How to Upgrade from SQL Server 2017 to SQL Server 2025

Organizations running SQL Server 2017 should already be planning their next upgrade cycle. Microsoft has announced that SQL Server 2017 reaches end of support on October 12, 2027, after which standard security updates and technical support will no longer be available. For many SMBs and mid-market organizations, this makes now the right time to evaluate the best SQL Server upgrade path from SQL Server 2017 to SQL Server 2025.

A successful SQL Server upgrade involves more than installing a newer version of the database platform. Organizations must evaluate application compatibility, infrastructure readiness, migration methods, security requirements, and business continuity objectives. Careful planning helps reduce operational risk while creating opportunities to modernize infrastructure, strengthen security controls, and improve long-term manageability.

This guide outlines the key considerations when planning a SQL Server 2017 to SQL Server 2025 migration.

Why Organizations Should Plan Their SQL Server Upgrade Early

Database platforms often support critical business applications, reporting systems, and operational workflows. Delaying upgrade planning can limit migration options and compress testing timelines.

Early planning allows organizations to:

• Assess application dependencies
• Review infrastructure requirements
• Identify security and compliance gaps
• Evaluate cloud modernization opportunities
• Reduce migration risk through testing

Organizations that begin planning well before end-of-support deadlines generally have greater flexibility when selecting upgrade strategies.

Sources:

• SQL Server 2017 Lifecycle
• SQL Server End of Support Overview

Supported Upgrade Paths for SQL Server 2025

One of the first steps in developing a SQL Server upgrade path is understanding Microsoft's supported upgrade options.

Verify Current Version and Edition

Before planning a migration, organizations should inventory:

• SQL Server versions
• SQL Server editions
• Operating systems
• Database compatibility levels
• Integrated applications

Not all upgrade scenarios follow the same process. Some environments may support direct upgrades, while others may require intermediate migration steps.

Review Microsoft's Supported Upgrade Matrix

Microsoft maintains a supported upgrade path matrix that outlines which SQL Server versions can be upgraded directly to SQL Server 2025.

Organizations should validate:

• Source version compatibility
• Edition compatibility
• Operating system support
• Application vendor requirements

Source: Supported Version and Edition Upgrades to SQL Server 2025

In-Place Upgrade Considerations

An in-place upgrade installs SQL Server 2025 directly onto the existing SQL Server instance while retaining databases and configuration settings.

Benefits of an In-Place Upgrade

Potential advantages include:

• Lower infrastructure costs
• Faster deployment timelines
• Simpler migration process
• Reduced hardware requirements

For smaller environments with limited complexity, an in-place upgrade may be a practical option.

Risks of an In-Place Upgrade

Organizations should also consider potential limitations:

• More difficult rollback procedures
• Increased risk if issues occur during upgrade
• Limited testing flexibility
• Potential application compatibility concerns

Because the original environment is modified during the process, recovery options may be more constrained than alternative migration approaches.

Side-by-Side Migration Considerations

Many organizations prefer a side-by-side migration strategy.

This approach involves building a separate SQL Server 2025 environment and migrating databases after testing has been completed.

Benefits of Side-by-Side Migration

Advantages often include:

• Reduced production risk
• More extensive testing opportunities
• Easier rollback options
• Improved migration control
• Ability to modernize infrastructure simultaneously

For business-critical applications, side-by-side migrations are often considered the lower-risk approach.

When Side-by-Side Migration Makes Sense

Organizations may benefit from this strategy when:

• Upgrading aging hardware
• Migrating to virtualized infrastructure
• Moving to Azure
• Supporting mission-critical workloads
• Modernizing security architectures

Although side-by-side migrations often require additional planning, they can significantly reduce operational disruption.

Backup and Restore Migration Strategies

Backup and restore methods continue to play an important role in many SQL Server migration projects.

Using Backup and Restore for Database Migration

This approach generally involves:

1. Creating validated backups
2. Restoring databases to SQL Server 2025
3. Performing testing and validation
4. Updating application connections

For many environments, backup and restore provides a familiar and reliable migration mechanism.

Validate Backup Integrity

Before beginning any migration effort, organizations should verify:

• Backup completion status
• Recovery procedures
• Recovery time objectives
• Recovery point objectives

Backup validation is an important component of both migration planning and cybersecurity resilience.

