Data tools
Eloqua's Deduplication and Validation Rules are powerful tools for helping ensure the quality and accuracy of your Eloqua data. Deduplication rules and handlers make it easy to remove duplicate records in an automated way; validation rules ensure that data uploaded into Eloqua or submitted in a form meets your format requirements.
You can access Eloqua's Data Tools under the Audience 
menu in the Eloqua toolbar. Only users with sufficient permissions to configure data tools will be able to view the Data Tools option.