functions/Read-DbaBackupHeader.ps1
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function Read-DbaBackupHeader { <# .SYNOPSIS Reads and displays detailed information about a SQL Server backup. .DESCRIPTION Reads full, differential and transaction log backups. An online SQL Server is required to parse the backup files and the path specified must be relative to that SQL Server. .PARAMETER SqlInstance The target SQL Server instance or instances. .PARAMETER SqlCredential Login to the target instance using alternative credentials. Windows and SQL Authentication supported. Accepts credential objects (Get-Credential) .PARAMETER Path Path to SQL Server backup file. This can be a full, differential or log backup file. Accepts valid filesystem paths and URLs. .PARAMETER Simple If this switch is enabled, fewer columns are returned, giving an easy overview. .PARAMETER FileList If this switch is enabled, detailed information about the files within the backup is returned. .PARAMETER AzureCredential Name of the SQL Server credential that should be used for Azure storage access. .PARAMETER EnableException By default, when something goes wrong we try to catch it, interpret it and give you a friendly warning message. This avoids overwhelming you with "sea of red" exceptions, but is inconvenient because it basically disables advanced scripting. Using this switch turns this "nice by default" feature off and enables you to catch exceptions with your own try/catch. .NOTES Tags: DisasterRecovery, Backup, Restore Author: Chrissy LeMaire (@cl), netnerds.net Website: https://dbatools.io Copyright: (c) 2018 by dbatools, licensed under MIT License: MIT https://opensource.org/licenses/MIT .LINK https://dbatools.io/Read-DbaBackupHeader .EXAMPLE PS C:\> Read-DbaBackupHeader -SqlInstance sql2016 -Path S:\backups\mydb\mydb.bak Logs into sql2016 using Windows authentication and reads the local file on sql2016, S:\backups\mydb\mydb.bak. If you are running this command on a workstation and connecting remotely, remember that sql2016 cannot access files on your own workstation. .EXAMPLE PS C:\> Read-DbaBackupHeader -SqlInstance sql2016 -Path \\nas\sql\backups\mydb\mydb.bak, \\nas\sql\backups\otherdb\otherdb.bak Logs into sql2016 and reads two backup files - mydb.bak and otherdb.bak. The SQL Server service account must have rights to read this file. .EXAMPLE PS C:\> Read-DbaBackupHeader -SqlInstance . -Path C:\temp\myfile.bak -Simple Logs into the local workstation (or computer) and shows simplified output about C:\temp\myfile.bak. The SQL Server service account must have rights to read this file. .EXAMPLE PS C:\> $backupinfo = Read-DbaBackupHeader -SqlInstance . -Path C:\temp\myfile.bak PS C:\> $backupinfo.FileList Displays detailed information about each of the datafiles contained in the backupset. .EXAMPLE PS C:\> Read-DbaBackupHeader -SqlInstance . -Path C:\temp\myfile.bak -FileList Also returns detailed information about each of the datafiles contained in the backupset. .EXAMPLE PS C:\> "C:\temp\myfile.bak", "\backupserver\backups\myotherfile.bak" | Read-DbaBackupHeader -SqlInstance sql2016 | Where-Object { $_.BackupSize.Megabyte -gt 100 } Reads the two files and returns only backups larger than 100 MB .EXAMPLE PS C:\> Get-ChildItem \\nas\sql\*.bak | Read-DbaBackupHeader -SqlInstance sql2016 Gets a list of all .bak files on the \\nas\sql share and reads the headers using the server named "sql2016". This means that the server, sql2016, must have read access to the \\nas\sql share. .EXAMPLE PS C:\> Read-DbaBackupHeader -SqlInstance sql2016 -Path https://dbatoolsaz.blob.core.windows.net/azbackups/restoretime/restoretime_201705131850.bak -AzureCredential AzureBackupUser Gets the backup header information from the SQL Server backup file stored at https://dbatoolsaz.blob.core.windows.net/azbackups/restoretime/restoretime_201705131850.bak on Azure #> [Diagnostics.CodeAnalysis.SuppressMessageAttribute("PSAvoidUsingPlainTextForPassword", 'AzureCredential', Justification = "For Parameter AzureCredential")] [CmdletBinding()] param ( [parameter(Mandatory)] [DbaInstance]$SqlInstance, [PsCredential]$SqlCredential, [parameter(Mandatory, ValueFromPipeline)] [object[]]$Path, [switch]$Simple, [switch]$FileList, [string]$AzureCredential, [switch]$EnableException ) begin { foreach ($p in $Path) { Write-Message -Level Verbose -Message "Checking: $p" if ([System.IO.Path]::GetExtension("$p").Length -eq 0) { Stop-Function -Message "Path ("$p") should be a file, not a folder" -Category InvalidArgument return } } Write-Message -Level InternalComment -Message "Starting reading headers" try { $server = Connect-SqlInstance -SqlInstance $SqlInstance -SqlCredential $SqlCredential } catch { Stop-Function -Message "Error occurred while establishing connection to $instance" -Category ConnectionError -ErrorRecord $_ -Target $instance -Continue return } $getHeaderScript = { param ( $SqlInstance, $Path, $DeviceType, $AzureCredential ) #Copy existing connection to create an independent TSQL session $server = New-Object Microsoft.SqlServer.Management.Smo.Server $SqlInstance.ConnectionContext.Copy() $restore = New-Object Microsoft.SqlServer.Management.Smo.Restore if ($DeviceType -eq 