How to Set Business Keys for CDC Pipelines

April 2026

Business keys decide whether CDC lands as a clean final-state table or a mess of duplicate rows.

Short Answer

Set business keys on the columns that define row identity in the destination. If the key is wrong, your CDC pipeline can still run, but the final-state table will be hard to trust.

Skippr uses business keys to reconcile change events into warehouse rows. That makes them one of the few CDC settings worth slowing down for.

Why Teams Struggle with This

Teams often treat business keys like a minor config detail. They are not. They decide whether updates land as clean merges or whether the destination fills with duplicates and bad state.

• A natural key exists in the source but never gets declared.
• Teams use a non-unique column because it "looks stable."
• CDC events arrive fine, but the destination table does not reflect final state.
• Downstream models end up cleaning up merge mistakes that should have been fixed at ingestion time.

How Skippr Handles It

Skippr keeps the setting explicit. You define business keys in the CDC config, then the destination-aware merge path uses them when reconciling changes.

That keeps the hard part where it belongs: in the data contract, not hidden in downstream SQL patch jobs.

• Business keys live in the pipeline config.
• Destination merges use that identity explicitly.
• Exactly-once final-state behavior stays tied to declared row identity.
• The generated dbt project starts from cleaner warehouse tables.

What the First Useful Version Looks Like

A good business key choice saves a lot of cleanup later.

A bad one leaks into every downstream model.