How can I monitor running queries in Oracle?
Start the old application, and log in. Find your session in the database (let's say: sid=12, serial#=3456), and enable SQL tracing for that session, for example:

begin
  dbms_monitor.session_trace_enable
  (
    session_id =&gt; 12,
    serial_num =&gt; 3456,
    binds =&gt; true
  )
end;
/


There are several ways of enabling SQL tracing, it is just one of them. It may be useful to enable capturing bind values (as above), so you can match your report input parameter values to the query bind variables.

You can find the name of the trace file as:

select
  p.tracefile
from
  v$process p 
  join v$session s on (p.addr = s.paddr)
where
  s.sid = 12
;


You can start running your report from the application, and follow the contents of the trace file (even tail -f, but it will not be human-friendly). After you have finished, disable tracing:

begin
  dbms_monitor.session_trace_disable
  (
    session_id =&gt; 12,
    serial_num =&gt; 3456
  )
end;
/


You can read the raw trace file (if you are patient enough and interested in more details), but if you want only the query texts, you can use tkprof on the trace file (e.g: orcl_ora_6789.trc):

tkprof orcl_ora_6789.trc orcl_ora_6789.tk sys=no aggregate=no


With aggregate=no added, tkprof will not aggregate the SQL statements and it will generate an output where the order in which the statements were executed is preserved. Without that, you can aggregate multiple executions of the same SQL and sort them, a typical use case would be to sort by elapsed time, so you the output starts with the longest running queries:

tkprof orcl_ora_6789.trc orcl_ora_6789.tk sys=no sort=prsela,exeela,fchela