SQL report in 9.2.1 is very slow compared to 7.3

Hi,
I have an sql report which takes only 5 minutes (oracle version 7.3) is taking almost double the time(one or two user accessing the system) with oracle version 9.2.1.
This report sums the total amount grouped by date field using two tables. Data is exported from 7.3 and imported to 9.2. Indexes are same and the explain plan gives the same resultand runs on unix tru64. Other PL sql and proc programs performance is good compared to version 7.3
Any idea why the statement is slow.
Thanks
sreekumar

It seems using F9 is the same as Ctrl+Enter, it just repeats the execution. I tried running "select count(*) from <table>" using a basic connection against a remote 11.2 DB, where the <table> had anywhere from 20K to 60K rows, on both 2.1.0.63 and 3.0.02.31. Regardless of the version, or table size, or repeated execution, all executions ran from 0.062 to 1.4 seconds. Sometimes successive executions run faster, sometimes not. Depends on what the database server and the network are doing.
The <table> cases all happened to have indexes, so Autotrace showed the DB doing an index fast full scan. Even with dropping the index on the 60K table and forcing a table full access, the count(*) came back in under 0.25 sec, so the table needs to be bigger for lack of index to make a difference.
Possibly the database version could be a factor, I haven't tested on 9i or 10g, but then that wouldn't really make much sense for simple counting. You are no doubt aware of the impact that file system or DB buffer caching could have on this type of test. Here is a post from Ask Tom on the same:
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:311990400346061304

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