Search notes:

Oracle hint: MONITOR

The monitor and no_monitor hints specify if SQL statement that take less (or more) than 5 seconds are monitored
select /*+ monitor */
   dummy
from
   dual;

select * from table(dbms_xplan.display_cursor(format => 'rowstats -rows last'));
--
-- ----------------------------------------------------
-- | Id  | Operation         | Name | Starts | A-Rows |
-- ----------------------------------------------------
-- |   0 | SELECT STATEMENT  |      |      1 |      1 |
-- |   1 |  TABLE ACCESS FULL| DUAL |      1 |      1 |
-- ----------------------------------------------------

See also

v$sql_monitor and v$sql_plan_monitor
Other hints

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