Step-by-step guide to planning and executing a database migration from assessment and strategy through to post-migration optimisation.
Database migrations are complex, high-risk projects that require careful planning. This guide covers every phase from initial assessment and strategy selection, through schema and data mapping, testing and validation, cutover planning and execution, to post-migration optimisation. Includes comparison tables for migration approaches, risk matrices, and practical tips from real-world migration projects.
Database administrators, IT project managers, and technical leads planning a database migration, platform change, or cloud migration for their organisation.
Timelines vary hugely by data volume and complexity, but most UK SME migrations take between 6 and 16 weeks from initial assessment through to post-migration optimisation, with schema mapping and thorough testing usually consuming the largest share of that time rather than the actual cutover itself.
Data loss or corruption during transfer is the most serious risk, followed closely by extended downtime during cutover and application compatibility issues with the new platform. A tested rollback plan and a full data validation pass comparing source and destination records before going live are essential safeguards.
Cloud migration typically makes sense when a business needs better scalability, reduced hardware maintenance burden, or improved disaster recovery, though ongoing cloud database costs can exceed on-premises hosting for steady, predictable workloads. A proper cost comparison over three to five years usually clarifies which approach suits your usage pattern.
Yes, this guide covers a migration strategy comparison and selection framework alongside schema and data mapping guidance, testing and validation templates, and cutover and rollback procedures across five detailed planning phases.
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