SQL> col name format a30
SQL> col value format 999,999,999,999,999
SQL>
SQL> -- 1. 1st snapshot
SQL> col value new_value prev_value
SQL> select name, value
  2    from v$sysstat
  3   where name = 'session logical reads';

NAME                                          VALUE
------------------------------ --------------------
session logical reads                       443,353

SQL>
SQL> -- 1-1. save 1st snapshot
SQL> prompt &prev_value
443353
SQL>
SQL> -- 2. Workload Process
SQL> select count(*) from all_objects ;

  COUNT(*)
----------
     45980

SQL>
SQL>
SQL> -- 3. 2nd snapshot
SQL> col value new_value next_value
SQL> select name, value
  2    from v$sysstat
  3   where name = 'session logical reads';

NAME                                          VALUE
------------------------------ --------------------
session logical reads                       516,860

SQL>
SQL> --  3-1. save 2nd snapshot
SQL> prompt &next_value
516860
SQL>
SQL> -- 4. Diff Report
SQL> select (&next_value - &prev_value) as diff from dual ;
구   1: select (&next_value - &prev_value) as diff from dual
신   1: select (    516860 -     443353) as diff from dual

      DIFF
----------
     73507