Build an anonymous block that will trigger an error.
SQL> SQL> SET SERVEROUTPUT ON SIZE 1000000 SQL> SQL> SQL> DECLARE 2 3 4 my_string VARCHAR2(1) := ' '; 5 my_number NUMBER; 6 7 BEGIN 8 9 10 my_number := TO_NUMBER(my_string); 11 12 END; 13 / DECLARE * ERROR at line 1: ORA-06502: PL/SQL: numeric or value error: character to number conversion error ORA-06512: at line 10 SQL> SQL> SQL>