Testing Requirements for a Successful SQL Server Upgrade

Testing is often the most important phase of a SQL Server upgrade project.

Application Compatibility Testing

Organizations should validate:

• Business applications
• Third-party integrations
• Reporting systems
• Custom scripts
• Scheduled jobs

Even when SQL Server upgrades are technically supported, application dependencies may require additional validation.

Performance Testing

Compare:

• Query execution times
• Resource utilization
• Reporting performance
• User experience metrics

This helps ensure the upgraded environment delivers expected operational improvements.

Security Validation

Database modernization projects also provide an opportunity to review:

• Authentication methods
• Role-based access controls
• Encryption settings
• Audit configurations
• Identity integration

Organizations leveraging Microsoft 365 and Microsoft Entra ID should evaluate opportunities to strengthen identity security and administrative controls as part of the migration effort.

Rollback Planning and Risk Management

Every SQL Server upgrade plan should include a documented rollback strategy.

Define Rollback Criteria

Before migration begins, establish:

• Success criteria
• Failure thresholds
• Escalation procedures
• Recovery timelines

Clear decision points help teams respond effectively if unexpected issues occur.

Preserve Recovery Options

Rollback planning often includes:

• Retaining original infrastructure
• Maintaining validated backups
• Documenting recovery procedures
• Testing rollback processes

The goal is not to expect failure, but to reduce uncertainty if problems arise.

Cutover Strategy and Migration Execution

The final migration phase involves moving production workloads to SQL Server 2025.

Schedule the Cutover Carefully

Organizations should consider:

• Business operating hours
• Maintenance windows
• User communication plans
• Vendor availability
• Support resources

Proper scheduling helps minimize operational impact.

Validate After Go-Live

Following cutover, organizations should verify:

• Application functionality
• User access
• Performance benchmarks
• Backup operations
• Monitoring systems

A structured post-migration validation process helps identify and resolve issues before they affect business operations.

Should You Upgrade to SQL Server 2025 or Move to Azure?

Some organizations may determine that SQL Server 2025 is the best long-term solution.

Others may use the migration project as an opportunity to evaluate Azure-based alternatives.

SQL Server on Azure Virtual Machines

Azure Virtual Machines provide a familiar SQL Server experience while shifting infrastructure hosting to Azure.

Organizations retain responsibility for:

• Operating system management
• Patch management
• SQL administration

Source: Azure SQL IaaS vs PaaS Overview

Azure SQL Managed Instance

Azure SQL Managed Instance provides a managed platform-as-a-service option with high compatibility for SQL Server workloads.

Benefits include:

• Automated patching
• Automated backups
• Built-in high availability
• Reduced infrastructure management

Source: Azure SQL Managed Instance Overview

Organizations evaluating cloud modernization should compare operational requirements, management responsibilities, and long-term costs before selecting a migration destination.

FAQ

What is the best SQL Server upgrade path from SQL Server 2017 to SQL Server 2025?

The best SQL Server upgrade path depends on application dependencies, infrastructure requirements, risk tolerance, and business objectives. Many organizations choose a side-by-side migration because it provides greater testing flexibility and simpler rollback options.

Can I upgrade directly from SQL Server 2017 to SQL Server 2025?

Organizations should review Microsoft's supported upgrade matrix to determine whether their specific version and edition support a direct upgrade path to SQL Server 2025.

What is the difference between an in-place upgrade and a side-by-side migration?

An in-place upgrade updates the existing SQL Server environment. A side-by-side migration creates a separate SQL Server 2025 environment and migrates workloads after testing. Side-by-side migrations typically provide greater flexibility and lower operational risk.

How long does a SQL Server 2017 to SQL Server 2025 migration take?

Migration timelines vary based on database size, application complexity, testing requirements, and infrastructure changes. Small environments may require several weeks, while larger or highly integrated environments may take several months.

Should I move from SQL Server 2017 to SQL Server 2025 or Azure SQL?

The answer depends on your organization's cloud strategy, operational requirements, application compatibility, and long-term infrastructure goals. Both SQL Server 2025 and Azure SQL services can support modernization initiatives when properly aligned with business objectives.

When does SQL Server 2017 reach end of support?

SQL Server 2017 reaches end of support on October 12, 2027. Organizations should begin planning upgrades well before that date to allow sufficient time for assessment, testing, and migration.