How to display only Duplicate values with a view Background

My site is very large already and its only in its infancy. The content title table has 14000+ values in it. To make sure there are no duplicate values in the table I am creating a view that will display all of the institutions with the same title and the same address. At the current time I am just checking title to keep things simple.

Problem

The sizeable amount of data means that to return values is very slow. 

Logic and Code

I am creating a view with address, type &amp; title in a table with the requirement that the only institutes that come in have the same name.

My thoughts were that on every row I would take the $row-&gt;node_title and put it into a query against every other value in title like 

$query= db_query("SELECT node.title 
                  FROM node 
                  WHERE ((node.status = '1') 
                  AND (node.type IN ('institution')) 
                  AND (node.title=".$row-&gt;node_title."))")-&gt;rowCount();


This should return a number, if the number is 1 then i want to exclude it with the following statement

if($query == 1){ 
  return true
}


Question

This is taking so long to calculate I thought there must be a faster way. I'm not even sure if the result from this is returning correctly because I've been waiting so long, Is there a faster way to get a list of all the duplicate values in a table with drupal?
Try using Remove Duplicates 


  This module helps the administrator to easily remove duplicate nodes according to one of the node fields.