Precisely how to find freespace in tablespace Temp

DB version: 11.2.0.4

Platform: Oracle Linux 6.4

It seems that finding the space left in the temporary tablespace is not simple.

Question1.

These are the descriptions of column to see DBA_TEMP_FREE_SPACE

ALLOCATED_SPACE: Total allocated space, in bytes, including the currently allocated space

and used and the space that is currently allocated and available for reuse

Free_space: Total free space available in bytes, including the space which is currently assigned and available for

reuse and the space that is currently not allocated

http://docs.Oracle.com/CD/E11882_01/server.112/e40402/statviews_5062.htm#REFRN23627

I'm not native English, but aren't the words in red above for the column ALLOCATED_SPACE a wrong repetition?

Question2. In 10g, when you see zero space left in the Temp tablespace, allows us to add more space to the tablespace TEMP immediately to prevent ORA-1652: unable to extend temp segment . 11 g, is there an architectural change by what TEMP segments are recycled internally (like UNDO segments) so that we don't have to worry much when we see the 0 space in tablespace temp?

Question3. For the same database, the results of two queries are listed below. The news of freespace vary between QueryA and QueryB.

Which is the correct output; QueryA or QueryB?

-QueryA using dba_temp_free_space

Select nom_tablespace,

totalGB tablespace_size/1024/1024/1024,

AllocSpaceGB ALLOCATED_SPACE/1024/1024/1024,

free_space/1024/1024/1024 FreeSpaceGB

of dba_temp_free_space;

NOM_TABLESPACE TOTALGB ALLOCSPACEGB FREESPACEGB

------------------------------ ---------- ------------ -----------

TEMP 125.99707 125.748047 69.9150391

-QueryB using v$ sort_segment

SELECT A.tablespace_name, D.gb_total, tablespace

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)

V $ sort_segment A.

(

SELECT B.name, C.block_size, SUM (C.bytes)/1024/1024/1024 gb_total

V $ tablespace B, v$ tempfile C

WHERE B.ts # = C.ts #.

B.name GROUP, C.block_size

) D

WHERE

D.name = A.tablespace_name

GROUP A.tablespace_name, D.gb_total;

TABLESPACE GB_TOTAL GB_USED GB_FREE

------------------------------- ---------- ---------- ----------

TEMP 125.99707 22.6992188 103.297852

So, this could mean that oracle will be reuse TEMP segments internally and Temp space needs to be increased if

you see errors ORA-1652 in the alerts log. Right?


I rarely answer even in this case.  It is usually a transient problem with enriched work.  Only when it becomes quite persistent to impact business operations should I address it.  When I receive an event, the first thing we do is to go to the guy in charge of the related enterprise application and ask if his phone rings.  If this isn't the case, I don't worry about this. And even if it causes a business problem, the solution may be to increase the size of the TS but to identify a particularly evil-wise query.  The last time that I had to deal with this error was due to a broad and complex query generating a large intermediate result set.  The solution should not continue to increase the TEMP TS (which turned out be "whack-a-mole") but to create a materialized view to reduce the amount of data that had to be picked up and joined running.

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