Query taking way too long

Hello,
Can somebody please help.
I am wanting to change this query so that it does not take too long. How can I do it please?
select count(*), t.tel_no, t.prospect_id, a.ACCOUNT_NO, a.account_title
from tel_nos t, account a
where t.tel_type = 'S'
AND t.prospect_id = a.prospect_id
AND SYSDATE BETWEEN t.start_date AND NVL(t.end_date, SYSDATE)
group by t.tel_no, t.prospect_id, a.ACCOUNT_NO, a.account_title
having count(*) > 1
Thanks in advance.

Tuning is a science not a parlour guessing game. It's hard for us to diagnose the problem you have here as you have given us almost no information. For instance, are you using rule based or cost based optimizer? How big are these two tables? What indexes do they have? What percentage of rows are you expecting the query to return?
Tuning is such a big area that it's hard to know where to begin. I suggest you start at the Oracle docs. Chapters 1, 4 and 5 will set you going.
http://download-west.oracle.com/docs/cd/A87860_01/doc/server.817/a76992/toc.htm
Having said all that you may well find this runs faster:
SELECT count(*), t.tel_no, t.prospect_id, a.account_no, a.account_title
FROM   account a, tel_nos t
WHERE t.tel_type = 'S'
AND    sysdate BETWEEN t.start_date AND nvl(t.end_date, sysdate)
AND    t.prospect_id = a.prospect_id
GROUP BY t.tel_no, t.prospect_id, a.account_no, a.account_title
HAVING count(*) > 1
/I leave it to you to work out why (it's nothing to do with clearer layout).
Cheers, APC

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