First Method (recommended):
Install the Analytics Database Manager version 3.0
- When Analytics Database Manager is installed, access the application from the Sitecore launchpad.
- Go on the "REMOVE OLD DATA" tab, select the desired options and click start.
Second Method:
- Delete your MongoDB Databases related to the Sitecore instance.
- Replace the Reporting Database with a clean copy of the corresponding Sitecore version or use the __DeleteAllReportingData stored procedure in /Programmability/Stored Procedures .
- Restart your Sitecore Instance.