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Data Warehouse Migration & Modernisation With BoomData

Data Warehouse Migration & Modernisation: How To Do It Right

Sonia Johnson Jun 17 4 min read

Migrating to a modern data warehouse requires – especially one in the cloud – careful planning and a deep understanding of the business, its data and its systems. Whether you’re shifting from legacy on-prem systems, consolidating multiple data sources, or modernising your data platform with tools like Snowflake, Microsoft Fabric, or Databricks, success depends on how you plan and execute the data warehouse migration.

This is rarely a lift-and-shift job. Data warehouse migrations are complex projects that require strategic alignment, technical precision and rigorous governance. Here’s some tips on how to approach it the right way.

1. Start With A Clear Understanding Of Your Data Estate

Before you move anything, map out your current data landscape. Understand:

  • What data sources are feeding into your existing environment?
  • What’s structured vs. unstructured data?
  • Which datasets are actively used, which are obsolete?

Use this discovery phase to engage business users and analysts early. Their input helps prioritise what data should be migrated, archived or retired – setting the foundation for a leaner, more valuable data warehouse.

2. Assess & Clean Your Data Before The Move

Don’t bring legacy mess into your new environment. Run data profiling and quality assessments to uncover:

  • Inconsistent schemas.
  • Duplicate records.
  • Incomplete or inaccurate data.

This is the perfect time to apply business rules, fix known issues and set data quality thresholds. Clean data leads to faster data warehouse migrations, fewer downstream issues and more reliable reporting post-go-live.

3. Design The Right Data Warehouse Migration Strategy

There’s no one-size-fits-all approach. Choose a data warehouse migration strategy based on your risk tolerance, data volumes and business continuity needs:

  • Big Bang: Faster, but riskier. Best for smaller, well-understood datasets.
  • Phased Migration: More control, better for complex environments and ongoing operations.
  • Hybrid or Parallel Runs: Useful when you need to compare old and new outputs side-by-side before full cutover.

Each approach should be supported by a well-architected cloud data platform future-state design if you’re looking to modernise your data warehouse – covering everything from ingestion pipelines and staging layers to transformation logic and consumption zones.

4. Secure & Govern Data From The Start

Security and data governance must be designed into the migration, not tacked on after.

Use platforms like Microsoft Purview to manage metadata and ensure your governance model scales as your new data warehouse or data lakehouse evolves.

5. Don’t Migrate Alone – Automate What You Can

Leverage automation and modern tools to accelerate and de-risk the data warehouse migration:

  • Use data integration tools for ETL/ELT automation.
  • Apply schema comparison and data validation scripts.
  • Automate testing and reconciliation across environments.

This not only speeds up the process but also provides consistency and auditability, critical for enterprise environments.

6. Test Early, Test Often & With Real Data

Thorough testing isn’t optional. Move beyond unit tests:

  • Perform test migrations with production-sized datasets.
  • Validate row counts, aggregations and report outputs.
  • Stress test performance under typical loads.

If business users rely on analytics, BI dashboards or regulatory reporting, simulate these workloads before go-live.

7. Audit & Optimise Post Go-Live

Once your new data warehouse migration is complete and your new environment is live, don’t assume the job is done. Monitor and audit:

  • Data completeness and freshness.
  • Query performance and compute costs.
  • User adoption and feedback.

Use this post-migration phase to fine-tune data models, indexing and permissions. Establish ongoing monitoring to ensure the data warehouse remains performant and secure over time.

8. Plan For Long-Term Data Governance & Scalability

A modern data warehouse isn’t static, it’s a living ecosystem, so it’s important to build processes for:

  • Continuous data quality monitoring.
  • Schema evolution and versioning.
  • Scalable ingestion from new sources.

Good data governance keeps your data warehouse from turning into another silo and supports sustainable growth across departments.

Partnering For Success: Why Expertise Matters

Even with strong internal capabilities, having an experienced data warehouse migration partner can reduce risk, compress timelines and uncover best practices you might otherwise miss.

At BoomData, we specialise in modern data warehouse solutions using platforms like Snowflake, Microsoft Fabric, Azure Synapse and Databricks. Whether you’re migrating from SQL Server, Oracle, or another data platform or starting fresh in the cloud, we can bring deep technical knowledge and a proven framework to deliver a seamless data warehouse migration experience.

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