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Restore an existing dedicated SQL pool

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In this article, you learn how to restore an existing dedicated SQL pool in Azure Synapse Analytics using Azure portal, Synapse Studio, and PowerShell. This article applies to both restores and geo-restores.

Note

This guidance is for dedicated SQL pools in Azure Synapse workspaces only. For standalone dedicated SQL pools (formerly SQL DW), see Restore an existing dedicated SQL pool (formerly SQL DW).

Restore an existing dedicated SQL pool through the Synapse Studio

  1. Sign in to the Azure portal.

  2. Navigate to your Azure Synapse workspace.

  3. Under Getting Started -> Open Synapse Studio, select Open. Screenshot from Synapse Studio, showing the Open Synapse Studio box and Open link.

  4. On the left hand navigation pane, select Data.

  5. Select Manage pools.

  6. Select + New to create a new dedicated SQL pool in the Azure Synapse Analytics workspace.

  7. In the Additional Settings tab, select a Restore Point to restore from.

    If you want to perform a geo-restore, select the workspace and dedicated SQL pool that you want to recover.

  8. Select either Automatic Restore Points or User-Defined Restore Points.

    Screenshot from the Azure portal, Create SQL pool page, Additional settings page. For Restore point type, the Automatic restore points radio button is selected.

    • If the dedicated SQL pool doesn't have any automatic restore points, wait a few hours, or create a user defined restore point before restoring. For User-Defined Restore Points, select an existing one or create a new one.

    • If you want to restore a dedicated SQL pool from a different workspace, select New dedicated SQL pool from your current workspace. Under the Additional settings tab, find the Use existing data and select the Restore point option. As shown in the above screenshot, you can then select the Server or workspace name from which you can restore.

    • If you are restoring a geo-backup, select the workspace located in the source region and the dedicated SQL pool you want to restore.

    Note

    You cannot perform an in-place restore of a SQL pool with the same name as an existing pool. Regardless of the SQL pool being in the same workspace or a different workspace.

  9. Select Review + Create.

Restore an existing dedicated SQL pool through the Azure portal

  1. Sign in to the Azure portal.

  2. Navigate to the dedicated SQL pool that you want to restore from.

  3. At the top of the Overview page, select Restore.

    Screenshot from the Azure portal, showing the SQL pool overview page. The Restore button is highlighted.

  4. Select either Automatic Restore Points or User-Defined Restore Points.

    If the dedicated SQL pool doesn't have any automatic restore points, wait a few hours or create a user-defined restore point before restoring.

    If you want to perform a geo-restore, select the workspace and dedicated SQL pool that you want to recover.

  5. Select Review + Create.

Restore an existing dedicated SQL pool through PowerShell

  1. Open a PowerShell terminal.

  2. Connect to your Azure account and list all the subscriptions associated with your account.

  3. Select the subscription that contains the SQL pool to be restored.

  4. List the restore points for the dedicated SQL pool.

  5. Pick the desired restore point using the RestorePointCreationDate.

  6. Restore the dedicated SQL pool to the desired restore point using Restore-AzSynapseSqlPool PowerShell cmdlet.

  7. Verify that the restored dedicated SQL pool is online.

    
$SubscriptionName="<YourSubscriptionName>"
$ResourceGroupName="<YourResourceGroupName>"
$WorkspaceName="<YourWorkspaceNameWithoutURLSuffixSeeNote>"  # Without sql.azuresynapse.net
#$TargetResourceGroupName="<YourTargetResourceGroupName>" # uncomment to restore to a different workspace.
#$TargetWorkspaceName="<YourtargetWorkspaceNameWithoutURLSuffixSeeNote>"  
$SQLPoolName="<YourDatabaseName>"
$NewSQLPoolName="<YourDatabaseName>"

Connect-AzAccount
Get-AzSubscription
Select-AzSubscription -SubscriptionName $SubscriptionName

