Doubts in temporary files

Question

Hi all,
last week i did database-cloning using cold backup.
the steps i did is
1.)backed up the controlfile.
2.)shutdown immediate
3.)create passwordfile and made directories structures.
4.)edit the pfile
5.)startup nomount pfile
6.)exec.create controlfile scripts
7.)alter database open resetlogs
after i completed all these things database has opened.but after sometime user complaining about they faced temp.segment error.
Then when i checked the same in database.
(i.e)select name from v$tablespace where tablespace='TEMP':
NAME:
TEMP.
Next i checked,
SQL>select name from v$tempfile;
no rows selected.
why it happens?
is it mandatory to create the temp tbs separately in cloning?
or will it use the old tempfile?
i m very confused on this . pls advice me..

Answer 1

Hi,
what is the version of your DB.??
I am assuming your DB as 10g
I think you have heard of concept of Gather Schema Statistics.
In Oralce 10g, when the data of a table is grown to certain threshold value i.e. 10% of data, Automatically Gather Schema Statistics is performed on those tables.And also it needs enough free space in the temporary tablespace for sorting.
The TEST Database has recently been cloned from PROD Database. So, we realized that the step, adding a tempfile to the temp tablespace, was missed mistakenly. In fact the tempfile was copied and it is physically existing in the server, but not added to the TEMP tablespace as part of the cloning.
Solution:
ALTER TABLESPACE TEMP ADD TEMPFILE '/u01/app/oracle/product/10.2.0/oradata/test/temp01.dbf' REUSE;
After adding a tempfile to the TEMP tablespace, no errors generated regarding Gather Schema Statistics and temp tablespace afterward !!!.
I hope this will help you out.. !!
Thanks
Pavan Kumar N