Определение размера таблиц

Для определения размера таблиц, я использую следующий SQL

SELECT table_name

     , TRUNC(SUM(table_size)/1024/1024)      AS table_size_meg

     , TRUNC(SUM(index_size)/1024/1024)      AS index_size_meg

     , TRUNC(SUM(lobsegment_size)/1024/1024) AS lobsegment_size_meg

     , TRUNC(SUM(lobindex_size)/1024/1024)   AS lobindex_size_meg

     , TRUNC(SUM(table_size      +

                 index_size      +

                 lobsegment_size +

                 lobindex_size)/1024/1024)   AS sum_meg

  FROM (SELECT segment_name AS table_name

             , bytes as table_size

             , 0     as index_size

             , 0     as lobsegment_size

             , 0     as lobindex_size

          FROM user_segments

         WHERE segment_type = 'TABLE'

         UNION ALL

        SELECT i.table_name

             , 0       as table_size

             , s.bytes as index_size

             , 0       as lobsegment_size

             , 0       as lobindex_size

          FROM user_indexes i

             , user_segments s

         WHERE s.segment_name = i.index_name

           AND s.segment_type = 'INDEX'

         UNION ALL

        SELECT l.table_name

             , 0       as table_size

             , 0       as index_size

             , s.bytes as lobsegment_size

             , 0       as lobindex_size

          FROM user_lobs l

             , user_segments s

         WHERE s.segment_name = l.segment_name

           AND s.segment_type = 'LOBSEGMENT'

         UNION ALL

        SELECT l.table_name

             , 0       as table_size

             , 0       as index_size

             , 0       as lobsegment_size

             , s.bytes as lobindex_size

          FROM user_lobs l

             , user_segments s

         WHERE s.segment_name = l.index_name

           AND s.segment_type = 'LOBINDEX')

 GROUP BY table_name

 ORDER BY sum_meg DESC

файл table_size.sql