PowerShell 1.0: Backup and Restore a Database Between Two SQL 2005 Servers

My technical partner-in-crime, Brandon, created this PowerShell script last year in an effort to help him understand PowerShell a bit more. He noted that while it may not all be best practices SQL-wise, he tried his best to use as much PowerShell as possible.

Backup and Restore

#Powershell to backup and restore a SQL database from server1 to server2.
#2008, Brandon Abshire / netnerds.net

#load assemblies
[System.Reflection.Assembly]::LoadWithPartialName("Microsoft.SqlServer.SMO")  | out-null

# create source and destination sql servers
$s = new-object ('Microsoft.SqlServer.Management.Smo.Server') 'server1'
$d = new-object ('Microsoft.SqlServer.Management.Smo.Server') 'server2'
# set backup directory, dbname and grab date
$bkdir = 'e:\'
$remoteDir = 'e$\'
$dbname = 'databasename'
$dt = get-date -format yyyyMMddHHmmss

#create backup object and set properties
$dbbk = new-object ('Microsoft.SqlServer.Management.Smo.Backup')
$dbbk.Action = 0
$dbbk.BackupSetDescription = "Backup of " + $dbname
$dbbk.BackupSetName = $dbname + " Backup"
$dbbk.Database = $dbname
$dbbk.Devices.AddDevice($bkdir + "\" + $dbname + $dt + ".bak", 2)
$dbbk.MediaDescription = "Disk"
$dbbk.Incremental = $false

#Backup the database
$dbbk.SqlBackup($s)

#create restore object and set properties.
$dbres = New-Object ('Microsoft.SqlServer.Management.Smo.Restore')
$dbres.Database = $dbname
$dbres.Action = 0
$dbres.ReplaceDatabase = $true

#Add the backup that is on the remote server by whatever method you wish.
#You can copy it locally first.  I just used named pipes to grab it off the network, since it is a fast enough connection.

$dbres.Devices.AddDevice("\\" + $s + "\" + $remoteDir + $dbname + $dt + ".bak", 2)
$dbres.NoRecovery = $false

#Without the KillAll, my restore got stuck in "Restoring..." forever.
$d.KillAllProcesses('databasename')

#restore the database.
$dbres.SqlRestore($d)

#The database is now restored from one server to another.
#We must re-map the mappings on the database for my user, or login will fail.

#Set db to the specific database we want on the destination server.
$db = $d.databases["databasename"]

#Set newUser to the user we want to give permissions to and drop it.
#This user was restored from the other database and doesn't match up
#to the one on the destination SQL server.
#sp_change_users_login 'autofix','userlogin' could also be used but I
#wanted to practice PS moreso than SQL

$newuser = $db.users["username"]
$newuser.drop()

#Create a new user.  Set the parent to the database we restored.
$newuser = New-Object ('Microsoft.SqlServer.Management.Smo.User')
$newuser.parent = $db

#Set the username and login name.
$newuser.name = "My User"
$newuser.login = "username"

#Set the default Schema, create the user and add the appropriate roles.
$newuser.defaultSchema = "dbo"
$newuser.Create()
$newuser.AddToRole("db_datareader")
$newuser.AddToRole("db_datawriter")

Credit goes out to the Allen White, MVP of the MSDN Forums for a PowerShell/SQL quickstart.

Chrissy is a PowerShell MVP who has worked in IT for nearly 20 years, and currently serves as a Sr. Database Engineer in Belgium. Always an avid scripter, she attended the Monad session at Microsoft’s Professional Developers Conference in Los Angeles back in 2005 and has worked and played with PowerShell ever since. Chrissy is currently pursuing an MS in Systems Engineering at Regis University and helps maintain RealCajunRecipes.com in her spare time. She holds a number of certifications, including those relating to SQL Server, SuSE Linux, SharePoint and network security. She recently became co-lead of the SQL PASS PowerShell Virtual Chapter. You can follow her on Twitter at @cl.

Posted in PowerShell, SQL Server
2 comments on “PowerShell 1.0: Backup and Restore a Database Between Two SQL 2005 Servers
  1. robert says:

    I can't seem to find a powershell script to create a new user on a server. Can you provide some help?

    thanx

  2. kasi says:

    getting following error while restoring db

    Exception calling "SqlRestore" with "1" argument(s): "Restore failed for Server 'SRSDEV_KASI'. "
    At :line:59 char:17
    + $dbres.SqlRestore <<<< ($d)

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