Smon not clearing my temp tablespace

Question

hi guys,
even after I shutdown and restart my instance, my temp tablespace is showing as having 27.5 out of 30G used. why is this happening?
thanks

Answer 1

Hi OracleGuy777,
It is "normal" that temp tablespaces appear full, as the segments are not de-allocated. To know how much space is being used by active queries and to know if your are about to run out of temp tablespace use v$sort_usage and v$sort_segment.
E.g.:
These were for 8i/9i - should be OK in 10:
select TABLESPACE_NAME,TOTAL_BLOCKS,USED_BLOCKS,
FREE_BLOCKS, round((used_blocks/total_blocks), 2) "PERC_USED"
from v$sort_segment;Or:
SELECT A.tablespace_name tablespace, D.mb_total,
SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_used,
D.mb_total - SUM (A.used_blocks * D.block_size) / 1024 / 1024 mb_free
FROM v$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 A.tablespace_name, D.mb_total;or for user details:
SELECT a.sid, a.username, a.osuser, a.program, a.tablespace_name,
a.bytes "BYTES_USED", round(a.blocks / b.total_blocks,3) "PERC_USED"
from (select sor.tablespace_name, ses.sid, ses.username,
ses.osuser, ses.program, sor.blocks, sor.bytes
from (select /*+ optimizer rule */ u.tablespace "TABLESPACE_NAME", u.session_addr,
sum(u.blocks) blocks, sum(u.blocks) * &blksize bytes
FROM v$sort_usage u GROUP BY u.session_addr, u.tablespace) sor,
(select /*+ optimizer rule */ saddr, sid, username, osuser, program from v$session) ses
where ses.saddr=sor.session_addr) a, (select tablespace_name, sum(decode(maxblocks,0,blocks,maxblocks)) "TOTAL_BLOCKS"
from dba_temp_files group by tablespace_name) b
where a.tablespace_name=b.tablespace_name order by a.bytesCheers,
Francisco Munoz Alvarez
http://www.oraclenz.com