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/********************************************************************************************************** *
* *
* Name: Backup Test Harness.sql (version 1.0 2012-12-11) *
* *
* Author: Nicholas Cain, http://sirsql.net *
* *
* Purpose: This script is written for the purposes of performing multiple backups of a database using *
* different MAXTRANSFERSIZE & BUFFERCOUNT values as well as different numbers of backup files. *
* This is done in an attempt to identify the optimal settings that can be used to minimize backup *
* times. *
* *
* Notes: *
* When executed the script will create a job on the SQL instance. This job, when executed will perform *
* (at minimum) 40 backups. *
* *
* Firstly all the specified maxtranfersize and buffercount combinations will be tested to a nul file. This *
* will give a value showing the absolute fastest possible backup speed (as it reads all of the pages from *
* the database). *
* *
* Next it will move on and perform the same tests with one file, and continue with more files up to the *
* limit specified in @MaxBackupFiles. *
* *
* *
* Variables used & purpose: *
* @DatabaseName - The name of the database you want to test the backups with *
* @MaxBackupFiles - The maximum number of backup files you want to write to *
* @BackupFolder - The destination folder for the backups *
* @WithCompression - Whether or not to use SQL Server compression (SQL 2008+) *
* @CreateJob - This creates a SQL agent job which can be executed to perform the tests *
* @JobLogFileName - The path and filename of the log for the job (used for evaluating data) *
* @OutputToScreen - Outputs the backup commands to the screen ready for copy/paste/execution *
* *
* *
* Additional adjustments that can be made: *
* @MaxTransferSize table variable contains a list of sizes. Add/remove entries based on preference. *
* The currently used sizes are a good starting point *
* *
* @BufferCount table variable contains a list of different buffercount sizes. The current sizes are *
* a good starting point. *WARNING* Higher buffercount values along with high *
* maxtransfersize values will cause SQL to start paging out memory *
* *
* *
* Once the job has been executed the log file can be used with "Parse Backup Perf Tests.ps1" to asses *
* the different levels of performance. Use the SQL Server errorlog to look for backup settings that have *
* caused memory paging in SQL Server (look for "A significant part of sql server process memory has been *
* paged out. This may result in a performance degradation") *
* *
* WARNING: Performing this many backup tests (with all the various settings can and will impact your *
* server performance. Be aware of this. Do not cause issues for your users when performing the *
* tests, they will not like you for it. *
* *
* For more information on backup tuning see the videos at http://midnightdba.itbookworm.com/Admin.aspx *
* *
* Issues or concerns with this script please contact me - Nic Cain at Nic@sirql.net *
* *
**************************************************************************************************************/
SET NOCOUNT ON;
/* Declare the variables we'll use for our settings */
DECLARE @DatabaseName NVARCHAR(128) ,
@MaxBackupFiles TINYINT ,
@BackupFolder NVARCHAR(500) ,
@WithCompression TINYINT ,
@CreateJob TINYINT ,
@JobLogFileName NVARCHAR(500) ,
