$IF $$plsql_optimize_level IS NULL OR $$plsql_optimize_level IS NOT NULL : PLSQL_OPTIMIZE_LEVEL « SQL PLUS Session Environment « Oracle PL/SQL Tutorial

1. Oracle PL/SQL Tutorial
2. SQL PLUS Session Environment
3. PLSQL_OPTIMIZE_LEVEL

SQL> CREATE OR REPLACE PROCEDURE check_expressions
  2  IS
  3  BEGIN
  4
  5  $IF $$plsql_optimize_level IS NULL OR $$plsql_optimize_level IS NOT NULL
  6  $THEN
  7     -- Placeholder
  8  $END
  9     NULL;
 10  END check_expressions;
 11  /

Procedure created.

SQL>