The SQL below shows how many sorts have been done in memory and how many have had to go out to disk since instance startup:
SQL> col name format a20
SQL> l
1 select name, value
2 from v$sysstat
3* where name in ('sorts (memory)', 'sorts (disk)')
SQL> /
NAME VALUE
-------------------- ----------
sorts (memory) 1758574
sorts (disk) 0
SQL>
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