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When you make changes to a semantic model, or are considering making changes, it's important to be able to assess the potential impact of those changes on downstream reports and dashboards that depend on that semantic model. Semantic model impact analysis provides you with information that can help you make this assessment.
Semantic model impact analysis is easily launched from within data lineage view.
You can perform semantic model impact analysis on both shared and unshared semantic models. However, it's particularly useful for semantic models that are shared across workspaces, where it's much more complicated to get a clear picture of downstream dependencies than it is with unshared semantic models, all of whose dependencies are located in the same workspace as the semantic model itself.
In lineage view, you can tell the difference between shared semantic models and unshared semantic models by the icon that appears in the upper left-hand corner of the semantic model's card.
You can perform impact analysis on any semantic model in the workspace, whether it's shared or not. You can't perform impact analysis on external semantic models that are displayed in lineage view but are in fact located in another workspace. To perform impact analysis on an external semantic model, you need to navigate to the source workspace.
To perform semantic model impact analysis, select the impact analysis button on the semantic model card.
The impact analysis side panel opens.
The usage metrics relate to the last 30 days, excluding the current day. The count includes usage coming via related apps. The metrics help you understand semantic model use across the tenant, as well as assess the impact any changes to your semantic model might have.
If you've made a change to a semantic model or are thinking about making a change, you might want to contact the relevant users to tell them about it. When you notify contacts, an email is sent to the contact lists of all the impacted workspaces. Your name appears on the email so the contacts can find you and reply back in a new email thread.
Select Notify contacts in the impact analysis side pane. The notify contacts dialog appears.
In the text box, provide some detail about the change.
When the message is ready, select Send.
Nota
Notify contacts is not available if the semantic model you're performing impact analysis on is located in a classic workspace.
In order to perform impact analysis on a semantic model, you must have write permissions to it. In the impact analysis side pane, you only see real names for workspaces, reports, and dashboards that you have access to. Items that you don't have access to are listed as Limited access. This is because some item names may contain personal information.
Even if you don't have access to some workspaces, you still see summarized usage metrics for those workspaces, and your notify contacts messages will still reach the contact lists of those workspaces.
When you make a change to a semantic model in Power BI Desktop and then republish it to the Power BI service, a message shows you how many workspaces, reports, and dashboards are potentially impacted by the change, and asks you to confirm that you want to replace the currently published semantic model with the one you modified. The message also provides a link to the full semantic model impact analysis in the Power BI service, where you can see more information and take action to mitigate the risks of your change.
Nota
The information shown in the message only indicates potential impact. It doesn't necessarily indicate that anything has broken. Semantic model changes often have no adverse effect on their downstream reports and dashboards. Still, you get this message that gives you clarity concerning potential impact.
In the message, the number of workspaces is only shown if more than one workspace contains impacted reports and dashboards.
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