Order by before rownum

I am trying to select top 200 records from a really complex select query with order by. But Oracle does top 200 first then order by if I put rownum and order by in one select query, which will give me top 200 records redomly every time. I know a way to work around is doing following
select * from (select................ order by ......) where rownum<=200
but this will really take long time since the inner select query is big one. it joins 15 some tables to get all informations. I know in MS SQL, you can have select top(200)...... ordery by ...., it will do order by then top 200. This is making query running really fast.
Is there other ways to make this run faster in Oracle. Possiblely puting oder by and rownum<200 in one select query?
Thanks!
Edited by: user4916474 on Jan 14, 2011 8:24 AM

Hi,
See these threads for the information you need to post when you have a performace issue:
When your query takes too long ...
HOW TO: Post a SQL statement tuning request - template posting
If you have a complicated query involving 15 tables, the solution is likely to be complicated, too. For example, you might need to find the top 200 rows before joining all the tables, so just looking for an alternative to ROWNUM probably won't help all by itself, though it may be part of the overall solution.
One alternative to ROWNUM is the analytic ROW_NUMBER function:
SELECT  *
FROM     (
         SELECT  ...
         ,         ROW_NUMBER () OVER (ORDER BY ...)     AS r_num
         FROM    ...
WHERE     r_num     <= 200
;It might not be faster than ROWNUM, but it's probably not slower, either, and it can be adapted to other requirements (e.g., the top 200 for each department).

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