ROWNUM Problem - Urgent

Question

Hi,
I have a wierd problem with using ROWNUM for pagination. I'm using the query structure as below:
SELECT * FROM ( SELECT A.*, ROWNUM rowno FROM (MY_ACTUAL_QUERY) A WHERE ROWNUM <= 200 ) WHERE rowno > 0
In some cases of the MY_ACTUAL_QUERY, there exists records, but the pagination query is not returing records. If the where clause is replaced with "ROWNUM <= 361" or "ROWNUM <= 251" in some other cases, it returns records.
Also, when some fields in the select clause are commented out, the query returns records. Is this a problem with Oracle itself or am I doing something wrong?
Regards,
Venkat

Answer 1

Hi
in the past.. i have a oracle bug whit pagination querys when i use a ROW_NUMBER ... I reported them at Oracle (bug #7033904)
Text of bug at Metalink "...If a query contains multiple analytic functions and one of them is rank, dense_rank or row_number function and if there is a topn predicate (i.e. restricting the rows to topn ranks, dense_rank or row_number) in the outer query and if the results for the other analytic functions are incorrect, you may have encountered this bug...."
This bug is already fixed on 11.2.0.1.0.
My problem was by the optimizer mode, when the optimizer mode = all_rows the query return "bad results" and when the optimizer mode = rule return "good results"
try to run the query with the optimizer = rule and let me know what happen ...
alter session set optimizer_mode=rule; One Metalink note about that.. 734502.1
Edited by: dask99 on Oct 23, 2008 1:50 PM