Have you collected stats on the fixed objects? dbms_stats.gather_fixed_objects_stats
I found that, x$kccfe which is used in the defenition of
dba_data_files (Now in 10.2 to give the >ONLINE_STATUS Of the data file) is causing the issue. But I have not yet gone in to the root
cause. Meanwhile, if you have more insight do let me know.
-- Alexander Fatkulin -- //www.freelists.org/webpage/oracle-l