# list all restore points
Get-AzSynapseSqlPoolRestorePoint -ResourceGroupName $ResourceGroupName -WorkspaceName $WorkspaceName -Name $SQLPoolName
# Pick desired restore point using RestorePointCreationDate "xx/xx/xxxx xx:xx:xx xx"
$PointInTime="<RestorePointCreationDate>"

# Get the specific SQL pool to restore
$SQLPool = Get-AzSynapseSqlPool -ResourceGroupName $ResourceGroupName -WorkspaceName $WorkspaceName -Name $SQLPoolName
# Transform Synapse SQL pool resource ID to SQL database ID because currently the restore command only accepts the SQL database ID format.
$DatabaseID = $SQLPool.Id -replace "Microsoft.Synapse", "Microsoft.Sql" `
    -replace "workspaces", "servers" `
    -replace "sqlPools", "databases"

# Restore database from a restore point
$RestoredDatabase = Restore-AzSynapseSqlPool –FromRestorePoint -RestorePoint $PointInTime -ResourceGroupName $SQLPool.ResourceGroupName `
    -WorkspaceName $SQLPool.WorkspaceName -TargetSqlPoolName $NewSQLPoolName –ResourceId $DatabaseID -PerformanceLevel DW100c

# Use the following command to restore to a different workspace
#$TargetResourceGroupName = $SQLPool.ResourceGroupName # for restoring to different workspace in same resourcegroup 
#$RestoredDatabase = Restore-AzSynapseSqlPool –FromRestorePoint -RestorePoint $PointInTime -ResourceGroupName $TargetResourceGroupName `
#    -WorkspaceName $TargetWorkspaceName -TargetSqlPoolName $NewSQLPoolName –ResourceId $DatabaseID -PerformanceLevel DW100c

# Verify the status of restored database
$RestoredDatabase.status

Restore an existing dedicated SQL pool to a different subscription through PowerShell

When performing a cross-subscription restore, a dedicated SQL pool in an Azure Synapse workspace can only restore directly to a standalone dedicated SQL pool (formerly SQL DW). If it is required to restore a dedicated SQL pool in an Azure Synapse workspace to a workspace in the destination subscription, an additional restore step is required.

The following PowerShell example is similar to the previous, however there are three main differences:

  • After retrieving the SQL Pool object to be restored, the subscription context needs to be switched to the destination (or target) subscription name.
  • When performing the restore, use the Az.Sql modules instead of the Az.Synapse modules.
  • The below sample code has additional steps for restoring to an Azure Synapse workspace in the destination subscription. Uncomment the PowerShell commands as described in the sample.

Steps:

  1. Open a PowerShell terminal.

  2. Update Az.Sql Module to 3.8.0 (or greater) if on an older version using Update-Module. Otherwise it will cause failures. To validate your version via PowerShell:

    foreach ($i in (get-module -ListAvailable | ?{$_.name -eq 'az.sql'}).Version) { $version = [string]$i.Major + "." + [string]$i.Minor; if ($version -gt 3.7) {write-host "Az.Sql version $version installed. Prerequisite met."} else {update-module az.sql} }

