Switch Azure SQL Provisioned to Serverless and back to Provisioned

Yes, for supported Azure SQL Database single databases, you can move between provisioned compute and serverless. The data is not lost by changing the compute tier.

However, plan for operational impact:

1. There can be a brief connection interruption during scaling/tier changes.

2. Applications should have retry logic.

3. Serverless can auto-pause if configured, so the first connection after pause can see resume latency.

4. Review min/max vCore settings so the database has enough floor capacity.

5. Test the change in a lower environment if the database is production critical.

So the switch is supported, but treat it like a compute/service tier change and schedule it with normal change-control expectations.