'URL') { $restore.CredentialName = $AzureCredential } $device = New-Object Microsoft.SqlServer.Management.Smo.BackupDeviceItem $Path, $DeviceType $restore.Devices.Add($device) $dataTable = $restore.ReadBackupHeader($server) $null = $dataTable.Columns.Add("FileList", [object]) $null = $dataTable.Columns.Add("SqlVersion") $null = $dataTable.Columns.Add("BackupPath") foreach ($row in $dataTable) { $row.BackupPath = $Path $backupsize = $row.BackupSize $null = $dataTable.Columns.Remove("BackupSize") $null = $dataTable.Columns.Add("BackupSize", [dbasize]) if ($backupsize -isnot [dbnull]) { $row.BackupSize = [dbasize]$backupsize } $cbackupsize = $row.CompressedBackupSize if ($dataTable.Columns['CompressedBackupSize']) { $null = $dataTable.Columns.Remove("CompressedBackupSize") } $null = $dataTable.Columns.Add("CompressedBackupSize", [dbasize]) if ($cbackupsize -isnot [dbnull]) { $row.CompressedBackupSize = [dbasize]$cbackupsize } $restore.FileNumber = $row.Position <# Select-Object does a quick and dirty conversion from datatable to PS object #> $row.FileList = $restore.ReadFileList($server) | Select-Object * } $dataTable } } process { if (Test-FunctionInterrupt) { return } #Extract fullnames from the file system objects $pathStrings = @() foreach ($pathItem in $Path) { if ($null -ne $pathItem.FullName) { $pathStrings += $pathItem.FullName } else { $pathStrings += $pathItem } } #Group by filename $pathGroup = $pathStrings | Group-Object -NoElement | Select-Object -ExpandProperty Name $pathCount = ($pathGroup | Measure-Object).Count Write-Message -Level Verbose -Message "$pathCount unique files to scan." Write-Message -Level Verbose -Message "Checking accessibility for all the files." $testPath = Test-DbaPath -SqlInstance $server -Path $pathGroup #Setup initial session state $InitialSessionState = [System.Management.Automation.Runspaces.InitialSessionState]::CreateDefault() $defaultrunspace = [System.Management.Automation.Runspaces.Runspace]::DefaultRunspace #Create Runspace pool, min - 1, max - 10 sessions: there is internal SQL Server queue for the restore operations. 10 threads seem to perform best $runspacePool = [runspacefactory]::CreateRunspacePool(1, 10, $InitialSessionState, $Host) $runspacePool.Open() $threads = @() foreach ($file in $pathGroup) { if ($file -like 'http*') { $deviceType = 'URL' } else { $deviceType = 'FILE' } if ($pathCount -eq 1) { $fileExists = $testPath } else { $fileExists = ($testPath | Where-Object FilePath -eq $file).FileExists } if ($fileExists -or $deviceType -eq 'URL') { #Create parameters hashtable $argsRunPool = @{ SqlInstance = $server Path = $file AzureCredential = $AzureCredential DeviceType = $deviceType } Write-Message -Level Verbose -Message "Scanning file $file." #Create new runspace thread $thread = [powershell]::Create() $thread.RunspacePool = $runspacePool $thread.AddScript($getHeaderScript) | Out-Null $thread.AddParameters($argsRunPool) | Out-Null #Start the thread $handle = $thread.BeginInvoke() $threads += [pscustomobject]@{ handle = $handle thread = $thread file = $file deviceType = $deviceType isRetrieved = $false started = Get-Date } } else { Write-Message -Level Warning -Message "File $file does not exist or access denied. The SQL Server service account may not have access to the source directory." } } #receive runspaces while ($threads | Where-Object { $_.isRetrieved -eq $false }) { $totalThreads = ($threads | Measure-Object).Count $totalRetrievedThreads = ($threads | Where-Object { $_.isRetrieved -eq $true } | Measure-Object).Count Write-Progress -Id 1 -Activity Updating -Status 'Progress' -CurrentOperation "Scanning Restore headers: $totalRetrievedThreads/$totalThreads" -PercentComplete ($totalRetrievedThreads / $totalThreads * 100) foreach ($thread in ($threads | Where-Object { $_.isRetrieved -eq $false })) { if ($thread.Handle.IsCompleted) { $dataTable = $thread.thread.EndInvoke($thread.handle) $thread.isRetrieved = $true #Check if thread had any errors if ($thread.thread.HadErrors) { if ($thread.deviceType -eq 'FILE') { Stop-Function -Message "Problem found with $($thread.file)." -Target $thread.file -ErrorRecord $thread.thread.Streams.Error -Continue } else { Stop-Function -Message "Unable to read $($thread.file), check credential $AzureCredential and network connectivity." -Target $thread.file -ErrorRecord $thread.thread.Streams.Error -Continue } } #Process the result of this thread $dbVersion = $dataTable[0].DatabaseVersion $SqlVersion = (Convert-DbVersionToSqlVersion $dbVersion) foreach ($row in $dataTable) { $row.SqlVersion = $SqlVersion if ($row.BackupName -eq "*** INCOMPLETE ***") { Stop-Function -Message "$($thread.file) appears to be from a new version of SQL Server than $SqlInstance, skipping" -Target $thread.file -Continue } } if ($Simple) { $dataTable | Select-Object DatabaseName, BackupFinishDate, RecoveryModel, BackupSize, CompressedBackupSize, DatabaseCreationDate, UserName, ServerName, SqlVersion, BackupPath } elseif ($FileList) { $dataTable.filelist } else { $dataTable } $thread.thread.Dispose() } } Start-Sleep -Milliseconds 500 } #Close the runspace pool $runspacePool.Close() [System.Management.Automation.Runspaces.Runspace]::DefaultRunspace = $defaultrunspace } } |