-> I am trying to restore a Copy_Only database backup taken on Azure SQL Managed Instance JBMI-Pub to another Azure SQL Managed instance JBMI-Sub.

-> Please check this article on how to perform Copy_Only backup on an Azure SQL Managed Instance.

-> The copy_only backup for Managed Instance JBMI-Pub is placed on a storage account. Lets try a restore on Managed Instance JBMI-Sub as below,

-> Sign into the Azure portal after clicking Add,

TITLE: Microsoft SQL Server Management Studio

Restore of database ‘JBDB’ failed. (Microsoft.SqlServer.Management.RelationalEngineTasks)

ADDITIONAL INFORMATION:
System.Data.SqlClient.SqlError: Cannot find server asymmetric key with thumbprint ‘0xB48BED6BFEC0D4E9E8B1E9542A50F5225B6F6045’. (Microsoft.SqlServer.SmoExtended)

For help, click: https://go.microsoft.com/fwlink?ProdName=Microsoft+SQL+Server&ProdVer=16.100.41011.9+(SqlManagementObjects-master-APPLOCAL)&LinkId=20476

BUTTONS:
OK

-> Tried executing the restore command as a TSQL and got same error as below,

Msg 33111, Level 16, State 4, Line 2
Cannot find server asymmetric key with thumbprint ‘0xB48BED6BFEC0D4E9E8B1E9542A50F5225B6F6045’.
Msg 3013, Level 16, State 1, Line 2
RESTORE DATABASE is terminating abnormally.

-> The restore failure is due to the fact that Transparent Data Encryption (TDE) is enabled on Managed Instances JBMI-Pub and JBMI-Sub with different keys.

-> Lets change the TDE option for Managed Instance JBMI-Sub where we are restoring the backup from Service-Managed key to Customer-managed key and use the same key as Managed Instance JBMI-Pub from where copy_only backup was performed.

-> Make sure we select the same key vault, key and version for Managed Instance JBMI-Sub which is same as JBMI-Pub.

-> Click Save and start the restore again,

-> Restore completed fine this time.

Thank You,
Vivek Janakiraman

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