@OutputToScreen TINYINT
/* Enter the values here for your backup testing */
SELECT @DatabaseName = 'AdminDB' ,
@MaxBackupFiles = 2 ,
@BackupFolder = 'C:\Backup' ,
@WithCompression = 1 ,
@CreateJob = 1 ,
@JobLogFileName = 'C:\Backup\Backup.log' ,
@OutputToScreen = 0;
/* Table to hold the possible values for MAXTRANSFERSIZE. Add new rows if you want to test additional values */
DECLARE @MaxTransferSize TABLE ( TransferSize INT );
INSERT INTO @MaxTransferSize
VALUES ( 65536 ),
( 1048576 ),
( 2097152 ),
( 4194304 );
/* Table to hold the possible values for BUFFERCOUNT. Add new rows if you want to test additional values */
DECLARE @Buffercount TABLE ( Buffers SMALLINT );
INSERT INTO @Buffercount
VALUES ( 100 ),
( 500 ),
( 1000 ),
( 1500 ),
( 2000 );
/* Create the temp table to hold a list of the files based on location & file count */
IF OBJECT_ID('tempdb..#Disk') IS NOT NULL
DROP TABLE #Disk;
CREATE TABLE #Disk
(
Id SMALLINT IDENTITY(1, 1) ,
FileCount TINYINT ,
Cmd NVARCHAR(4000)
);
/* Build our disk commands based on the max number of backup files */
DECLARE @FilesCmd NVARCHAR(4000) ,
@CurrFile TINYINT;
SELECT @CurrFile = 1 ,
@FilesCmd = N'TO';
WHILE @CurrFile <= @MaxBackupFiles
BEGIN
IF @CurrFile > 1
SELECT @FilesCmd = @FilesCmd + N',';
SELECT @FilesCmd = @FilesCmd + N' DISK = ' + CHAR(39) + @BackupFolder
+ '\BackupPerfTest' + CONVERT(NVARCHAR(2), @CurrFile) + '.bak'
+ CHAR(39);
INSERT INTO #Disk
( FileCount, Cmd )
SELECT @CurrFile, @FilesCmd;
SELECT @CurrFile = @CurrFile + 1;
END
/* Create a table to hold all the backup commands, ready for executing */
IF OBJECT_ID('tempdb..#BackupCommands') IS NOT NULL
DROP TABLE #BackupCommands;
CREATE TABLE #BackupCommands
(
Id SMALLINT IDENTITY(1, 1) ,
BackupCmd NVARCHAR(4000)
);
/* Add entries for enabling the traceflag to output the backup config values & cycle the error log */
INSERT INTO #BackupCommands
( BackupCmd
)
SELECT 'DBCC TRACEON (3213, 3604, -1);
EXEC sp_cycle_Errorlog;'
/* Backup with default options for current baseline */
INSERT INTO #BackupCommands
( BackupCmd
)
SELECT 'RAISERROR('+CHAR(39)+'NEW BACKUP' + CHAR(39) + ',0,1) WITH NOWAIT;' + CHAR(13)+CHAR(10)
+ 'RAISERROR ('+CHAR(39) + 'BACKUP SETTINGS: MAXTRANSFERSIZE=0'
+ ' BUFFERCOUNT=0'
+ ' FILECOUNT=' + CONVERT(NVARCHAR(2), b.FileCount)
+ CHAR(39) + ', 0, 1) WITH NOWAIT, LOG ;'+ CHAR(13) + CHAR(10)
+ 'BACKUP DATABASE ' + QUOTENAME(@DatabaseName) + N' ' + b.Cmd
+ ' WITH FORMAT, INIT' + CASE @WithCompression
WHEN 1 THEN ', COMPRESSION;'
ELSE ';'
END
FROM #Disk b
ORDER BY b.Id
/* Backup to NUL for all the various options, this is the max possible backup speed */
INSERT INTO #BackupCommands
( BackupCmd
)
SELECT 'RAISERROR('+CHAR(39)+'NEW BACKUP' + CHAR(39) + ',0,1) WITH NOWAIT;' + CHAR(13)+CHAR(10)
+ 'RAISERROR ('+CHAR(39) + 'BACKUP SETTINGS: MAXTRANSFERSIZE='+ CONVERT(VARCHAR(7), TransferSize)
+ ' BUFFERCOUNT='+ CONVERT(VARCHAR(4), Buffers)
+ ' FILECOUNT=0'
+ CHAR(39) + ', 0, 1) WITH NOWAIT, LOG ;'+ CHAR(13) + CHAR(10)
+ 'BACKUP DATABASE ' + QUOTENAME(@DatabaseName) + N' TO DISK = '
+ CHAR(39) + 'NUL' + CHAR(39)
+ ' WITH FORMAT, INIT, MAXTRANSFERSIZE = '
+ CONVERT(VARCHAR(7), TransferSize) + ', BUFFERCOUNT = '
+ CONVERT(VARCHAR(4), Buffers)
+ CASE @WithCompression
WHEN 1 THEN ', COMPRESSION;'
ELSE ';'
END
FROM @MaxTransferSize
CROSS APPLY @Buffercount
ORDER BY Buffers ,
TransferSize;
