PeoplePicker search returns results from both directories

Document ID : KB000076497
Last Modified Date : 06/04/2018
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Issue:
We have SharePoint 2016 integrated with db2 and AD. When we search a user we are receiving results from both the directories where as the requirement is to return results from just the one where the user is logged into.
Resolution:
People Picker will show results from AD for every TIP regardless of configuration, so AD results will be included in every search.  There is no way to avoid this.