Only review database administrators can perform document deletions.
Specific document deletion might be necessary due to a court order or a legal agreement, such as in a clawback. No matter the reason, document deletion is performed like any other mass action, with documents selected via a search or by using the checkboxes in the document list.
Document deletion can be performed on as many documents as you select through search. If you want to delete an entire ingest, you can also delete documents through deleting an ingest session.
Once you've clicked Delete documents, you will see a warning screen which will include information about the particular collection of documents you selected. Colored boxes at the top of the screen alert you to the fact that some of the selected documents have a complication or concern you should be aware of. This screen also includes a link to download a pre-deletion report, which includes details about the documents you want to delete.
You should read all of the warnings carefully, since you may wish to make changes to which documents are being deleted, or export a list of the documents before deletion.
After you have deleted your documents, you may need to refresh the window for the documents to disappear from your database's list.
For deleting the complete database refer to Delete a Matter, Review Database, Case Database