Error while updating table in database.

Question

Hi,
While updating a table I came across following error-
ORA-01552: cannot use system rollback segment for non-system tablespace 'USERS'
I have following undo parameters set in my parameter file-
undo_management=auto
undo_tablespace=UNDOTBS1
If I have seperate undo tablespace then why Oracle is trying to use System undo segments?
Thanks,

Answer 1

Let's assume your settings are correct. However the error means you don't have an UNDO tablespace available. It could be because your tablespace doesn't exist, or you think you have started up your instance with this initialization parameter file.
You should make sure you have your undo tablespace attached to your database, and you are using your correct initialization file.
Have you edited this parameter in your pfile? Or have you configured this parameter in you spfile?
Issue a query against v$rollname, you should see something simmilar to this:
SQL> SELECT * FROM V$ROLLNAME;
USN NAME
0 SYSTEM
1 _SYSSMU1$
2 _SYSSMU2$
3 _SYSSMU3$
4 _SYSSMU4$
5 _SYSSMU5$
6 _SYSSMU6$
7 _SYSSMU7$
8 _SYSSMU8$
9 _SYSSMU9$
10 _SYSSMU10$
If you can't then definitely you are not starting up your database with undo segments.