MS-SQLSERVER - SQL Query using ROW_NUMBER taking long time with 0 result from query

Question

select autoid from (SELECT ROW_NUMBER() OVER (ORDER 
BY MYTABLE.DETECTEDUTC DESC) as rownum, autoId from 
MYTABLE where MYTABLE.guid in (..guids..)) as tab1 where rownum >=1000 and rownum < 1020 

We are having a table MYTABLE which may contain millions of records currently it is having 10 million records. above SQL query used to get paginated data in our code, it works fine till query giving results, but hangs for hours if query returning 0 results. Also SQL server start consuming system RAM while running above query and which is not returning any record.

on the other hand following query works fine with 0 results -

select autoid from (SELECT ROW_NUMBER() OVER (ORDER 
BY MYTABLE.DETECTEDUTC DESC) as rownum, autoId from 
MYTABLE where MYTABLE.guid in( ..guids..)) as tab1

Answer 1

Regardless of the issue in the query I am presenting the way I usually achieve paging:

As input (for a stored procedure for instance):

@fromIndex int = 0 -- default starting from index 0
@count int = 10 -- default returning 10 items per page

Generic SQL logic:

CREATE TABLE #PaginatedItems (
    Column1 int, -- declare your needed columns here
    Column2 varchar(50),
    rowIndex int -- needed for pagination logic
);

WITH OrderedItems AS
    (
        SELECT
            SourceTable.Col1, -- will end up in #PaginatedItems.Column1
            SourceTable.Col2,
            ROWNUMBER() OVER (
                                 ORDER BY <sort criteria>
                             ) AS rowIndex
        FROM
            SourceTable
    )
INSERT INTO
    #PaginatedItems
SELECT
    *
FROM
    OrderedItems
WHERE
    rowIndex >= @fromIndex + 1 AND rowIndex <= @fromIndex + @count

SELECT * FROM #PaginatedItems -- the query that returns the items

Hope this helps.