To check tablespace total size, free space, used and free percentage:
SELECT /* + RULE */ df.tablespace_name "Tablespace",
df.bytes / (1024 * 1024 * 1024) "Size (GB)",
SUM(fs.bytes) / (1024 * 1024 * 1024) "Free (GB)",
Nvl(Round(SUM(fs.bytes) * 100 / df.bytes),1) "% Free",
Round((df.bytes - SUM(fs.bytes)) * 100 / df.bytes) "% Used"
FROM dba_free_space fs,
(SELECT tablespace_name,SUM(bytes) bytes
FROM dba_data_files
GROUP BY tablespace_name) df
WHERE fs.tablespace_name (+) = df.tablespace_name
GROUP BY df.tablespace_name,df.bytes
UNION ALL
SELECT /* + RULE */ df.tablespace_name tspace,
fs.bytes / (1024 * 1024 * 1024),
SUM(df.bytes_free) / (1024 * 1024 * 1024),
Nvl(Round((SUM(fs.bytes) - df.bytes_used) * 100 / fs.bytes), 1),
Round((SUM(fs.bytes) - df.bytes_free) * 100 / fs.bytes)
FROM dba_temp_files fs,
(SELECT tablespace_name,bytes_free,bytes_used
FROM v$temp_space_header
GROUP BY tablespace_name,bytes_free,bytes_used) df
WHERE fs.tablespace_name (+) = df.tablespace_name
GROUP BY df.tablespace_name,fs.bytes,df.bytes_free,df.bytes_used
ORDER BY 4 DESC;
To check Temp tablespace total size, used and free space.
SELECT A.tablespace_name tablespace, D.gb_total,
SUM (A.used_blocks * D.block_size) / 1024 / 1024 /1024 gb_used,
D.gb_total - SUM (A.used_blocks * D.block_size) / 1024 / 1024 / 1024 gb_free
FROM v$sort_segment A,
(
SELECT B.name, C.block_size, SUM (C.bytes) / 1024 / 1024 / 1024 gb_total
FROM v$tablespace B, v$tempfile C
WHERE B.ts#= C.ts#
GROUP BY B.name, C.block_size
) D
WHERE A.tablespace_name = D.name
GROUP by A.tablespace_name, D.gb_total;
