JAVA J2EE 4 U

 SELECT

    SUM(space) * 8192 / 1024 / 1024 AS recyclebin_size_mb

FROM

    dba_recyclebin;

SELECT

    object_name,

    original_name,

    type,

    ts_name AS tablespace,

    droptime,

    space * 8192 / 1024 / 1024 AS size_mb

FROM

    dba_recyclebin

ORDER BY

    droptime DESC;