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
Conversions That Generate a Change Event
Conversions That Generate a Gap Event
Conversions That Don’t Generate Events
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Conversions That Don’t Generate Events

No change or gap events are generated for custom field type conversions that preserve or truncate field data, and for conversions between Picklist and Text fields.

Compatible Field Types with No Data Change

When converting a field type to another type that is compatible, field data is unchanged, and no event is generated. For example, these conversions are compatible.

  • Changing a Text Area, Email, Url, Phone, Autonumber, Number, Percent, or Currency field to a Text field
  • Changing a Text field to a Text Area, Text Area (Long), Email, Url, Phone, or Autonumber field

Other Field Type Conversions

These field type conversions also don't generate events.
  • Changing a Picklist field to a Text field
  • Changing a Text field to a Picklist field
  • Conversions that result in truncated data because the target field type has a smaller size, such as changing a Text Area (Long) field to a Text, Text Area, Email, Url, or Phone field