Hi Sukhen Tiwari •,
Welcome to Microsoft Q&A forum and thanks for using Azure Services.
As I understand, you want to know about migration of Database from one Azure Subscription to another.
Please follow the below links:
For Azure Cosmos DB, I would recommend you to go through the link https://learn.microsoft.com/en-us/azure/azure-resource-manager/management/move-support-resources#microsoftdocumentdb.
For MySQL SQL, refer to https://techcommunity.microsoft.com/t5/azure-architecture-blog/migrate-large-azure-mysql-between-subscriptions/ba-p/1781923
For SQL Server, refer to:
Option 1: PITR restore method -
Step 1: Create new server in source subscription
Step 2 : Copy the database from source server to newly created server within the same subscription
step 3 : move the entire server to the destination subscription along with the database
step 4: now again copy the database from moved server between the servers within destination server
Ref: Move server https://techcommunity.microsoft.com/t5/azure-database-support-blog/how-to-move-azure-sql-server-to-another-subscription/ba-p/368790
Ref Copy database: https://learn.microsoft.com/en-us/azure/azure-sql/database/database-copy?tabs=azure-powershell
Option 2: .bacpac restore method / export-import method
You can also use export import method
Step 1: Export the source database in .bacpac format and store it into the storage account / local storage
Step 2 : Import the bacpac into destination server
Ref :
Export - https://learn.microsoft.com/en-us/azure/azure-sql/database/database-export
Import- https://learn.microsoft.com/en-us/azure/azure-sql/database/database-import?tabs=azure-powershell
Blog: https://www.mssqltips.com/sqlservertip/5189/restore-an-azure-sql-database-from-one-server-to-another-server/
Option 3: Direct copy the database to another subscription
Copy the database directly to the different subscription. Please note this method is not supported via azure portal.
Ref: https://learn.microsoft.com/en-us/azure/azure-sql/database/database-copy?tabs=azure-powershell#copy-to-a-different-subscription
QnA: https://learn.microsoft.com/en-us/answers/questions/610126/how-to-copy-azure-sql-database-to-another-subscrip.html
For Oracle, refer https://learn.microsoft.com/en-us/answers/questions/1378061/how-to-migrate-oracle-database-rman-backup-from-on
Hope this helps.
Let us know if you have further queries, thanks.