What is Azure SQL?
Azure SQL isn’t a single resource but a family of related SQL Server database services in Azure: Azure SQL Database (fully managed single and pooled databases, including the recommended Hyperscale service tier), Azure SQL Managed Instance (near-complete SQL Server compatibility), and SQL Server on Azure VMs (full control over the infrastructure).
All PaaS variants offer automatic patching, integrated backups, high availability, and scalability without managing dedicated database infrastructure. Azure SQL Database is also a multi-model database, supporting vector, graph, JSON, XML, and spatial data alongside relational data.
Core Features
- Automatic patching with a configurable maintenance window
- Point-in-time restore within the configured backup retention period
- Active geo-replication and failover groups for disaster recovery
- Intelligent performance tuning with Query Store and automatic index management
- Microsoft Defender for SQL for threat detection and vulnerability assessment
- Serverless compute option for variable workloads (General Purpose and Hyperscale)
- Hyperscale service tier with independently scalable compute and storage up to the multi-terabyte range
Typical Use Cases
SaaS applications: Multi-tenant databases with elastic pools for efficient resource utilization and easy scaling.
Enterprise modernization: Migration from on-premises SQL Server to Managed Instance with minimal application changes.
Large and fast-growing workloads: The Hyperscale tier suits databases with high storage needs and independently scalable compute and storage.
Development and test: Serverless tier for development environments that only consume compute resources when actually used.
Benefits
- No overhead for patching, backups, and infrastructure management
- Higher availability SLA when configured with zone redundancy
- Seamless integration with .NET, Microsoft Entra ID, and common Microsoft development tools
- Hybrid scenarios via Azure Hybrid Benefit and data sync features
Frequently Asked Questions
What is the difference between SQL Database and Managed Instance?
SQL Database is optimized for cloud-native applications and offers features like elastic pools and the Hyperscale tier. Managed Instance provides near-complete compatibility with on-premises SQL Server, including SQL Agent, cross-database queries, and CLR.
How does pricing work?
Azure SQL offers a vCore-based model (flexible, can be combined with Azure Hybrid Benefit) and an older DTU-based model (simpler, for smaller workloads). The serverless option scales automatically and pauses during inactivity. Reserved Capacity can lower costs compared to pay-as-you-go with multi-year commitments; exact discounts are documented on the official pricing page.
Can I migrate existing SQL Server databases?
Yes, Azure Database Migration Service enables online migrations with minimal downtime. For Managed Instance, nearly all SQL Server features are supported.
How secure is the data?
Data in transit is encrypted via TLS and data at rest via Transparent Data Encryption (TDE); Always Encrypted is available for data in use. Microsoft Defender for SQL detects SQL injection attempts and anomalous access behavior.
Integration with innFactory
As a Microsoft Solutions Partner, innFactory supports you with Azure SQL: architecture design, migration, performance optimization, and cost management.
Note: All product information on this page has been compiled with care, but is provided without guarantee and may be outdated or incomplete. Cloud services evolve rapidly — features, pricing, SLAs, and availability change frequently. Authoritative and up-to-date information can only be found on the official product page of Azure (official documentation). This page does not represent an offer by Azure.
