Data · Modernisation

Legacy database migration

We move data out of old or unsupported databases into modern, supported platforms. Everything is mapped, cleaned, validated and reconciled, so nothing is lost and the numbers still match.

Book a free consultationHow it works ↓

What's included

What our legacy database migration service covers

  • 01

    Data audit

    A review of tables, relationships, data quality and hidden business rules in stored procedures and triggers.

  • 02

    Schema design

    A modern target schema that keeps what works and fixes long-standing structural problems.

  • 03

    Migration scripts

    Repeatable, tested scripts that can be re-run until the data is right, not one-off manual exports.

  • 04

    Data cleaning

    Duplicates, broken references and inconsistent formats fixed or flagged for your review.

  • 05

    Validation & reconciliation

    Row counts, totals and spot checks compared between old and new systems before sign-off.

  • 06

    Parallel run

    Both systems run side by side for an agreed period, so you can switch with confidence.

When to bring us in

Signs it's time

  • 01Your database runs on software that's no longer supported
  • 02Only one person knows how the data is structured
  • 03Reports are slow or require manual exports to Excel
  • 04You can't connect the database to newer tools
  • 05You're replacing an old application but need to keep its history

Process

How it works

  1. 01

    Analyse

    Structure, data quality and business rules.

  2. 02

    Map

    Old to new, field by field.

  3. 03

    Migrate

    Tested scripts, run in stages.

  4. 04

    Verify

    Reconciliation and parallel run.

Technologies we work with

  • Microsoft SQL Server
  • PostgreSQL
  • MySQL
  • Oracle
  • MS Access
  • FoxPro / dBase
  • Python
  • SSIS

FAQ

Frequently asked questions

Which old databases can you migrate from?

Common sources include MS Access, FoxPro, dBase, Paradox, old versions of SQL Server and Oracle, and flat files. If you're unsure what you have, we'll find out in the audit.

How do we know no data was lost?

Every migration ends with a reconciliation report: record counts, financial totals and sample checks compared between the old and new systems.

Can the old application keep running during migration?

Yes. We usually sync data incrementally and do the final switch in a short, planned window.

What if the data is in bad shape?

That's normal for legacy systems. We clean what can be fixed automatically and give you a list of records that need a business decision.

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Until 31 December 2026

Talk to an engineer about legacy database migration

Your first two consultations are free. Tell us where you are now and where you want to be, and we'll give you an honest view of the options.

Book a free consultationhello@deverlin.com