functions/Measure-DbaBackupThroughput.ps1

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function Measure-DbaBackupThroughput
{
<#
.SYNOPSIS
Determines how quickly SQL Server is backing up databases to media.
 
.DESCRIPTION
Returns backup history details for some or all databases on a SQL Server.
 
Output looks like this
Server : sql2016
Database : SharePoint_Config
AvgThroughputMB : 1.07
AvgSizeMB : 24.17
AvgDuration : 00:00:01.1000000
MinThroughputMB : 0.02
MaxThroughputMB : 2.26
MinBackupDate : 8/6/2015 10:22:01 PM
MaxBackupDate : 6/19/2016 12:57:45 PM
BackupCount : 10
 
.PARAMETER SqlInstance
SqlInstance name or SMO object representing the SQL Server to connect to.
This can be a collection and receive pipeline input.
 
.PARAMETER SqlCredential
PSCredential object to connect as. If not specified, currend Windows login will be used.
 
.PARAMETER Type
By default, this command measures the speed of Full backups. You can also specify Log or Differential.
 
.PARAMETER Since
Datetime object used to narrow the results to a date
 
.PARAMETER Last
Measure only the last backup
 
 
.NOTES
Tags: DisasterRecovery, Backup
dbatools PowerShell module (https://dbatools.io, clemaire@gmail.com)
Copyright (C) 2016 Chrissy LeMaire
This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
 
.LINK
https://dbatools.io/Measure-DbaBackupThroughput
 
.EXAMPLE
Measure-DbaBackupThroughput -SqlInstance sqlserver2016a
Will fill this in
 
.EXAMPLE
Measure-DbaBackupThroughput -SqlInstance sqlserver2016a -Databases db1
Will fill this in
  
.EXAMPLE
Measure-DbaBackupThroughput -SqlInstance sql2005 -Last
Full
  
.EXAMPLE
Measure-DbaBackupThroughput -SqlInstance sql2005 -Last -Type Log
  
.EXAMPLE
Measure-DbaBackupThroughput -SqlInstance sql2005 -Last -Type Log
 
.EXAMPLE
Measure-DbaBackupThroughput -SqlInstance sql2016 -Since (Get-Date).AddDays(-7)
  
Gets info for last week
  
.EXAMPLE
Measure-DbaBackupThroughput -SqlInstance sql2016 -Since (Get-Date).AddDays(-365) -Databases bigoldb
  
Will fill this in
 
#>

[CmdletBinding()]
param (
[parameter(Position = 0, Mandatory = $true, ValueFromPipeline = $True)]
[Alias("ServerInstance", "Instance", "SqlServer")]
[object[]]$SqlInstance,
[PSCredential][System.Management.Automation.CredentialAttribute()]$SqlCredential,
[datetime]$Since,
[switch]$Last,
[ValidateSet("Full", "Log", "Differential")]
[string]$Type = "Full"
)

DynamicParam { if ($SqlInstance) { return Get-ParamSqlDatabases -SqlServer $SqlInstance[0] -SqlCredential $SqlCredential } }

BEGIN
{
$databases = $psboundparameters.Databases

if ($Since)
{
$Since = $Since.ToString("yyyy-MM-dd HH:mm:ss")
}
}
process
{
foreach ($instance in $SqlInstance)
{
try
{
Write-Verbose "Connecting to $instance"
$server = Connect-SqlServer -SqlServer $instance -SqlCredential $sqlcredential
}
catch
{
Write-Warning "Failed to connect to $instance"
continue
}

if (!$databases) { $databases = $server.databases.name }

foreach ($database in $databases)
{
Write-Verbose "Getting backup history for $database"

$allhistory = @()

# Splatting didnt work
if ($since)
{
$histories = Get-DbaBackupHistory -SqlServer $server -Databases $database -Last:$last -Since $since | Where-Object Type -eq $Type
}
else
{
$histories = Get-DbaBackupHistory -SqlServer $server -Databases $database -Last:$last | Where-Object Type -eq $Type
}

foreach ($history in $histories)
{
$timetaken = New-TimeSpan –Start $history.Start –End $history.End

if ($timetaken.TotalMilliseconds -eq 0)
{
$throughput = $history.TotalSizeMB
}
else
{
$throughput = $history.TotalSizeMB % $timetaken.TotalSeconds + 1
}

Add-Member -InputObject $history -MemberType Noteproperty -Name MBps -value $throughput

$allhistory += $history | Select-Object Server, Database, MBps, TotalSizeMB, Start, End
}

foreach ($db in ($allhistory | Sort-Object Database | Group-Object Database))
{
$measuremb = $db.Group.MBps | Measure-Object -Average -Minimum -Maximum
$measurestart = $db.Group.Start | Measure-Object -Minimum
$measureend = $db.Group.End | Measure-Object -Maximum
$measuresize = $db.Group.TotalSizeMB | Measure-Object -Average
$avgduration = $db.Group | ForEach-Object { New-TimeSpan -Start $_.Start -End $_.End } | Measure-Object -Average TotalSeconds

$date = Get-Date

[pscustomobject]@{
Server = $db.Group.Server | Select-Object -First 1
Database = $db.Name
AvgThroughputMB = [System.Math]::Round($measuremb.Average, 2)
AvgSizeMB = [System.Math]::Round($measuresize.Average, 2)
AvgDuration = New-TimeSpan -Start $date -End $date.AddSeconds($avgduration.Average)
MinThroughputMB = [System.Math]::Round($measuremb.Minimum, 2)
MaxThroughputMB = [System.Math]::Round($measuremb.Maximum, 2)
MinBackupDate = $measurestart.Minimum
MaxBackupDate = $measureend.Maximum
BackupCount = $db.Count
}
}
}
}
}
}