v$filespace_usage tips

Question: What does the v$filespace_usage view contain?  Can you show an example query using v$filespace_usage?

Answer:  The v$filespace_usage view is used to display file space usage.  The DBA_TABLESPACE_USAGE_METRICS, queries v$filespace_usage, which keeps track of any MAXSIZE value may have set in autoextended datafiles. See percent used tablespaces.

Here is a sample query using v$filespace_usage:

select
   t.name, sum(f.allocated_space), 
   sum(f.file_maxsize),
   (sum(f.allocated_space)/sum(f.file_maxsize))*100
from
   sys.ts$            t, 
   gv$filespace_usage f, 
   gv$parameter param
where
     t.online$ != 3 
and
     t.bitmapped <> 0 
and
     f.inst_id = param.inst_id 
and
     param.name = 'undo_tablespace' 
and
     t.name = param.value 
and
     f.flag = 6 
and
     t.ts# = f.tablespace_id
group by
   t.name, 
   f.tablespace_id, 
   t.ts#;

Here is yet another query example:

select
   name,
   round(total/1024/1024) "Total (MB)",
   round(used/1024/1024) "Used (MB)",
   round((total-used)/1024/1024) "Free (MB)",
   round(used/total*100) "Usage (%)"
from
   (
    select
      a.name,
      sum(b.file_size * a.blocksize) total,
      sum(b.allocated_space * a.blocksize) used
    from
      ts$ a,
      v$filespace_usage b
    where
      a.ts# = b.tablespace_id(+)
    and
      a.contents$ = 0 -- exclude temp tablespaces
    and
      a.online$ < 3 -- exclude dropped tablespaces
    group by a.name
   union all
   select
     sh.tablespace_name,
     sum(sh.bytes_used + sh.bytes_free) total_mb,
     sum(sh.bytes_used) used_mb
    from v$temp_space_header sh
    group by tablespace_name
    )
order by 1;

References:

Bug 4203626 DBA_TABLESPACE_USAGE_METRICS / V$FILESPACE_USAGE may be wrong

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