functions/Get-DbaDatabaseSpace.ps1

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function Get-DbaDatabaseSpace {
<#
 .SYNOPSIS
  Returns database file space information for database files on a SQL instance.
  
 .DESCRIPTION
  This function returns database file space information for a SQL Instance or group of SQL
  Instances. Information is based on a query against sys.database_files and the FILEPROPERTY
  function to query and return information. The function can accept a single instance or
  multiple instances. By default, only user dbs will be shown, but using the IncludeSystemDBs
  switch will include system databases
   
  File free space script borrowed and modified from Glenn Berry's DMV scripts (http://www.sqlskills.com/blogs/glenn/category/dmv-queries/)
  
 .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 under. If not specified, current Windows login will be used.
  
 .PARAMETER Database
  The database(s) to process - this list is auto-populated from the server. If unspecified, all databases will be processed.
  
 .PARAMETER ExcludeDatabase
  The database(s) to exclude - this list is auto-populated from the server
  
 .PARAMETER IncludeSystemDBs
  Switch parameter that when used will display system database information
  
 .PARAMETER Silent
  Replaces user friendly yellow warnings with bloody red exceptions of doom!
  Use this if you want the function to throw terminating errors you want to catch.
  
 .EXAMPLE
  Get-DbaDatabaseSpace -SqlInstance localhost
   
  Returns all user database files and free space information for the local host
  
 .EXAMPLE
  Get-DbaDatabaseSpace -SqlInstance localhost | Where-Object {$_.PercentUsed -gt 80}
   
  Returns all user database files and free space information for the local host. Filters
  the output object by any files that have a percent used of greater than 80%.
  
 .EXAMPLE
  'localhost','localhost\namedinstance' | Get-DbaDatabaseSpace
   
  Returns all user database files and free space information for the localhost and
  localhost\namedinstance SQL Server instances. Processes data via the pipeline.
  
 .EXAMPLE
  Get-DbaDatabaseSpace -SqlInstance localhost -Database db1, db2
   
  Returns database files and free space information for the db1 and db2 on localhost.
  
 .NOTES
  Original Author: Michael Fal (@Mike_Fal), http://mikefal.net
  Website: https://dbatools.io
  Copyright: (C) Chrissy LeMaire, clemaire@gmail.com
  License: GNU GPL v3 https://opensource.org/licenses/GPL-3.0
  
 .LINK
  https://dbatools.io/Get-DbaDatabaseSpace
#>

    [CmdletBinding()]
    param ([parameter(ValueFromPipeline, Mandatory = $true)]
        [Alias("ServerInstance", "SqlServer")]
        [DbaInstanceParameter[]]
        $SqlInstance,
        
        [System.Management.Automation.PSCredential]
        $SqlCredential,
        
        [Alias("Databases")]
        [object[]]
        $Database,
        
        [object[]]
        $ExcludeDatabase,
        
        [switch]
        $IncludeSystemDBs,
        
        [switch]
        $Silent
    )
    
    begin {
        Write-Message -Level System -Message "Bound parameters: $($PSBoundParameters.Keys -join ", ")"
        
