在现有数据库上恢复 Azure SQL 数据库以维护备份历史记录

Question

I'm setting up an Azure SQL DB for our Web App. We have enabled Point In Time Retention (PITR) and Long Term Retention (LTR). Our process is to keep backups for 1 year.

Periodically, we need to upgrade the DB by applying SQL scripts. Sometimes there is a problem with the upgrade scripts and the upgrade fails. We need to rollback the database to the previous version.

To rollback the DB I tried the restore feature. However, the restore feature seems to only create new DBs; therein lies the problem. Restoring to a new DB and removing the old one works great, but we lose all our backup history. It appears backups are tired to the DB (probably to the ResourceId).

So, how can I use Azure SQL DB and periodically restore a DB and still maintain all the back up history?

Answer 1

Unfortunately, restoring from a backup in Azure SQL Database always creates a new database. The secret here may be to rename the newly restored database with the name of the original database. You will even see that the restored database once renamed it then shows all the security recommendations, automatic tuning recommendations of the original database.

So delete existing database, restored the database, and rename it as the original database.

Answer 2

You can reference this document Recover an Azure SQL database using automated database backups , it gives the answer that all the recover are creating new database.

By default, SQL Database backups are stored in geo-replicated blob storage (RA-GRS). The following options are available for database recovery using automated database backups: Create a new database on the same SQL Database server recovered to a specified point in time within the retention period.

• Create a database on the same SQL Database server recovered to the deletion time for a deleted database.
• Create a new database on any SQL Database server in the same region recovered to the point of the most recent backups.
• Create a new database on any SQL Database server in any other region recovered to the point of the most recent replicated backups.

If you configured backup long-term retention, you can also create a new database from any LTR backup on any SQL Database server.

improtant :

You cannot overwrite an existing database during restore.

"So, how can I use Azure SQL DB and periodically restore a DB and still maintain all the back up history?"

You can use Database replacement :

If the restored database is intended as a replacement for the original database, you should specify the original database's compute size and service tier. You can then rename the original database and give the restored database the original name using the ALTER DATABASE command in T-SQL.

Hope this helps.