Query to check tablespace size and freespace

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select b.tablespace_name, tbs_size SizeGb, a.free_space FreeGb
from
(select tablespace_name, round(sum(bytes)/1024/1024/1024 ,2) as free_space
from dba_free_space group by tablespace_name) a,
(select tablespace_name, sum(bytes)/1024/1024/1024 as tbs_size
from dba_data_files group by tablespace_name
UNION
select tablespace_name, sum(bytes)/1024/1024/1024 tbs_size
from dba_temp_files
group by tablespace_name ) b
where a.tablespace_name(+)=b.tablespace_name;

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