Change Data Capture Developer Guide
Summer '26 (API version 67.0)
Spring '26 (API version 66.0)
Winter '26 (API version 65.0)
Summer '25 (API version 64.0)
Spring '25 (API version 63.0)
Winter '25 (API version 62.0)
Summer '24 (API version 61.0)
Spring '24 (API version 60.0)
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Summer '23 (API version 58.0)
Spring '23 (API version 57.0)
Winter '23 (API version 56.0)
Summer '22 (API version 55.0)
Spring '22 (API version 54.0)
Winter '22 (API version 53.0)
Summer '21 (API version 52.0)
Spring '21 (API version 51.0)
Winter '21 (API version 50.0)
Summer '20 (API version 49.0)
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Summer '19 (API version 46.0)
Spring '19 (API version 45.0)
Winter '19 (API version 44.0)
Merged Change Events
Monitor Change Event Publishing and Delivery Usage
General Considerations
Common Change Event Allocations
Default Change Event Allocations
Get the Number of Selected Entities
Allocations for AppExchange Released Managed Packages
Add-On License and Usage-Based Entitlement
Monitor Event Usage Against Your Allocations
Newer Version Available
Change Data Capture Allocations
Learn about the allocations for change events including the number of custom channels,
selected entities in a channel, and event delivery.
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Common Change Event Allocations
Common allocations include the concurrent CometD client allocation and the maximum event message size. -
Default Change Event Allocations
If your org has no add-on licenses, default allocations apply for event publishing and delivery that can’t be exceeded. The default allocations are enforced to ensure fair sharing of resources in the multitenant environment and to protect the service. -
Get the Number of Selected Entities
To get the number of selected entities, perform a SOQL query in Tooling API on PlatformEventChannelMember. -
Allocations for AppExchange Released Managed Packages
The allocation for selected entities doesn’t include selections that installed AppExchange released managed packages make. -
Add-On License and Usage-Based Entitlement
To increase your event delivery allocation for Pub/Sub API, CometD, empApi Lightning components, and event relays, purchase an add-on for additional change events. The add-on moves your event delivery usage to a monthly model and allows for spikes in usage. To purchase an add-on, contact your Salesforce Account Representative. -
Monitor Event Usage Against Your Allocations
Check your event publishing and delivery usage and maximum allocation in Setup, or using REST API or Apex.