V$temp_space_header showing temp space fully utilized but not true

Question

hi,
any experience regarding temp space headeR?
currently we are experiencing this issue:
when using this:
SELECT tablespace_name, SUM(bytes_used), SUM(bytes_free) FROM v$temp_space_header GROUP BY tablespace_name;
TABLESPACE_NAME SUM(BYTES_USED) SUM(BYTES_FREE)
TEMP 227632218112 0
but when using this:
SELECT NVL(A.tablespace_name, D.name) tablespace,
D.mb_total,
SUM (NVL(A.used_blocks,0) * D.block_size) / 1024 / 1024 mb_used,
D.mb_total - SUM (NVL(A.used_blocks,0) * D.block_size) / 1024 / 1024 mb_free
FROM v$sort_segment A,
SELECT B.name, C.block_size, SUM (C.bytes) / 1024 / 1024 mb_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 NVL(A.tablespace_name, D.name), D.mb_total
TABLESPACE MB_TOTAL MB_USED MB_FREE
TEMP 217087 839 216248
is this a bug??
thanks.

Answer 1

Hi,
It may be the case that the operation you are doing needs more temp space than the amount of temp space that actually can be available.
Instade of looking at free and used temp space, You can look at the operation which needs that much amount of temp space. May be there is some way to minimize that..
Please share what actually are you doing when this problem is coming.
Regards,
Dipali