DBA_SEGMENTS and Full scan

Hi

Actually a single request on the Dba_segments have 7 Full_scan on SYS.TAB$, SYS.TABPARTS$, SYS.CLU$ ... . Is there a way to contourn this problem ?

SELECT SUM(bytes)/1024/1024
 FROM DBA_SEGMENTS
  WHERE tablespace_name = 'TBDATA001'
    AND segment_type = 'TABLE'
/

Oracle version is 9.2.0.6
O.S. AIX 5.3 Received on Fri Jun 16 2006 - 04:24:19 CDT