Server Side Pagination sql server and datatables

Hi, I have the datatables Successfully Implemented with my Coldfusion code. But there is a Problem, I am unable to use the sql server fetch offset with it,

right now my query returns around 5000000 records without using offset which is usually taking a lot off time , i am trying to show 10 at a time so query should not time out and it should on click of next page start with the offset and show 10 rows only

This is my code

Jquery Code

    $(document).ready(function() {
        $('#ButtonSubmit').on('click', function (e) {
            e.preventDefault();
            $.ajax({
                url: "getheaders.cfm",
                cache: false,
                data : $('#form').serialize(),
                method: "post",
                success: function(response){
                    $('.mytable').html(response);
                }
            }).done(function(data) {
                $('.table').show();
                $(".table").DataTable({
                    "bFilter": true,
                    "serverSide": true,
                    "columns": [
                        { "data": "name", "title": "Name", "autoWidth": true },
                        { "data": "fname", "title":"First Name", "autoWidth": true }
                    ],
                    "ajax": {
                        "url" : "datatables.cfm",
                        "type" : 'post'
                    },
                    "language": {
                        "processing": "Loading..."
                    }
                });
            })
        });
    });

now the coldfusion code

<cffunction name="records" access="remote" returnformat="json" returntype="any" output="false">

        <cfparam name="draw" default="1" type="integer" />
        <cfparam name="start" default="0" type="integer" />
        <cfparam name="length" default="10" type="integer" />
        <cfparam name="search" default="" type="string" />

        <cfset var aData = arrayNew(1) />
        <cfset var sGridData = StructNew() />
        <cfif len(form["search[value]"]) gt 0>
            <cfset search=form["search[value]"]>
        </cfif>

        <cfset var rsQuery = ''>

        <cfset var listColumns = 'name,firstname'>
        <cfquery name="rsQueryData" datasource="#Application.dsLocal#">

            ;WITH cte AS(
                SELECT ROW_NUMBER() OVER (PARTITION BY id ORDER BY DateCreated DESC) AS rn,
                    name,firstname
                FROM table1 
                WHERE 1=1

                    <cfif len(trim(search))>
                    AND
                        ( 
                        <cfloop list="#listColumns#" index="thisColumn">
                        <cfif thisColumn neq listFirst(listColumns)> 
                        OR 
                        </cfif>
                        #thisColumn# LIKE <cfqueryparam cfsqltype="CF_SQL_VARCHAR" value="%#trim(search)#%" />    
                        </cfloop>
                        )
                    </cfif>
                    order by 2 desc 
                    OFFSET val(start+1) ROWS FETCH NEXT #length# ROWS ONLY;

            UNION
                SELECT ROW_NUMBER() OVER(PARTITION BY id ORDER BY datecreated desc ) AS rn,
                    name,firstname
                FROM table2 
                WHERE 1=1

                    <cfif len(trim(search))>
                    AND
                        ( 
                        <cfloop list="#listColumns#" index="thisColumn">
                        <cfif thisColumn neq listFirst(listColumns)> 
                        OR 
                        </cfif>
                        #thisColumn# LIKE <cfqueryparam cfsqltype="CF_SQL_VARCHAR" value="%#trim(search)#%" />    
                        </cfloop>
                        )
                    </cfif>
                    order by 2 desc 
                    OFFSET val(start+1) ROWS FETCH NEXT #length# ROWS ONLY;


            )
            SELECT *  
            FROM cte WHERE rn = 1 
        </cfquery>

        <!--- Loop our results, implementing our filtering and pagination and putting into an array to be returned --->
        <cfoutput query="rsQueryData" startrow="#val(start+1)#" maxrows="#val(length)#">
            <cfset sGridData = structNew() />
                <cfset sGridData['name'] = rsQueryData['name'][currentRow] />
                <cfset sGridData['firstname'] = rsQueryData['FirstName'][currentRow]/>

            <cfset ArrayAppend(aData, sGridData) />
        </cfoutput>

        <cfset sGridReturn["draw"] = val(draw) />
        <cfset sGridReturn["recordsTotal"] = 10000 />
        <cfset sGridReturn["recordsFiltered"] = rsQueryData.RecordCount />
        <cfset sGridReturn["data"] = aData />
        <cfreturn sGridReturn />
    </cffunction>

as i am using the order by clause and the offset it gives me just 17 records while i have so many records, what i am missing here

i want the query should give calculate all the records and give me the results paginated way like 10 at a time so my query should not timeout and smoothe it should go

because after this next task is to get full data in excel