---
schema_version: "1"
id: 6f3ebfb7252ea98c39bcb3f2fd1d9ac242bf3906b7b8c52fa2c43833c60580b1
title: High Data Volume Considerations for Salesforce Connect—Custom Adapters
collection: admin
version: current
locale: en-us
portal_url: https://docs.salesforce.com/admin/current/en-us/platform/264-0-0/apex_considerations_high_data_volume.md
canonical_url: https://help.salesforce.com/s/articleView?id=platform.apex_considerations_high_data_volume.htm&release=264.0.0&type=5
source_site: help.salesforce.com
content_type: documentation
content_hash: 88a93299de1fe4f9ba6d83e7f31a3bdf209b1f64851da2c4da7766503c179c3d
description: If your org hits rate limits when accessing external objects, consider selecting the High Data Volume option on the associated external data sources. Doing so bypasses most rate limits, but some special behaviors and limitations apply.
products:
  - Salesforce Platform
  - Security
release: "264"
---
# High Data Volume Considerations for Salesforce Connect—Custom Adapters

If your org hits rate limits when accessing external objects, consider selecting the **High Data Volume** option on the associated external data sources. Doing so bypasses most rate limits, but some special behaviors and limitations apply.

### Required Editions

<table class="slds-table slds-table_bordered slds-max-medium-table_stacked slds-m-bottom_small edition">
      <colgroup>
        <col>
      </colgroup>
      <tbody>
        <tr class="">
          <td class="slds-cell-wrap" style="vertical-align:top;">Available in: both Salesforce Classic and Lightning Experience (not for high-data-volume
            external objects)</td>

        </tr>
        <tr class="">
          <td class="slds-cell-wrap" style="vertical-align:top;">
            <p>Available in: <strong>Developer</strong> Edition</p>
            <p style="margin-bottom:0;">Available for an extra cost
              in: <strong>Enterprise</strong>, <strong>Performance</strong>, and <strong>Unlimited</strong>
              Editions</p>
          </td>

        </tr>
      </tbody>
    </table>

- The following features aren’t available for external objects that are associated with high-data-volume external data sources.
    
    - Access via Lightning Experience
    - Access via the Salesforce mobile app
    - Appearance in Recent Items lists
    - Record feeds
    - Reports and dashboards
    - Writable external objects
- Salesforce IDs aren’t assigned to external object records that are associated with high-data-volume external data sources.
- On record detail pages for external objects that are associated with high-data-volume external data sources, custom buttons, and links that call JavaScript aren’t supported.
- Salesforce Console in Salesforce Classic doesn’t support external objects that are associated with high-data-volume external data sources.
- CSRF protection for writable external objects isn’t available for high-data-volume external data sources.

#### See Also

- [Custom Adapter for Salesforce Connect](https://help.salesforce.com/s/articleView?id=platform.apex_adapter_about.htm&release=264.0.0&type=5 "Connect to any data anywhere for a complete view of your business. Use the Apex Connector Framework to develop a custom adapter for Salesforce Connect.")
- [Considerations for Salesforce Connect—Custom Adapter](https://help.salesforce.com/s/articleView?id=platform.apex_adapter_considerations.htm&release=264.0.0&type=5 "Understand the special behaviors, limits, and recommendations for using a Salesforce Connect custom adapter built with the Apex Connector Framework.")