You can delete a database. When you delete a database, all items associated with the database - known as assets - are also deleted. It is not possible to restore a database or its assets after the database has been permanently deleted.
Procedure
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In Data, select the database that needs to be deleted.
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Click Delete and click OK in the confirmation dialog.
The following message displays: You are about to submit a delete contact source data
job that will run in the background.
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Review the job details and choose whether you want to receive email notification once the job
is complete.
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Click Submit to submit the data job. A data job runs in the
background.