Question of SCT TEMP space means that kinds fail?

DB version: 11.2
Operating system: Solaris 10

We have a DB OLTP. These days, we regularly get
ORA-1652: unable to extend temp segment by 128 in tablespace TEMP
on our alerts log. About 7 to 8 times per hour.

TEMP tablespace size is 21 GB and it has 0 MB freespace for several days. So far end-users of application will have no high no concerns.

Question1.
This means that none of their SQLs requiring a sort have failed? Or did they not only noticed in their newspapers?



Question2.
If ORA-1652 meant SQLs application fails, what I can do to release the temp tablespace?

To diagnose why SMON is not clear the temp tablespace, I went through the note of ML
+ Temporary segments are not désallouées after a sort [ID 1039341.6] +.

SEGMENT_TYPE of my temp tablespace is not TEMPORARY. It is not permanent either.


Info on this Temp tablespace:



SQL> select owner,segment_type from dba_segments where segment_type='TEMPORARY';

no rows selected

SQL> SELECT TABLESPACE_NAME, CONTENTS FROM DBA_TABLESPACES WHERE TABLESPACE_NAME='TEMP';

TABLESPACE_NAME                CONTENTS
------------------------------ ---------
TEMP                           TEMPORARY

SQL> select OWNER,
       SEGMENT_NAME,
       SEGMENT_TYPE ,
       TABLESPACE_NAME
      from DBA_SEGMENTS
      where SEGMENT_TYPE = 'TEMPORARY';

  2    3    4    5    6  
no rows selected

SQL> SQL> select OWNER,
       SEGMENT_NAME,
       SEGMENT_TYPE ,
       TABLESPACE_NAME
      from DBA_SEGMENTS
      where SEGMENT_TYPE = 'PERMANANT';    

no rows selected

Max, to add to what has already been postponed Yes the error message means that one or more of the tasks requiring temporary tablespace failed. The question you need to ask is why? Your tablespace sorting could be set too small to cope with the workload or your system might suffer from an excessive burden for the space of sort. The temporary tablespace is used to support including stopped sorting by, select distinct, union, operations and also it hold temporary tables and hash area overflows to disk.

Bad SQL plans may resort to excessive use of the temp.

AdHoc queries via report ofter tools extract excessive amounts of data well beyond what the end-user needs and can indeed treat until the user launches a new version of the report.

Sometimes a little tuning can drastically reduce the demand for temp.

HTH - Mark D Powell.

Tags: Database

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