        $sql = "SELECT SERVERPROPERTY('MachineName') AS ComputerName,
           ISNULL(SERVERPROPERTY('InstanceName'), 'MSSQLSERVER') AS InstanceName,
           SERVERPROPERTY('ServerName') AS SqlInstance,
     DB_NAME() as DBName
     ,f.name AS [FileName]
     ,fg.name AS [Filegroup]
     ,f.physical_name AS [PhysicalName]
     ,f.type_desc AS [FileType]
     ,CAST(CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int)/128.0 AS FLOAT) as [UsedSpaceMB]
     ,CAST(f.size/128.0 - CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int)/128.0 AS FLOAT) AS [FreeSpaceMB]
     ,CAST((f.size/128.0) AS FLOAT) AS [FileSizeMB]
     ,CAST((FILEPROPERTY(f.name, 'SpaceUsed')/(f.size/1.0)) * 100 as FLOAT) as [PercentUsed]
     ,CAST((f.growth/128.0) AS FLOAT) AS [GrowthMB]
     ,CASE is_percent_growth WHEN 1 THEN 'pct' WHEN 0 THEN 'MB' ELSE 'Unknown' END AS [GrowthType]
     ,CASE f.max_size WHEN -1 THEN 2147483648. ELSE CAST((f.max_size/128.0) AS FLOAT) END AS [MaxSizeMB]
     ,CAST((f.size/128.0) AS FLOAT) - CAST(CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int)/128.0 AS FLOAT) AS [SpaceBeforeAutoGrow]
     ,CASE f.max_size    WHEN (-1)
          THEN CAST(((2147483648.) - CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int))/128.0 AS FLOAT)
          ELSE CAST((f.max_size - CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int))/128.0 AS FLOAT)
          END AS [SpaceBeforeMax]
     ,CASE f.growth    WHEN 0 THEN 0.00
         ELSE    CASE f.is_percent_growth    WHEN 0
             THEN    CASE f.max_size
               WHEN (-1)
               THEN CAST(((((2147483648.)-f.Size)/f.Growth)*f.Growth)/128.0 AS FLOAT)
               ELSE CAST((((f.max_size-f.Size)/f.Growth)*f.Growth)/128.0 AS FLOAT)
               END
             WHEN 1
             THEN    CASE f.max_size
               WHEN (-1)
               THEN CAST(CONVERT([int],f.Size*power((1)+CONVERT([float],f.Growth)/(100),CONVERT([int],log10(CONVERT([float],(2147483648.))/CONVERT([float],f.Size))/log10((1)+CONVERT([float],f.Growth)/(100)))))/128.0 AS FLOAT)
               ELSE CAST(CONVERT([int],f.Size*power((1)+CONVERT([float],f.Growth)/(100),CONVERT([int],log10(CONVERT([float],f.Max_Size)/CONVERT([float],f.Size))/log10((1)+CONVERT([float],f.Growth)/(100)))))/128.0 AS FLOAT)
               END
             ELSE (0)
             END
         END AS [PossibleAutoGrowthMB]
     , CASE f.growth    WHEN 0 THEN    CASE f.max_size
            WHEN (-1)
            THEN CAST(((2147483648.) - CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int))/128.0 AS FLOAT)
            ELSE CAST((f.max_size - CAST(FILEPROPERTY(f.name, 'SpaceUsed') AS int))/128.0 AS FLOAT)
            END
         ELSE CAST((f.max_size - f.size - (    CASE f.is_percent_growth
            WHEN 0
            THEN    CASE f.max_size
              WHEN (-1)
              THEN CONVERT(FLOAT,((((2147483648.)-f.Size)/f.Growth)*f.Growth))
              ELSE CONVERT(FLOAT,(((f.max_size-f.Size)/f.Growth)*f.Growth))
              END
            WHEN 1
            THEN    CASE f.max_size
              WHEN (-1)
              THEN CONVERT([int],f.Size*power((1)+CONVERT([float],f.Growth)/(100),CONVERT([int],log10(CONVERT([float],(2147483648.))/CONVERT([float],f.Size))/log10((1)+CONVERT([float],f.Growth)/(100)))))
              ELSE CONVERT([int],f.Size*power((1)+CONVERT([float],f.Growth)/(100),CONVERT([int],log10(CONVERT([float],f.Max_Size)/CONVERT([float],f.Size))/log10((1)+CONVERT([float],f.Growth)/(100)))))
              END
              ELSE (0)
              END ))/128.0 AS FLOAT)
         END AS [UnusableSpaceMB]
  
    FROM sys.database_files AS f WITH (NOLOCK)
    LEFT OUTER JOIN sys.filegroups AS fg WITH (NOLOCK)
    ON f.data_space_id = fg.data_space_id"

