the database contains more than one data file, loop through the list of files and build a multi-file MOVE statement
IF @datafilecount > 1
BEGIN
	
	--SELECT @datafileloopcount, @datafilecount
	WHILE @datafileloopcount <= @datafilecount
	BEGIN
		
		--SELECT TOP (1) LogicalName, REPLACE(PhysicalName,@sourcedbname,@restoredbname) FROM #databasefiles WHERE filetype = 0
		SET @physdatafile = (SELECT TOP (1) REPLACE(PhysicalName,@sourcedbname,@restoredbname) FROM #databasefiles WHERE filetype = 0)
		SET @datafile = (SELECT TOP (1) LogicalName FROM #databasefiles WHERE filetype = 0)		
		SET @moveparm = @moveparm + ' MOVE ' + '''' + @datafile + '''' + ' TO ' + '''' + @physdatafile + '''' + ','
		DELETE TOP (1) FROM #databasefiles WHERE filetype = 0
		SET @datafileloopcount += 1
		
	END	
	
	--Append the MOVE command for the log file to the MOVE clause and set it to NORECOVERY
	SET @moveparm = @moveparm + ' MOVE ' + '''' + @logfile + '''' + ' TO ' + '''' + @physlogfile + '''' + ', NORECOVERY'
		
END

IF @droprestoredb = 0
BEGIN

	SET @moveparm = @moveparm + ', REPLACE'
	
END

--Get the most recent full backup file for the source database and insert it into the #backupfiles temp table
INSERT INTO #backupfiles
SELECT
b.physical_device_name, 'FULL' AS [RecoveryModel]
from msdb.dbo.backupset a join msdb.dbo.backupmediafamily b
  on a.media_set_id = b.media_set_id
where a.database_name = @sourcedbname
AND backup_finish_date =
	(SELECT MAX(c.backup_finish_date)
		FROM msdb.dbo.backupset c 
		INNER JOIN msdb.dbo.backupmediafamily d
		ON c.media_set_id = d.media_set_id 
		WHERE c.database_name = @sourcedbname
		AND REVERSE(SUBSTRING(REVERSE(d.physical_device_name),1,3)) = 'BAK')
order by a.backup_finish_date ASC

--Get all log backupfiles run after the latest full backup and insert it into the #backupfiles temp table
INSERT INTO #backupfiles
SELECT
b.physical_device_name, 'LOG'  AS [RecoveryModel]
from msdb.dbo.backupset a join msdb.dbo.backupmediafamily b
  on a.media_set_id = b.media_set_id
where a.database_name = @sourcedbname
AND REVERSE(SUBSTRING(REVERSE(b.physical_device_name),1,3)) = 'TRN'
AND backup_finish_date >
	(SELECT MAX(c.backup_start_date)
		FROM msdb.dbo.backupset c 
		INNER JOIN msdb.dbo.backupmediafamily d
		ON c.media_set_id = d.media_set_id 
		WHERE c.database_name = @sourcedbname
		AND REVERSE(SUBSTRING(REVERSE(d.physical_device_name),1,3)) = 'BAK')
order by a.backup_finish_date ASC

--Get counts of all backup files, full backup files, and log backup files for use in loop processing below
SELECT @filecount = COUNT(*) FROM #backupfiles
SELECT @fullfilecount = COUNT(*) FROM #backupfiles WHERE recoverymodel = 'FULL'
SELECT @logbackupcount = COUNT(*) FROM #backupfiles WHERE recoverymodel = 'LOG'

--While backup files exists, loop through them to generate the restore statement
WHILE @loopcount <= @filecount
BEGIN

	--Get the top backup file from the temp table	
	SET @backupfiletype = (SELECT TOP 1 recoverymodel FROM #backupfiles)
	
	--If it is a full backup file, build the restore statement
	IF @backupfiletype = 'FULL'
	BEGIN
		
		--If there are no log backups to apply, replace NORECOVERY with RECOVERY in the MOVE clause
		IF @logbackupcount = 0
		BEGIN
		
			SET @moveparm = REPLACE(@moveparm, 'NORECOVERY', 'RECOVERY')
			
		END
	
		--If there is a single full backup file, build the RESTORE statement with that file
		IF @fullfilecount = 1
		BEGIN
		
			SET @backupfile = (SELECT TOP 1 physicalfilename FROM #backupfiles)
		
			SET @sqlstr = 'RESTORE DATABASE ' + @restoredbname + ' FROM DISK = ' + '''' + @backupfile + '''' + @moveparm
			--PRINT @sqlstr
			DELETE TOP (1) FROM #backupfiles
			
		END
		--If there is more than one full backup file, build the RESTORE command for all full backup files
		ELSE IF @fullfilecount > 1
		BEGIN
			
			WHILE @backuploopcount <= @fullfilecount
			BEGIN
			
				SET @backupfile = (SELECT TOP 1 physicalfilename FROM #backupfiles WHERE recoverymodel = 'FULL')
				SET @fromstatement = @fromstatement + 'DISK = ' + '''' + @backupfile + '''' + ','
				DELETE TOP (1) FROM #backupfiles WHERE recoverymodel = 'FULL'
				SET @backuploopcount += 1
			
			END
			
			--Truncate the trailing comma from the FROM clause
			SET @fromstatement = SUBSTRING(@fromstatement,1,(LEN(@fromstatement) - 1))
			SET @sqlstr = 'RESTORE DATABASE ' + @restoredbname + @fromstatement + @moveparm
			SET @loopcount += 1
			--PRINT @sqlstr
			
		END
			
			
	END
	--If it is a log backup file, build a RESTORE log statement
	--One RESTORE datement will be built for each log backup file
	ELSE IF @backupfiletype = 'LOG'
	BEGIN
	
		SET @backupfile = (SELECT TOP 1 physicalfilename FROM #backupfiles)

		SET @sqlstr = 'RESTORE LOG ' + @restoredbname + ' FROM DISK = ' + '''' + @backupfile + ''''
		
		--If there is another log backup file, set the RESTORE to WITH NORECOVERY
		IF (SELECT COUNT(*) FROM #backupfiles) > 1
		BEGIN
		
			SET @sqlstr = @sqlstr + ' WITH NORECOVERY'
			
		END
		--If there is not another log backup file, set the RESTORE to WITH RECOVERY
		ELSE
		BEGIN
		
			SET @sqlstr = @sqlstr + ' WITH RECOVERY'
		
		END
		
		DELETE TOP (1) FROM #backupfiles

	
	END
	
	--If @noexec = 1, PRINT @sqlstr
	IF @noexec = 1
	BEGIN
	
		PRINT @sqlstr
	
	END
	--If @noexec <> 1, EXEC @sqlstr
	ELSE 
	BEGIN
	
		EXEC (@sqlstr)
		
	END
	
	--Increment the loop count and continue processing backup files
	SET @loopcount += 1
	
END


GO
Categories: Restores, SQL Server, T-SQL Tags: ,