Recently PRD system's performance became worse.
And I look for some trace, I found statics has not been updated since 12/08/2006.
ex; "Last analyze" of Table DBA_TAB_COLUMNS
I can't understand why this situation happend, because we have excuted command "brconnect -u / -c -f stats -t all" weekly.
And we did migration last Aug.
That is exactly last statics was updated.
At that time, we changed Oracle version( 8 → 9), Hardware(Server, EMC).
If someone experiences that problem or similar one, please tell me the reason and how to act.
Please help on this.