Oracle数据库top10物理段

select owner, name, type, mega, tbs
  from (select owner,

               case

                 when segment_type = 'LOBSEGMENT' then

                  logical_name

                 else

                  segment_name

               end as name,

               segment_type as type,

               round(bytes / 1024 / 1024) as mega,

               tablespace_name as tbs

          from (select a.owner,

                       a.segment_name,

                       a.segment_type,

                       b.table_name || '.' || b.column_name as logical_name,

                       bytes,

                       a.tablespace_name

                  from dba_segments a, dba_lobs b

                 where a.owner = b.owner(+)

                   and a.segment_name = b.segment_name(+)

                   and a.bytes > 1020 * 1024 * 1024)

         order by bytes desc);