Oracle PL/SQL/PL SQL/Conditional compilation

Conditional compilation parameters are stored as name and value pairs in the PLSQL_CCFLAG database parameter

 
SQL>
SQL> BEGIN
  2    $IF $$DEBUG = 1 $THEN
  3      dbms_output.put_line("Debug Level 1 Enabled.");
  4    $END
  5  END;
  6  /
Debug Level 1 Enabled.
PL/SQL procedure successfully completed.
SQL>