  3. Connect to your Azure account and list all the subscriptions associated with your account.

  4. Select the subscription that contains the SQL pool to be restored.

  5. List the restore points for the dedicated SQL pool.

  6. Pick the desired restore point using the RestorePointCreationDate.

  7. Select the destination subscription in which the SQL pool should be restored.

  8. Restore the dedicated SQL pool to the desired restore point using Restore-AzSqlDatabase PowerShell cmdlet.

  9. Verify that the restored dedicated SQL pool (formerly SQL DW) is online.

  10. If the desired destination is a Synapse Workspace, uncomment the code to perform the additional restore step.

    1. Create a restore point for the newly created data warehouse.

    2. Retrieve the last restore point created by using the Select -Last 1 syntax.

    3. Perform the restore to the desired Azure Synapse workspace.

      $SourceSubscriptionName="<YourSubscriptionName>"
$SourceResourceGroupName="<YourResourceGroupName>"
$SourceWorkspaceName="<YourServerNameWithoutURLSuffixSeeNote>"  # Without sql.azuresynapse.net
$SourceSQLPoolName="<YourDatabaseName>"
$TargetSubscriptionName="<YourTargetSubscriptionName>"
$TargetResourceGroupName="<YourTargetResourceGroupName>"
$TargetServerName="<YourTargetServerNameWithoutURLSuffixSeeNote>"  # Without sql.azuresynapse.net
$TargetDatabaseName="<YourDatabaseName>"
#$TargetWorkspaceName="<YourTargetWorkspaceName>" # uncomment if restore to an Azure Synapse workspace is required

# Update Az.Sql module to the latest version (3.8.0 or above)
# Update-Module -Name Az.Sql -RequiredVersion 3.8.0

Connect-AzAccount
Get-AzSubscription
Select-AzSubscription -SubscriptionName $SourceSubscriptionName

# list all restore points
Get-AzSynapseSqlPoolRestorePoint -ResourceGroupName $SourceResourceGroupName -WorkspaceName $SourceWorkspaceName -Name $SourceSQLPoolName
# Pick desired restore point using RestorePointCreationDate "xx/xx/xxxx xx:xx:xx xx"
$PointInTime="<RestorePointCreationDate>"

# Get the specific SQL pool to restore
$SQLPool = Get-AzSynapseSqlPool -ResourceGroupName $SourceResourceGroupName -WorkspaceName $SourceWorkspaceName -Name $SourceSQLPoolName
# Transform Synapse SQL pool resource ID to SQL database ID because currently the restore command only accepts the SQL database ID format.
$DatabaseID = $SQLPool.Id -replace "Microsoft.Synapse", "Microsoft.Sql" `
    -replace "workspaces", "servers" `
    -replace "sqlPools", "databases"

# Switch context to the destination subscription
Select-AzSubscription -SubscriptionName $TargetSubscriptionName

# Restore database from a desired restore point of the source database to the target server in the desired subscription
$RestoredDatabase = Restore-AzSqlDatabase –FromPointInTimeBackup –PointInTime $PointInTime -ResourceGroupName $TargetResourceGroupName `
    -ServerName $TargetServerName -TargetDatabaseName $TargetDatabaseName –ResourceId $DatabaseID

# Verify the status of restored database
$RestoredDatabase.status

# uncomment below cmdlets to perform one more restore to push the SQL Pool to an existing workspace in the destination subscription
# # Create restore point
# New-AzSqlDatabaseRestorePoint -ResourceGroupName $RestoredDatabase.ResourceGroupName -ServerName $RestoredDatabase.ServerName `
#     -DatabaseName $RestoredDatabase.DatabaseName -RestorePointLabel "UD-001"
# # Gets the last restore point of the sql dw (will use the RestorePointCreationDate property)
# $RestorePoint = Get-AzSqlDatabaseRestorePoint -ResourceGroupName $RestoredDatabase.ResourceGroupName -ServerName $RestoredDatabase.ServerName `
#     -DatabaseName $RestoredDatabase.DatabaseName | Select -Last 1
# # Restore to destination synapse workspace
# $FinalRestore = Restore-AzSynapseSqlPool –FromRestorePoint -RestorePoint $RestorePoint.RestorePointCreationDate -ResourceGroupName $TargetResourceGroupName `
#     -WorkspaceName $TargetWorkspaceName -TargetSqlPoolName $TargetDatabaseName –ResourceId $RestoredDatabase.ResourceID -PerformanceLevel DW100c

Troubleshoot

A restore operation can result in a deployment failure based on a "RequestTimeout" exception.

Screenshot from resource group deployments dialog of a timeout exception.

This timeout can be ignored. Review the dedicated SQL pool page in the Azure portal and it might still have status of "Restoring" and eventually will transition to "Online".

Screenshot of SQL pool dialog with the status that shows restoring.

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