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
Change Event Storage and Delivery
Subscription Channels
Compose Streams of Change Data Capture Notifications with Custom Channels
Example Diagrams for Channels and Channel Members
Transaction-Based Replication Steps
Subscribe with Pub/Sub API
Get Compound Fields in Change Events
Enrich Change Events with Extra Fields
Filter Your Event Streams
Change Event Filters
Filter Expressions in Channel Members
Add a Filter with Tooling API
Add a Filter with Metadata API
Subscribe to the Channel and Receive the Filtered Event Stream
Get Custom Channels and Channel Members
Subscribe with Apex Triggers
Monitor Change Event Publishing and Delivery Usage
Security Considerations
Change Event Considerations
Standard Object Notes
Change Events for Fields
PDF

Filter Expressions in Channel Members

Add a filter expression in a channel member that’s associated with a custom or the standard ChangeEvents channel. We recommend that you use a custom channel so that the filtered stream is isolated from the standard event stream and subscribers expect the stream to be filtered. The channel holds the filtered stream of events that match the filter expression for the specified change event.

Let’s walk through the steps to create a channel, a channel member, and a filter expression. Then we can subscribe to the channel to validate receiving the filtered event stream.