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Change Data Capture Developer Guide

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Change Data Capture

Keep Your External Data Current with Change Data Capture

Change Event Message Structure

Merged Change Events

Other Types of Change Events: Gap and Overflow Events

Subscribe to Change Events

Monitor Change Event Publishing and Delivery Usage

Security Considerations

Change Event Considerations

Standard Object Notes

Change Events for Fields

Sending Data Differences for Fields of Updated Records

Change Events for Custom Field Type Conversions

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Change Data Capture

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Change Events for Fields

Change Events for Fields

Learn about the change event characteristics for fields.

Sending Data Differences for Fields of Updated Records
To reduce the event payload size and improve performance, Salesforce sometimes sends data differences of updated text values. For large text fields, such as Description or Long Text Area fields that contain at least 1,000 characters, only the data differences might be sent. Data differences use the unified diff format.
Change Events for Custom Field Type Conversions
When you change the type of a custom field, a change event or gap event is generated for data changes for some conversions. Other conversions, such as those that preserve or truncate field values, don't generate events.