Select based on rownum

Experts I need your input.
We have a select sql query to spool data into a flat file. There can be scenario where we need to split that spooled file into multiple data files due to size limits in staging location and transfer data limits. Given this scenario which one would be the better solution.
Solution 1. Basic select statement to select necessary data upon which there will be wrapper query which will restrict the data based on rownum
Ex:-
Basic select query
select * from table_a
Spoole file 1 will have
Select table_a_id
From (select * from table_a)
Where rownum >0 and rownum<101
Spool file 2 will have
Select table_a_id
From (select * from table_a)
Where rownum >100 and rownum<201
And so on..
Solution 2. One select statement which spools all the selected data into a spool file.
Ex:
spool test.spl
Select * from table_a_id
From table_a
Then split the file into multiple files using unix split command.
I think in step 1 all though it seems like multiple parallel queries can be run to extract data but, the inline view, which is our basic select statement selects the complete data from the table then it restricts data output based on rownum. So each select query execution time will be equal to or more time than its inline sql query execution time.
Say if our basic select statement takes 30 mnts to query then the select statement in each spool files takes 30 or more than 30 mnts to query.
Am I right in my assumtion?
Pls advise
S

First off, the proposed queries to populate the 2 spool files are incorrect. The second statement will never return any rows and you have no order by clause, so you're selecting an arbitrary 100 rows in the first query. If you want to do something like this, you'd need something like (stolen from asktom.oracle.com at http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:127412348064)
select *
from ( select a.*, rownum rnum
from ( YOUR_QUERY_GOES_HERE -- including the order by ) a
where rownum <= MAX_ROWS )
where rnum >= MIN_ROWSSecond, assuming you're using Tom's syntax, Oracle will be smart enough not to have to materialize every row from the table in order to return the range you want. That being said, the larger MAX_ROWS value, the more rows have to be materialized and the slower the query gets. The presence of an ORDER BY may force Oracle to do some additional work depending on the access path. You also have to start worrying about contention for resources among parallel queries.
I'd tend to prefer the Unix split command all things being equal.
Justin

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