/* Backup with all the various file counts, transfer sizes and buffer options */
INSERT INTO #BackupCommands
( BackupCmd
)
SELECT 'RAISERROR('+CHAR(39)+'NEW BACKUP' + CHAR(39) + ',0,1) WITH NOWAIT;' + CHAR(13)+CHAR(10)
+ 'RAISERROR ('+CHAR(39) + 'BACKUP SETTINGS: MAXTRANSFERSIZE='+ CONVERT(VARCHAR(7), TransferSize)
+ ' BUFFERCOUNT='+ CONVERT(VARCHAR(4), Buffers)
+ ' FILECOUNT=' + CONVERT(NVARCHAR(2), b.FileCount)
+ CHAR(39) + ', 0, 1) WITH NOWAIT, LOG ;'+ CHAR(13) + CHAR(10)
+ 'BACKUP DATABASE ' + QUOTENAME(@DatabaseName) + N' ' + b.Cmd
+ ' WITH FORMAT, INIT, MAXTRANSFERSIZE = '
+ CONVERT(VARCHAR(7), TransferSize) + ', BUFFERCOUNT = '
+ CONVERT(VARCHAR(4), Buffers)
+ CASE @WithCompression
WHEN 1 THEN ', COMPRESSION;'
ELSE ';'
END
FROM @MaxTransferSize
CROSS APPLY @Buffercount
CROSS APPLY #Disk b
ORDER BY b.Id ,
Buffers ,
TransferSize;
/* Don't forget to turn off the trace flags */
INSERT INTO #BackupCommands
( BackupCmd
)
SELECT 'DBCC TRACEOFF (3213, 3604, -1);'
/* Create a SQL job which can be used to run the backups (if option enabled) */
IF @CreateJob = 1
BEGIN
DECLARE @JobCmd NVARCHAR(MAX) ,
@TotalCmds TINYINT;
SELECT @JobCmd = '' ,
@CurrFile = 1 ,
@TotalCmds = MAX(Id)
FROM #BackupCommands;
WHILE @CurrFile <= @TotalCmds
BEGIN
SELECT @JobCmd = @JobCmd + BackupCmd + CHAR(13) + CHAR(10)
FROM #BackupCommands
WHERE @CurrFile = Id;
SELECT @CurrFile = @CurrFile + 1;
END
DECLARE @jobId BINARY(16), @JobName NVARCHAR(128);
SELECT @JobName = N'Test Backup Performance '+ CONVERT(nchar(20), GETDATE(), 120)
EXEC msdb.dbo.sp_add_job @job_name = @JobName,
@enabled = 1, @notify_level_eventlog = 0, @notify_level_email = 0,
@notify_level_netsend = 0, @notify_level_page = 0, @delete_level = 0,
@description = N'Runs multiple database backups to assess performance of various options',
@category_name = N'[Uncategorized (Local)]', @owner_login_name = N'sa',
@job_id = @jobId OUTPUT;
EXEC msdb.dbo.sp_add_jobstep @job_id = @jobId, @step_name = N'Run Backups',
@step_id = 1, @cmdexec_success_code = 0, @on_success_action = 1,
@on_success_step_id = 0, @on_fail_action = 2, @on_fail_step_id = 0,
@retry_attempts = 0, @retry_interval = 0, @os_run_priority = 0,
@subsystem = N'TSQL', @command = @JobCmd, @database_name = N'master',
@output_file_name = @JobLogFileName, @flags = 0;
EXEC msdb.dbo.sp_update_job @job_id = @jobId, @start_step_id = 1;
EXEC msdb.dbo.sp_add_jobserver @job_id = @jobId, @server_name = N'(local)';
END
/* Output to screen if option enabled */
IF @OutputToScreen = 1
BEGIN
SELECT BackupCmd
FROM #BackupCommands
ORDER BY Id
END
IF OBJECT_ID('tempdb..#Disk') IS NOT NULL
DROP TABLE #Disk;
IF OBJECT_ID('tempdb..#BackupCommands') IS NOT NULL
DROP TABLE #BackupCommands;
<#
.SYNOPSIS
Reads a SQL job log containing the output from backup performance tests and displays the results in excel.
.DESCRIPTION
This script is designed to read the output from a logfile that contains multiple backups which use
different settings of MAXTRANFERSIZE & BUFFERCOUNT. This logfile will have been created by executing the job
created using "Backup Test Harness.sql".
It will read in the log and output the results to excel (you must have this installed). It will also create
two charts which provide a visual representation of the current, optimal and best possible backup performance
for the given database. This information will be broken down by file count, maxtransfersize and buffercount.
