---
title: Remove CMDB tables or classes from impact calculation
description: Exclude unnecessary CMDB tables or classes from impact calculation to improve performance and focus on relevant data.
locale: en-US
canonical_url: https://www.servicenow.com/docs/r/australia/it-operations-management/event-management/remove-cmdb-tables-impact-cal.html
release: australia
product: Event Management
classification: event-management
topic_type: task
last_updated: "2026-10-09"
reading_time_minutes: 1
breadcrumb: [Alert impact calculation, Manage and monitor alerts, Configure, Event Management, ITOM AIOps, IT Operations Management]
---

# Remove CMDB tables or classes from impact calculation

Exclude unnecessary CMDB tables or classes from impact calculation to improve performance and focus on relevant data.

## Before you begin

Role required: evt\_mgmt\_admin, evt\_mgmt\_operator, or evt\_mgmt\_user

## Procedure

1.  Navigate to **All** and search for `em_impact_inclusion_class.list`.

    The Impact Inclusion Classes page opens, displaying a list of CMDB classes that are included in impact calculation.

    \[Omitted image "em-impact-cal-cmdb-tables-list.png"\] Alt text: A list of CMDB classes that are included in impact calculation.

2.  Select the CMDB table that you want to remove.

3.  Select the Actions on selected rows menu and then select **Delete**.

4.  In the confirmation window, select **Delete**.

    The CMDB table is removed from the list.