Spooling issue

Question

I have a sql to spool records.But when I execute this the spool file test.log is having a size of 1k even though
It doesnt contain any records .I want the size of log to be 0 k if no records in it.Any set option can I use to overcome this??
set pagesize 0;
set linesize 100;
set colsep '';
set feedback off;
set term off;
spool tes.log;
select distinct aa.user_id, letter_doc_name from temp_mc_letters aa,
(select distinct user_id, decode(user_id2, null,'not found','99', 'not found','found') found_status
from temp_mc_letters ) a,
(select user_id from
  (select distinct user_id, decode(user_id2, null,'not found','99', 'not found','found') found_status
from temp_mc_letters)
group by user_id
having count(9)=1
)                       b
where aa.user_id=a.user_id
  and aa.user_id=b.user_id
  and a.found_status='not found';
spool off;-Hena

Answer 1

It will work if you run it inside a script:
C:\TEMP>dir
Volume in drive C has no label.
Volume Serial Number is 2450-CE06
Directory of C:\TEMP
05/04/2010  03:43 PM    <DIR>          .
05/04/2010  03:43 PM    <DIR>          ..
05/04/2010  03:42 PM               187 test.sql
               1 File(s)            187 bytes
               2 Dir(s)  103,568,400,384 bytes free
C:\TEMP>type test.sql
set pagesize 0;
set linesize 100;
set colsep '';
set feedback off;
set term off;
spool test.log;
select * from scott.emp e, scott.dept d where e.deptno = d.deptno;
spool off
C:\TEMP>
C:\TEMP>
C:\TEMP>
C:\TEMP>sqlplus scott/tiger
SQL*Plus: Release 10.2.0.4.0 - Production on Tue May 4 15:44:24 2010
Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
scott@PTS>@test.sql
scott@PTS>host dir test.log
Volume in drive C has no label.
Volume Serial Number is 2450-CE06
Directory of C:\TEMP
05/04/2010  03:44 PM             1,762 test.log   <--  actually contains data
               1 File(s)          1,762 bytes
               0 Dir(s)  103,568,330,752 bytes free
scott@PTS>host vi test.sql
scott@PTS>host type test.sql
set pagesize 0;
set linesize 100;
set colsep '';
set feedback off;
set term off;
spool test.log;
select * from scott.emp e, scott.dept d where e.deptno = d.deptno and 1=2; -- so it doesn't return data
spool off
scott@PTS>@test.sql
scott@PTS>host dir test.log
Volume in drive C has no label.
Volume Serial Number is 2450-CE06
Directory of C:\TEMP
05/04/2010  03:48 PM                 0 test.log
               1 File(s)              0 bytes
               0 Dir(s)  103,568,089,088 bytes free