Determining future space requirements

Question

Hello, I have been tasked with determining a clients future space requirements. We want to add enough tablespace files for thenm so they will not require any more for the next 2 years.
What queries can I run to determine their current tablespace usage that will geve me the most accurate indication of how much space is being used and how much space is remaining as wll as the maximum size for all tablespaces.
What other reports can I run to help me determine what files to add.
Thank you.

Answer 1

If you dont have benchmark then you can start collecting it now. The following query (from orafaq) will give you total, used and free space of tablespaces then start benchmarking the growth of them and then use that benchmark to have an estimate growth for x amount of time.
SELECT /*+ all_rows */ Total.name "Tablespace Name",
nvl(Free_space, 0) Free_space,
nvl(total_space-Free_space, 0) Used_space,
total_space
FROM
(select tablespace_name, sum(bytes/1024/1024) Free_Space
from sys.dba_free_space
group by tablespace_name
) Free,
(select b.name, sum(bytes/1024/1024) TOTAL_SPACE
from sys.v_$datafile a, sys.v_$tablespace B
where a.ts# = b.ts#
group by b.name
) Total
WHERE Free.Tablespace_name(+) = Total.name
ORDER BY Total.name;
Daljit Singh