Understand and use the Person ID dimension to resolve people count mismatches

Last update: Mon Mar 02 2026 00:00:00 GMT+0000 (Coordinated Universal Time)

When a CJA connection uses multiple datasets with different identity fields, people counts can look wrong or hard to explain. Use the Person ID (adobe_personid) dimension to identify which IDs CJA uses as the person identifier across datasets and to validate people counts.

Description description

Environment

Adobe Experience Platform (AEP)
Customer Journey Analytics (CJA)
CJA connection with:
- One or more event datasets
- Optional profile datasets
Connection configured with one or more fields as Person ID

Issue/Symptoms

People counts differ from expectations or from other tools (for example, Query Service).
Multiple datasets in the same connection use different identity fields.
Users cannot see clearly which identifier CJA uses as the unified person key.

Resolution resolution

What Person ID does

Unifies identities across datasets The Person ID (adobe_personid) dimension combines all fields marked as Person ID in the connection into a single dimension.
Drives the People metric The People metric in CJA counts unique Person IDs, not individual identity fields per dataset.

How to enable Person ID in a data view

Open the relevant data view in Customer Journey Analytics.
In the left panel, open Components.
In the dropdown, select Metrics and Dimensions.
Expand Adobe Metrics and Dimensions.
Add Person ID (adobe_personid) to the included dimensions.
Save and publish the data view.

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