SQL> show parameter sessions

NAME TYPE VALUE
------------------------------------ ------- ------------------------------
java_max_sessionspace_size integer 0
java_soft_sessionspace_limit integer 0
license_max_sessions integer 0
license_sessions_warning integer 0
mts_sessions integer 0
sessions integer 390
SQL> show parameter processes

NAME TYPE VALUE
------------------------------------ ------- ------------------------------
aq_tm_processes integer 0
db_writer_processes integer 1
job_queue_processes integer 0
log_archive_max_processes integer 1
processes integer 350

SQL> select a.qty as se_qty,b.qty as pr_qty
  2 from
  3 (select count(*) as qty from v$session) a,
  4 (select count(*) as qty from v$process) b
  5 ;

    SE_QTY PR_QTY
---------- ----------
       296 297