If you do run @?/rdbms/admin/catupgrd for an 126.96.36.199 Oracle Home on a 188.8.131.52, you may later realize some objects are missing (probably related to deferred segment creation).
SQL> delete from t1 2 where id in ( 3 select ca.id from ca, p 4 where p.no_form like '%02.98' 5 and p.id = ca.prod_id 6 ); delete from t1 * ERROR at line 1: ORA-00600: internal error code, arguments: [kkpo_rcinfo_defstg:objnotfound], , , , , , , , , , , 
The workaround on metalink is amazing :
- Do not run catupgrd in 184.108.40.206 against a database that is already at 220.127.116.11
Well, the only solution is to restore your database ! How painful