Check whether Azure SQL database has been fully removed - azure

Question

I am creating a simple Azure logic app that uses a function to:
Delete a slave database
Restore a copy of a master database (with the same name as the removed slave)
Remove Database
# Remove slave database
Remove-AzSqlDatabase `
-DatabaseName $RestoreDatabaseName `
-ServerName $ServerName `
-ResourceGroupName $ResourceGroupName
Write-Host "Removed slave database"
Restore PIT Backup of Master
# Restore database
Restore-AzSqlDatabase `
-FromPointInTimeBackup `
-PointInTime (Get-Date).AddMinutes(-2) `
-ResourceGroupName $ResourceGroupName `
-ServerName $ServerName `
-TargetDatabaseName $RestoreDatabaseName `
-ResourceId $Database.ResourceID `
-ElasticPoolName $ElasticPoolName
The issue i am having is that after removing the database, Azure still sees the database on the server and so i get the following error when restoring:
The destination database name 'Slave' already exists on the server
'server address'.
I cant find any way to check if this has been fully removed before starting the next function. Any help on how to achieve this would be greatly appreciated.

Answer 1

You can use Get-AzSqlDatabase to check if the DB is still in play.
Get-AzSqlDatabase -ResourceGroupName "ResourceGroup01" -ServerName "Server01" -DatabaseName "Database02"
Placing this in a loop with a sleep will give you a poll to check when the DB is finally gone for good and you can then resume your processing.
Start-Sleep -s 15
Make sure you have a circuit breaker in your logic to prevent and endless loop in the case of a failed deletion.
It may be easier to restore your DB with a new name to avoid the delay e.g. MyDb<yyyymmdd>
Or alternatively, use the Azure REST API from SQL DB delete.
DELETE https://management.azure.com/subscriptions/00000000-1111-2222-3333-444444444444/resourceGroups/Default-SQL-SouthEastAsia/providers/Microsoft.Sql/servers/testsvr/databases/testdb?api-version=2017-10-01-preview
and monitor the location response of the 204 Accepted to determine when the database has been completely removed. Azure Durable Functions give you a great monitor pattern you can use.