Change Data Capture Developer Guide

Change Data Capture
Keep Your External Data Current with Change Data Capture
Change Event Message Structure
Subscribe to Change Events
Subscription Channels
Subscribe with the EMP Connector Sample
Subscribe with Apex Triggers
Change Event Triggers
Apex Trigger Quick Start
Apex Trigger Example
Test Change Event Triggers
Change Event Trigger Considerations
High-Level Replication Steps
Security Considerations
Change Event Considerations
Standard Object Notes
Change Events for Fields
Other Types of Change Events: Gap and Overflow Events
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Change Event Trigger Considerations

Keep these considerations in mind when working with change events in Apex triggers.
Triggers for Non-Enabled Objects
You can save an Apex trigger for a change event object even if the object isn’t selected for notifications on the Change Data Capture page. When the object isn’t selected, the trigger doesn't fire. To ensure that the trigger fires, select the object for notifications. Any type of change event fires a change event trigger, including gap events and overflow events.
No Formula Field Support
Formula fields aren't supported in Change Data Capture. They are null in a change event trigger, regardless of whether they were changed.
Null Name Field for Person Accounts
For a person account, the Name compound field in the AccountChangeEvent received in the trigger is null. The FirstName and LastName fields, which are included in the Name field, contain the person account first name and last name values. In contrast, the ContactChangeEvent Name field contains the concatenated values of the salutation, first name, and last name.