How do i know if my query using SORT_AREA_SIZE or temporary tablespace ?

Good Morning Everyone !
My DB version is 10.2.0.1
I have large table exactly 3 million records.
SQL> select count(*) from tab1;
COUNT(*)
   300000
SQL> select * from tab1 order by no DESC;
sorting ... in process
300000 rows selected.
in Terminal 2 : I tried to find sorting details -   ( No rows selected - why ? )
SQL> select USERNAME , USER , TABLESPACE , SQL_ID from v$tempseg_usage ;
no rows selected
SQL> /
no rows selected
When i google i have seen this ;
If Oracle cannot do the sort in memory (SORT_AREA_SIZE initialisation parameter), space will be allocated in a temporary tablespace for doing the sort operation.
REF_LINK : TEMPORARY Tablespaces and TEMPFILES | Oracle FAQ
MY DOUBT QUESTION :   How do i know if my query using SORT_AREA_SIZE or temporary tablespace ?
Thanks in advance.

@ JohnWatson
I have seen some articles from ORA - FAQ. Good.
SQL> select USERNAME , USER , TABLESPACE , SQL_ID from v$tempseg_usage;
USERNAME                       USER   TABLESPACE                      SQL_ID
   SCOTT                               SYS          TEMP                            fh9vqgyd6m0d1
PGA management means that sorting only 300000 rows may well occur in memory
            Is this (3 million rows) - standard value for 10g version ?
Thanks JohnWatson

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