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9. For Migration Specialists – Import and optimize data from other systems

This learning path leads from data inventory through mapping, test runs and checksums to a productive start, the result of which is technically proven.

A migration is the moment in which years of lived company history change their technical home. Every partner, every item number and every open item has meaning - not just column content.

The truth is in the mapping

The real work begins before the first import: understanding sources, translating terms, defining leading systems, deciding on duplicates and defining proofs of completeness. Speed ​​comes from clarity, not from skipping checks.

From raw stock to controlled import

  1. Inventory data sources, ownership, volume, quality and legal retention.
  2. Define target objects, field mapping, keys, mandatory values, transformation and duplicate rules.
  3. Clean up and version an immutable source state.
  4. Import into an isolated test company database in technical order.
  5. Compare record counts, totals, samples, relationships and complete business channels.
  6. Plan delta, lockout time, fallback, and go-live release.

Evidence instead of gut feeling

  • Each target value has a source or documented rule.
  • Old and new IDs remain traceable via a mapping table.
  • Checksums are calculated identically before and after import.
  • Errors can be repeated without double importing.
  • Specialists responsible confirm acceptance in writing.

The typical breaking points

  • Direct production imports make learning expensive.
  • A high number of data records proves neither relationship nor technical accuracy.
  • Manual corrections after import disappear without a log.

This is what you take with you

They transform a risky data transfer into a provable, repeatable transfer of process knowledge.

In this chapter

Further information / source

Related topics

  1. For migration specialists – transferring and optimizing data from third-party systems › Basics
  2. For migration specialists – transfer and optimize data from third-party systems › Data inventory, mapping and management rules
  3. For migration specialists – transfer and optimize data from third-party systems › Cleaning, sequence and references
  4. For migration specialists – transfer and optimize data from third-party systems › Test migration, checksums and acceptance
  5. For migration specialists – transfer and optimize data from third-party systems › Cutover, fallback plan and productive start

Frequently asked questions

**What is the most important migration document?**

The mapping and decision overview: source, target, rule, key, mandatory value, owner and audit evidence.

**When is a migration finished?**

When data, relationships, totals and representative processes have been technically approved - not just when the import script ends.