Code to delete all objects in a schema.

SET SERVEROUTPUT ON SIZE 1000000
BEGIN
  FOR cur_rec IN (SELECT object_name, object_type
                  FROM   user_objects
                  WHERE  object_type IN ('TABLE', 'VIEW', 'PACKAGE', 'PROCEDURE', 'FUNCTION', 'SEQUENCE','SYNONYM','TYPE','DATABASE LINK','TABLE PARTITION')) LOOP
    BEGIN
      IF cur_rec.object_type = 'TABLE' THEN
        EXECUTE IMMEDIATE 'DROP ' || cur_rec.object_type || ' "' || cur_rec.object_name || '" CASCADE CONSTRAINTS';
      ELSE
        EXECUTE IMMEDIATE 'DROP ' || cur_rec.object_type || ' "' || cur_rec.object_name || '"';
      END IF;
    EXCEPTION
      WHEN OTHERS THEN
        DBMS_OUTPUT.put_line('FAILED: DROP ' || cur_rec.object_type || ' "' || cur_rec.object_name || '"');
    END;
  END LOOP;
END;
/

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