DECLARE  
    ANS T_ECMC_USERS%ROWTYPE; 
    START_TIME NUMBER; 
BEGIN 
    dbms_output.enable; 
    START_TIME := dbms_utility.get_time(); 
    FOR i in 1 .. 1000 LOOP 
        BEGIN 
        EXECUTE IMMEDIATE  
            'SELECT * FROM T_ECMC_USERS WHERE USER_ID = ' || i  
            INTO ANS; 
        EXCEPTION  
            WHEN NO_DATA_FOUND THEN NULL; 
        END; 
    END LOOP; 
    dbms_output.put_line(dbms_utility.get_time() - START_TIME); 
END;