How to exclude recycling bin from tablespace usage calculations

Question

I have a generic query to tell me how much of a given tablespace is used. I want to exclude objects in the recycling bin.
in dba_segments these segments all have names that begin with BIN$
This is not the case in dba_extents where we get the calculations from. How do I exclude objects in the recylcing bin? Basically how do I exclude segments in dba_extents that are in the recycling bin
select      f.tablespace_name,a.total,
     u.used,f.free,
     round((u.used/a.total)*100) "% used",
     round((f.free/a.total)*100) "% Free",
     round(((0.10*u.used)-f.free)/0.9) "10%",
     round(((0.15*u.used)-f.free)/0.85) "15%",
     round(((0.20*u.used)-f.free)/0.8) "20%",
     round(((0.25*u.used)-f.free)/0.75) "25%"
from
(select tablespace_name, sum(bytes/(1024*1024)) total from dba_data_files group by tablespace_name) a,
(select tablespace_name, round(sum(bytes/(1024*1024))) used from dba_extents group by tablespace_name) u,
(select tablespace_name, round(sum(bytes/(1024*1024))) free from dba_free_space group by tablespace_name) f
WHERE a.tablespace_name = f.tablespace_name
and a.tablespace_name = u.tablespace_name
and a.tablespace_name=TRIM(UPPER('&&TS_NAME'))
/

Answer 1

You could join the two views or you could use dba_segments rather than extents in your query or you could use the built-in functionality rather than writing your own.
http://www.morganslibrary.org/reference/dbms_space.html
DBMS_SPACE.FREE_BLOCKS
DBMS_SPACE.UNUSED_SPACE