I cant make this query more efficient

Question

Im trying to create a script that shows the most viewed documents, but it's creating many temporary tables on disk.... Here's the query, I don't see where the error is or where the query turns abusive.

select 
notas.notid,
notas.ttl,
notas.brv,
notas.fch,
nots.notid,
nots.cnt,
nots.fch,
nots.sccn,
SUM(nots.hit) AS lasuma
FROM cadenano_cbc_noticias.notas
INNER JOIN cadenano_cbc_relacbc.nots
ON notas.notid = nots.notid
WHERE nots.cnt = 'notas'
AND nots.fch BETWEEN CURDATE() - INTERVAL 3 DAY AND CURDATE()
GROUP BY nots.notid
ORDER BY lasuma DESC
LIMIT 10

Can some one point me in the right direction?

Answer 1

You can speed up a query if you look at the part of the query that uses the data for calculations: where clauses and order clauses mostly.

If you don't have already then add indexes on nots.cnt and nots.fch .

It is also a good practice to run a explain :

explain select notas.notid, ...

The output will tell you if keys are used and where not.