Oracle Database Discussions

Hi Guys,
When I startup my Database, I always see this error message printed in the trace file:

Error in executing triggers on database startup
*** 2005-12-09 11:12:42.817
ksedmp: internal or fatal error
ORA-00604: error occurred at recursive SQL level 1
ORA-12663: Services required by client not available on the server
ORA-36961: Oracle OLAP is not available.
ORA-06512: at "SYS.OLAPIHISTORYRETENTION", line 1
ORA-06512: at line 15
Error in executing triggers on database startup
*** 2005-12-09 11:12:42.869
ksedmp: internal or fatal error
ORA-00604: error occurred at recursive SQL level 1
ORA-06502: PL/SQL: numeric or value error: character string buffer too small
ORA-06512: at line 4

I have a few questions about the above message:

1. How can I see which database startup trigger is having this error? Is there a way to determine that?
2. Is there a way I can disable all triggers that fire on database startup? (just like we can disable triggers on a table)
3. Any idea what ORA-36961: Oracle OLAP is not available. means?

Thanks