Since you haven't really done anything with it you shouldn't have to go into sql.
First thing is to delete the Vault Store.
http://seer.entsupport.symantec.com/docs/279892.htm
Deleting a Vault Store in Enterprise Vault (EV)
Details:
It is possible to delete a vault store, provided that the Vault Administration Console (VAC) shows a status of Available or Closed.
Note: Once a vault store deletion is started, there is no undo and the deletion process cannot be stopped.
To delete a vault store:
1. In the VAC, with the vault store displayed in the listing, press F5 to refresh the view. This shows the vault store's current status.
2. Right-click the vault store that needs to be deleted and, on the shortcut menu, click Delete.
3. There is a confirmation prompt.
4. Click Delete.
The vault store's status changes to Marked for deletion. After the status changes, it is no longer possible to view the properties of the vault store and shortcuts to items within its archives will not work. When EV has completed the deletion, the vault store will be removed from the list. This operation may take some time.
You may need to refresh the Admin console to see it gone.
Next remove the EV server. It might prompt you to delete the Index locations and Index Service first.
After you remove it from the Admin Console everything will removed from SQL but you will need to delete the Vault Store Database from SQL manually.
Let me know if you run into any issues.
