How do I enable cross-database queries in Azure SQL Database ?

Set up Elastic Queries: passwords in Key Vault, scoped credentials, external data source, then external tables per object.

What's the performance overhead of Elastic Queries in Azure SQL?

Network latency adds 10-50ms per query; avoid high-frequency joins.

Yes—drop external table, data source, credential (source db), then user (target db). Reverse order.

☁️ Cloud & Databases

Your Azure SQL databases share a server but won't talk? That's no bug—it's by design. Elastic Queries bridge the gap, but at a cost.

theAIcatchup Apr 09, 2026 3 min read

Azure SQL blocks three-part cross-db queries for security; use Elastic Queries as workaround. 𝕏
Setup involves Key Vault passwords, scoped credentials, and external tables—no data sync needed. 𝕏
Performance overhead makes it unsuitable for high-frequency operations; plan accordingly. 𝕏

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#Azure Key Vault #Azure SQL #Azure SQL Database #Elastic Queries #Elastic Query #cross-database queries #database credentials #external tables

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Originally reported by Dev.to