    }
    
    process {
        
        foreach ($instance in $SqlInstance) {
            try {
                Write-Message -Level VeryVerbose -Message "Connecting to $instance" -Target $instance
                $server = Connect-SqlInstance -SqlInstance $instance -SqlCredential $SqlCredential
            }
            catch {
                Stop-Function -Message "Failed to process Instance $Instance" -ErrorRecord $_ -Target $instance -Continue
            }
            
            if ($server.VersionMajor -lt 9) {
                Write-Message -Level Warning -Message "SQL Server 2000 not supported. $server skipped."
                continue
            }
            
            #If IncludeSystemDBs is true, include systemdbs
            #look at all databases, online/offline/accessible/inaccessible and tell user if a db can't be queried.
            try {
                if (Test-Bound "Database") {
                    $dbs = $server.Databases | Where-Object Name -In $Database
                }
                elseif ($IncludeSystemDBs) {
                    $dbs = $server.Databases | Where-Object Status -eq 'Normal'
                }
                else {
                    $dbs = $server.Databases | Where-Object { $_.status -eq 'Normal' -and $_.IsSystemObject -eq 0 }
                }
                
                if (Test-Bound "ExcludeDatabase") {
                    $dbs = $dbs | Where-Object Name -NotIn $ExcludeDatabase
                }
            }
            catch {
                Stop-Function -Message "Unable to gather databases for $instance" -ErrorRecord $_ -Continue
            }
            
            foreach ($db in $dbs) {
                try {
                    Write-Message -Level Verbose -Message "Querying $instance - $db"
                    If ($db.status -ne 'Normal' -or $db.IsAccessible -eq $false) {
                        Write-Message -Level Warning -Message "$db is not accessible." -Target $db
                        continue
                    }
                    #Execute query against individual database and add to output
                    foreach ($row in ($db.ExecuteWithResults($sql)).Tables.Rows) {
                        If ($row.UsedSpaceMB -is [System.DBNull]) { $UsedMB = 0 }
                        Else { $UsedMB = [Math]::Round($row.UsedSpaceMB) }
                        If ($row.FreeSpaceMB -is [System.DBNull]) { $FreeMB = 0 }
                        Else { $FreeMB = [Math]::Round($row.FreeSpaceMB) }
                        If ($row.PercentUsed -is [System.DBNull]) { $PercentUsed = 0 }
                        Else { $PercentUsed = [Math]::Round($row.PercentUsed) }
                        If ($row.SpaceBeforeMax -is [System.DBNull]) { $SpaceUntilMax = 0 }
                        Else { $SpaceUntilMax = [Math]::Round($row.SpaceBeforeMax) }
                        If ($row.UnusableSpaceMB -is [System.DBNull]) { $UnusableSpace = 0 }
                        Else { $UnusableSpace = [Math]::Round($row.UnusableSpaceMB) }
                        
                        [pscustomobject]@{
                            ComputerName = $server.NetName
                            InstanceName = $server.ServiceName
                            SqlInstance = $server.DomainInstanceName
                            Database = $row.DBName
                            FileName = $row.FileName
                            FileGroup = $row.FileGroup
                            PhysicalName = $row.PhysicalName
                            FileType = $row.FileType
                            UsedSpaceMB = $UsedMB
                            FreeSpaceMB = $FreeMB
                            FileSizeMB = $row.FileSizeMB
                            PercentUsed = $PercentUsed
                            AutoGrowth = $row.GrowthMB
                            AutoGrowType = $row.GrowthType
                            SpaceUntilMaxSizeMB = $SpaceUntilMax
                            AutoGrowthPossibleMB = $row.PossibleAutoGrowthMB
                            UnusableSpaceMB = $UnusableSpace
                        }
                    }
                }
                catch {
                    Stop-Function -Message "Unable to query $instance - $db" -Target $db -ErrorRecord $_ -Continue
                }
            }
        }
    }
    
    end {
        Test-DbaDeprecation -DeprecatedOn "1.0.0" -Alias Get-DbaDatabaseFreeSpace 
    }
}