The script is based upon one created for parsing SQLIO output, written by Jonathan Kehayis which can be found
at http://sqlblog.com/blogs/jonathan_kehayias/archive/2010/05/25/parsing-sqlio-output-to-excel-charts-using-regex-in-powershell.aspx
Any questions or problems with this script please contact me - Nic Cain at nic@sirsql.net
.PARAMETER <paramName>
BackupLogFileName - The path & filename of the backup log
.EXAMPLE
&'Parse Backup Perf Tests.ps1' -BackupLogFileName "C:\Temp\Log.txt"
&'Parse Backup Perf Tests.ps1' "C:\Temp\Log.txt"
#>
param( [Parameter(Mandatory=$TRUE)] [ValidateNotNullOrEmpty()] [string] $BackupLogFileName)
IF (Test-Path $BackupLogFileName)
{
#$BackupLogFileName = 'C:\Temp\Backup.log'
#Pull in the log file
TRY
{
$BackupLogFileData = [string]::Join([Environment]::NewLine,(Get-Content $BackupLogFileName));
#Create a split list of the items to query
$BackupTestResults = $BackupLogFileData.Split([String[]]"NEW BACKUP [SQLSTATE 01000]", [StringSplitOptions]::RemoveEmptyEntries ) |
#Grab the relevant values from each of the backups performed
select @{Name="BufferCount"; Expression={[int]([regex]::Match($_, "BufferCount:(\s*\d+)").Groups[1].Value)}},
@{Name="MaxTransferSize"; Expression={[int] ([regex]::Match($_, "MaxTransferSize:(\s*\d+)").Groups[1].Value)}},
@{Name="BackupTimeInSeconds"; Expression={[double] ([regex]::Match($_, "pages in (\s*\d+.\d+)").Groups[1].Value)}},
@{Name="BackupSpeedInMBsec"; Expression={[double] ([regex]::Match($_, "pages in (\s*\d+.\d+) seconds \((\d+.\d+) MB/sec").Groups[2].Value)}},
@{Name="BackupFileCount"; Expression={[int] ([regex]::Match($_, "FILECOUNT=(\d+)").Groups[1].Value)}}
#Create a new excel workbook
$Excel = New-Object -ComObject Excel.Application
$Excel.Visible = $true
$WorkBook = $Excel.WorkBooks.Add()
$WorkBook.WorkSheets.Item(1).Name = "Backup Data"
$WorkBook.WorkSheets.Item(3).Delete()
$WorkBook.WorkSheets.Item(2).Delete()
$WorkSheet = $WorkBook.Worksheets.Item("Backup Data")
$x = 2
#Add headers for the rows
$WorkSheet.Cells.Item(1,1) = "BufferCount"
$WorkSheet.Cells.Item(1,2) = "MaxTransferSize"
$WorkSheet.Cells.Item(1,3) = "Backup Time /sec"
$WorkSheet.Cells.Item(1,4) = "Backup Speed MB/sec"
$WorkSheet.Cells.Item(1,5) = "Backup File Count"
$WorkSheet.Cells.Item(1,6) = "Caption"
$WorkSheet.Cells.Item(1,8) = "BufferCount"
$WorkSheet.Cells.Item(1,9) = "MaxTransferSize"
$WorkSheet.Cells.Item(1,10) = "Backup Time /sec"
$WorkSheet.Cells.Item(1,11) = "Backup Speed MB/sec"
$WorkSheet.Cells.Item(1,12) = "Backup File Count"
$WorkSheet.Cells.Item(1,13) = "Caption"
#Put in the information for the default backup
#All performance improvements will be identified against this value
$BackupTestResults | Select-Object -First 1 -Skip 1 | % {
$WorkSheet.Cells.Item($x,1) = $_.BufferCount
$WorkSheet.Cells.Item($x,2) = $_.MaxTransferSize
$WorkSheet.Cells.Item($x,3) = $_.BackupTimeInSeconds
$WorkSheet.Cells.Item($x,4) = $_.BackupSpeedInMBSec
$WorkSheet.Cells.Item($x,5) = $_.BackupFileCount
$WorkSheet.Cells.Item($x,6) = "DEFAULT BACKUP! - Buffers:" + [string]$_.BufferCount + " MaxTransfer:" + [string]$_.MaxTransferSize + " Files:" + [string]$_.BackupFileCount
$x++}
#Put in the absolute fastest backup to nul
#We know we can't get any faster than this, good reference point
