internal/Get-FilteredRestoreFile.ps1
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#ValidationTags#Messaging,FlowControl,Pipeline,CodeStyle# function Get-FilteredRestoreFile { <# .SYNOPSIS Internal Function to Filter a set of SQL Server backup files .DESCRIPTION Takes an array of FileSystem Objects and then filters them down by date to get a potential Restore set First step is to pass them to a SQLInstance to be parsed with Read-DBABackupHeader The we find the last full backup before the RestorePoint. Then filter for and Diff backups between the full backup and the RestorePoint Tnen find the T-log backups needed to bridge the gap up until the RestorePoint .PARAMETER Files The files to filter .PARAMETER SqlInstance The Sql Instance from which the backup headers are retrieved for comparison. .PARAMETER RestoreTime The time constraint between backup time and up to when the transaction logs are retrieved. .PARAMETER SqlCredential The Password to connect to the Sql Instance with. .PARAMETER IgnoreLogBackup Whether the transaction logs should be ignored. .PARAMETER TrustDbBackupHistory Whether to trust the database backup history. .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. .PARAMETER Continue Continues restoring a database from a point in time .PARAMETER ContinuePoints The points to continue the restore from .PARAMETER DatabaseName Used when a restore is being continued with a name change .EXAMPLE Get-FilteredRestoreFile -Files $Files -SqlInstance $SqlInstance Filters out the backupfiles when compared to that sql instance's backup heades. .NOTES Additional information about the function. #> [CmdletBinding()] Param ( [parameter(Mandatory = $true, ValueFromPipeline = $true)] [object[]] $Files, [Alias('SqlServer')] [parameter(Mandatory = $true)] [DbaInstanceParameter] $SqlInstance, [DateTime] $RestoreTime = (Get-Date).AddYears(1), [System.Management.Automation.PSCredential] $SqlCredential, [switch] $IgnoreLogBackup, [switch] $TrustDbBackupHistory, [switch] [Alias('Silent')]$EnableException, [switch] $Continue, [object] $ContinuePoints, [string] $DatabaseName, [string] $AzureCredential ) begin { Write-Message -Level InternalComment -Message 'Starting' Write-Message -Level Debug -Message "Bound parameters: $($PSBoundParameters.Keys -join ", ")" $sqlInstanceParameterSplat = @{ SqlInstance = $SqlInstance } if ($SqlCredential) { $sqlInstanceParameterSplat["SqlCredential"] = $SqlCredential } $allSqlBackupDetails = @() $outResults = @() $internalFiles = @() } process { foreach ($file in $files) { $internalFiles += $file } } end { if ($TrustDbBackupHistory) { Write-Message -Level Verbose -Message "Processing trusted backup history" $tmpInternalFiles = @() foreach ($row in $internalFiles) { if ($row.FullName.Count -gt 1) { foreach ($filename in $row.FullName) { $newIF = $row | Select-Object * $NewIf.fullName = $filename.ToString() $NewIf.BackupPath = $filename.ToString() $tmpInternalFiles += $NewIf } } else { $tmpInternalFiles += $row } } $internalFiles = $tmpInternalFiles $allSqlBackupDetails += $internalFiles | Where-Object { $_.Type -eq 'Full' } | select-object *, @{ Name = "BackupTypeDescription"; Expression = { "Database" } }, @{ Name = "BackupType"; Expression = { "1" } } $allSqlBackupDetails += $internalFiles | Where-Object { $_.Type -eq 'Log' } | select-object *, @{ Name = "BackupTypeDescription"; Expression = { "Transaction Log" } }, @{ Name = "BackupType"; Expression = { "2" } } $allSqlBackupDetails += $internalFiles | Where-Object { $_.Type -eq 'Differential' } | select-object *, @{ Name = "BackupTypeDescription"; Expression = { "Database Differential" } }, @{ Name = "BackupType"; Expression = { "5" } } } else { Write-Message -Level Verbose -Message "Read File headers (Read-DBABackupHeader)" $AllSQLBackupdetails = $InternalFiles | ForEach-Object{if($_.fullname -ne $null){$_.Fullname}else{$_}} | Read-DBAbackupheader -sqlinstance $sqlinstance -SqlCredential $SqlCredential -AzureCredential $AzureCredential } Write-Message -Level Verbose -Message "$($AllSQLBackupdetails.count) Files to filter" $Databases = $AllSQLBackupdetails | Group-Object -Property Servername, DatabaseName Write-Message -Level Verbose -Message "$(($Databases | Measure-Object).count) database to process" if ($Continue) { IF ($DatabaseName -ne '') { if (($Databases | Measure-Object).count -gt 1) { Stop-Function -Message "More than 1 db restore for 1 db - exiting" return } else { $dbrec = $DatabaseName } } else { Write-Message -Level Verbose -Message "Continue set, so filtering to these databases :$($continuePoints.Database -join ',')" #$ignore = $Databases | Where-Object {$_.DatabaseName -notin ($continuePoints.Database)} | select-Object DatabaseName #Write-Verbose "Ignoring these: $($ignore -join ',')" $Databases = $Databases | Where-Object {$_.Values[1] -in ($continuePoints.Database)} } } foreach ($Database in $Databases) { $Results = @() Write-Message -Level VeryVerbose -Message "Find Newest Full backup - $($_.DatabaseName)" $ServerName, $databaseName = $Database.Values Write-verbose "dbname = $databasename" $SQLBackupdetails = $AllSQLBackupdetails | Where-Object {$_.ServerName -eq $ServerName -and $_.DatabaseName -eq $DatabaseName} #If we're continuing a restore, then we aren't going to be needing a full backup.... $TlogStartlsn = 0 if (!($continue)) { $Fullbackup = $SQLBackupdetails | where-object {$_.BackupTypeDescription -eq 'Database' -and $RestoreTime -ge $_.BackupStartDate} | Sort-Object -Property LastLSN -descending | Select-Object -First 1 $TlogStartlsn = $Fullbackup.LastLsn if ($Fullbackup -eq $null) { Stop-Function -Message "No Full backup found to anchor the restore" -Continue -Target $database break } #This scans for striped full backups to build the results $Results += $SQLBackupdetails | where-object {$_.BackupTypeDescription -eq "Database" -and $_.FirstLSN -eq $FullBackup.FirstLSN -and $_.BackupSetGUID -eq $FullBackup.BackupSetGUID} } else { Write-Message -Level VeryVerbose -Message "Continuing restore, setting fake fullbackup" if ($null -ne $dbrec) { $dbfilter = $dbrec } else { $dbfilter= $DatabaseName } $Fullbackup = $ContinuePoints | Where-Object {$_.Database -eq $dbfilter} $TLogStartLsn = $Fullbackup.redo_start_lsn } Write-Message -Level Verbose -Message "Got a Full backup, now to find diffs if they exist" #Get latest Differential Backup #If we're doing a continue and the last restore wasn't a full db we can't use a diff, so skip if ($null -eq $lastrestore -or $lastrestore -eq 'Database' ) { $DiffbackupsLSN = ($SQLBackupdetails | Where-Object {$_.BackupTypeDescription -eq 'Database Differential' -and $_.DatabaseBackupLSN -eq $Fullbackup.CheckpointLsn -and $_.BackupStartDate -lt $RestoreTime} | Sort-Object -Property LastLSN -descending | Select-Object -First 1).FirstLSN #Scan for striped differential backups $Diffbackups = $SqlBackupDetails | Where-Object {$_.BackupTypeDescription -eq 'Database Differential' -and $_.DatabaseBackupLSN -eq $Fullbackup.CheckpointLsn -and $_.FirstLSN -eq $DiffBackupsLSN} if ($null -ne $Diffbackups) { Write-Message -Level Verbose -Message "we have at least one diff so look for tlogs after the last one" #If we have a Diff backup, we only need T-log backups post that point $TlogStartLSN = ($DiffBackups | select-object -Property LastLsn -first 1).LastLsn $Results += $Diffbackups } } if ($fullBackup.RecoverModel -eq 'SIMPLE' -or $IgnoreLogBackup) { Write-Message -Level Verbose -Message "Database in simple mode or IgnoreLogBackup is true, skipping Transaction logs" -Target $database } else { write-verbose " frfID - $($Fullbackup.FirstRecoveryForkID)" write-verbose "tstart - $TlogStartLSN" Write-Message -Level Verbose -Message "Got a Full/Diff backups, now find all Tlogs needed" $AllTlogs = $SQLBackupdetails | Where-Object {$_.BackupTypeDescription -eq 'Transaction Log'} $Filteredlogs = $SQLBackupdetails | Where-Object {$_.BackupTypeDescription -eq 'Transaction Log' -and $_.FirstRecoveryForkID -eq $Fullbackup.FirstRecoveryForkID -and $_.LastLSN -ge $TlogStartLSN -and $_.BackupStartDate -lt $RestoreTime} # -and $_.BackupStartDate -ge $LogStartDate $GroupedLogs = $FilteredLogs | Group-Object -Property LastLSN, FirstLSN $Tlogs = @() foreach ($LogGroup in $GroupedLogs) { $Tlogs += $LogGroup.Group | Where-Object {$_.BackupSetGUID -eq ($LogGroup.Group | sort-Object -Property BackupStartDate -Descending | select-object -first 1).BackupSetGUID} } Write-Message -Level SomewhatVerbose -Message "Filtered $($allTlogs.count) log backups down to $($tLogs.count)" -Target $database $results += $tLogs #Catch the last Tlog that covers the restore time! $tLogfinal = $sqlBackupdetails | Where-Object { $_.BackupTypeDescription -eq 'Transaction Log' -and $_.BackupStartDate -gt $RestoreTime } | Sort-Object -Property LastLSN | Select-Object -First 1 $results += $tLogfinal $tLogCount = ($results | Where-Object { $_.BackupTypeDescription -eq 'Transaction Log' }).count Write-Message -Level SomewhatVerbose -Message "$tLogCount Transaction Log backups found" -Target $database } [PSCustomObject]@{ ID = $databaseName Values = $results } } Write-Message -Level InternalComment -Message 'Stopping' } } |