PowerShell script to restore TRN into Standby readonly SQL2008R2 database

restore-logs.ps1

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## henk meulekamp - 2012-09-14
## Script to restore transaction log (.TRN files) into office readonly copy

$logBackupFolder="D:\sshRoot"
$server = "smtpserver"
$toemail ="monitor email"
$fromemail ="sender email"
$nl = [Environment]::NewLine
##Variable for time duration - the amount of time you need to generate and restore LOG backups
$LookBackPeriod = [DateTime]::Now.AddHours(-12)

##Retrieve folders and files in the specified directory
foreach ($databaseName in (Get-ChildItem $logBackupFolder | Where { $_.PsIsContainer }) )
{
     foreach ($logName in (Get-ChildItem $logBackupFolder\$databasename\Log | where {($_.CreationTime -ge $LookBackPeriod) -and ($_.Extension -eq ".trn")} | SELECT name))
     {
          $logBackupPath = [System.String]::Concat("'$logBackupFolder\",$databasename,"\Log\",$logName.Name,"'")
              
          Try
          {
               $logBackupPathStandby = [System.String]::Concat("'D:\SQLServerfiles\MSSQL10_50.MSSQLSERVER\MSSQL\Backup\ROLLBACK_UNDO_",$databasename,".bak'")
               $logFile = [System.String]::Concat("D:\Tools\sql\Log\",$logName.Name)
         
               ##write restore file
               ##first set db to offline and back to online, this will kick out all connections. We restore to readonly db, so this shouldnt be an issue
               [System.String]::Concat("ALTER DATABASE ",$databaseName  ," set offline with rollback immediate") | Out-File D:\Tools\sql\$databaseName.sql
               "GO" | Out-File D:\Tools\sql\$databaseName.sql -append
               "print cast(getdate() as varchar(50))" | Out-File D:\Tools\sql\$databaseName.sql -append
               "GO" | Out-File D:\Tools\sql\$databaseName.sql -append
               [System.String]::Concat("ALTER DATABASE ",$databaseName  ," set online") | Out-File D:\Tools\sql\$databaseName.sql -append
               "GO" | Out-File D:\Tools\sql\$databaseName.sql -append              
               $restoreSQL = "RESTORE LOG $databaseName FROM DISK=$logBackupPath WITH  FILE = 1, STANDBY= $logBackupPathStandby, NOUNLOAD,  STATS = 10" | Out-File D:\Tools\sql\$databaseName.sql -append
               "GO" | Out-File D:\Tools\sql\$databaseName.sql -append
                             
               ##this line will crash the process if file already exists.. meaning we already restored this trn
               Get-Date | Out-File $logFile -noClobber -encoding "UTF8"
              
               ##invoke restore command and write output to logfile
               write-host -foregroundcolor Green "starting restore process"
               Invoke-Expression "sqlcmd.exe -Slocalhost -iD:\Tools\sql\$databaseName.sql" | Out-File $logFile         
              
               ##show done
               $logdone = [System.String]::Concat("Processed backup file: ", $logBackupPath)
               $logdone
               $logdone | Out-File $logFile -append
              
               ##Pause for 3 seconds; seems that the log file needs this?
               write-host -foregroundcolor Green "Pause for 3 seconds before emailling logfile"
               Start-Sleep -s 3

               ##import logfile content into body to be emailed
               $body = "$(cat $logFile)"
               ##Email the report.
               Send-MailMessage -smtpServer $server -to $toemail -from $fromemail -subject "Report DB Daily Office Import" -body $body
          }
          Catch [system.IO.IOException]
          {
               $log = [System.String]::Concat("We already did this file: ", $logBackupPath)
               write-host -foregroundcolor Red $log
          }
          Catch
          {
              ##send crash to monitoring
               Send-MailMessage -smtpServer $server -to $toemail -from $fromemail -subject "FAILED - Report DB Daily Office Import" -body "Import script crashed"
          }
          ##dont catch other exceptions, those need to break the script
     }
}