I am running oracle database(version oracle8.0.5)
by the way I have had a few problem..
There were a error in alert log file
I want to know the meaning

in alert_log file

errors in file /ORACLE/app/oracle/admin/ORA806/udump/ora_ora806_21498.trc:
ORA-07445: exception encountered: core dump [SIGSEGV] [Invalid permissions for mapped object] [0] [] [] []

please reply.....please