$BackupTestResults | Where-Object {$_.BackupFileCount -eq 0} | Sort-Object BackupSpeedInMBSec -Descending | Select-Object -First 1 | % {
$WorkSheet.Cells.Item($x,1) = $_.BufferCount
$WorkSheet.Cells.Item($x,2) = $_.MaxTransferSize
$WorkSheet.Cells.Item($x,3) = $_.BackupTimeInSeconds
$WorkSheet.Cells.Item($x,4) = $_.BackupSpeedInMBSec
$WorkSheet.Cells.Item($x,5) = $_.BackupFileCount
$WorkSheet.Cells.Item($x,6) = "FASTEST NUL BACKUP! - Buffers:" + [string]$_.BufferCount + " MaxTransfer:" + [string]$_.MaxTransferSize
$x++}
#Put in the information for all the backups, ordered by the backup speed in MB/sec
$BackupTestResults | Where-Object {$_.BackupFileCount -gt 0} | Sort-Object BackupSpeedInMBSec -Descending | % { if ($_.BufferCount -gt 0)
{
$WorkSheet.Cells.Item($x,1) = $_.BufferCount
$WorkSheet.Cells.Item($x,2) = $_.MaxTransferSize
$WorkSheet.Cells.Item($x,3) = $_.BackupTimeInSeconds
$WorkSheet.Cells.Item($x,4) = $_.BackupSpeedInMBSec
$WorkSheet.Cells.Item($x,5) = $_.BackupFileCount
$WorkSheet.Cells.Item($x,6) = "Buffers:" + [string]$_.BufferCount + " MaxTransfer:" + [string]$_.MaxTransferSize + " Files:" + [string]$_.BackupFileCount
$x++}
}
$y = 2
$BackupTestResults | Select-Object -First 1 -Skip 1 | % {
$WorkSheet.Cells.Item($y,10) = $_.BackupTimeInSeconds
$WorkSheet.Cells.Item($y,11) = $_.BackupSpeedInMBSec
$WorkSheet.Cells.Item($y,12) = $_.BackupFileCount
$WorkSheet.Cells.Item($y,13) = "DEFAULT BACKUP! - Buffers:" + [string]$_.BufferCount + " MaxTransfer:" + [string]$_.MaxTransferSize + " Files:" + [string]$_.BackupFileCount
$y++}
$BackupTestResults | Where-Object {$_.BackupFileCount -eq 0} | Sort-Object BackupTimeInSeconds -Descending | Select-Object -First 1 | % {
$WorkSheet.Cells.Item($y,10) = $_.BackupTimeInSeconds
$WorkSheet.Cells.Item($y,11) = $_.BackupSpeedInMBSec
$WorkSheet.Cells.Item($y,12) = $_.BackupFileCount
$WorkSheet.Cells.Item($y,13) = "FASTEST NUL BACKUP! - Buffers:" + [string]$_.BufferCount + " MaxTransfer:" + [string]$_.MaxTransferSize
$y++}
#Put in the information for all the backups, ordered by the backup time in seconds
$BackupTestResults | Where-Object {$_.BackupFileCount -gt 0} | Sort-Object BackupTimeInSeconds | % { if ($_.BufferCount -gt 0)
{
$WorkSheet.Cells.Item($y,10) = $_.BackupTimeInSeconds
$WorkSheet.Cells.Item($y,11) = $_.BackupSpeedInMBSec
$WorkSheet.Cells.Item($y,12) = $_.BackupFileCount
$WorkSheet.Cells.Item($y,13) = "Buffers:" + [string]$_.BufferCount + " MaxTransfer:" + [string]$_.MaxTransferSize + " Files:" + [string]$_.BackupFileCount
$y++}
}
#Add a couple of charts for a nice visual layout of backup performance
$WorkBook.Charts.Add() | Out-Null
$Chart = $WorkBook.ActiveChart
$Chart.ApplyLayout(3)
$Chart.SetSourceData($WorkSheet.Range("D1:D$x"))
$Chart.SeriesCollection(1).xValues = $WorkSheet.Range("F2:F$x")
$Chart.SetSourceData($WorkSheet.Range("D1:D$x"))
$Chart.SeriesCollection(1).xValues = $WorkSheet.Range("F2:F$x")
$Chart.Name = "Backup Speed"
$WorkBook.Charts.Add() | Out-Null
$Chart = $WorkBook.ActiveChart
$Chart.ApplyLayout(3)
$Chart.SetSourceData($WorkSheet.Range("J1:J$y"))
$Chart.SeriesCollection(1).xValues = $WorkSheet.Range("M2:M$y")
$Chart.Name = "Backup Time"
}
CATCH
{
}
}
ELSE
{
Write-Error "The file $BackupLogFileName does not exist."
}
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