Hybrid Cloud Databases — Complete Guide
Hybrid Cloud Databases — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of SQL Server Tutorial on Toolliyo Academy.
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SQL Server Tutorial · Lesson 88 of 100
Hybrid Cloud Databases
SQL basics ✓ → Queries ✓ → Advanced
Advanced · 3 — Procedures · ~10 min · SQL — 2022 & Cloud
What is this?
Hybrid means some databases on-prem and some in Azure, often linked with sync, AGs spanning, or application failover.
Why should you care?
Regulated data may stay on-prem while digital channels use Azure SQL.
See it live — copy this example
Run in SQL Server Management Studio (SSMS) or Azure Data Studio.
-- Linked server sketch (on-prem talking to Azure)
-- EXEC sp_addlinkedserver @server='AzureDataVerse', @srvproduct='', @provider='SQLNCLI', @datasrc='your.database.windows.net';
SELECT name, is_linked FROM sys.servers;
-- Prefer application-level dual writes/sync over fragile linked servers when possibleWhat happened?
- sys.servers lists linked servers.
- Hybrid designs need clear ownership of truth and network security — linked servers are one tool, not always the best.
Practice next
- Document which data stays on-prem and why.
- Choose sync pattern (AG, replication, app sync, Data Factory).
- Secure endpoints with private connectivity.
- Map Orders cloud vs Customers on-prem in a diagram.
- List DNS/private endpoint needs.
Remember
Hybrid splits placement by constraint. Pick one source of truth per entity. Secure the wire.
Bank hybrid
Core ledger on-prem; mobile profile DB on Azure SQL.
Outcome: Compliance satisfied; app uses clear service boundaries.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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