ORA-07445 and ORA-01331end-of-file on communication channel

Question

Hi,
: Can any one help?
: We have an oracle server 8.1.7 on Solaris 8 sparc station.
: And after trying to run a select query on the database we are
: *** SESSION ID:(10.40322) 2001-05-09 13:56:06.479
Exception signal: 11 (SIGSEGV), code: 1 (Address not mapped to object), addr: 0xc7e25fe, P
C: dredseek()+396
*** 2001-05-09 13:56:08.069
ksedmp: internal or fatal error
ORA-07445: exception encountered: core dump [dredseek()+396] [SIGSEGV] [Address not mapped
to object] [209593854] [] []
Current SQL statement for this session:
SELECT ID, Kurztitel, KURZTITEL_BESCHR, Mittel, MITTEL_DEF, Wirkung, WIRKUNG_DEF, Status,
Person_ID, Patent_ID, Typ FROM ENTWICKLUNG WHERE ID IN (SELECT REFERENZ_ID FROM BEZUG WHER
E ID IN (SELECT ID FROM EMP WHERE ( CONTAINS(LAIM,'%drill%')>0 OR CONTAINS(DESCRI
PTION,'%drill%')>0) AND ( CONTAINS(LAIM,'%seal%')>0 OR CONTAINS(DESCRIPTION,'%seal%')>0))
) AND Typ!=4 AND Typ!=3 AND Typ!=5
: ORA-03113: end-of-file on communication channel .
: Sascha
null

Answer 1

Yes i am connecting through client side(TOAD).
When i continously execute the query then there is no problem. But problem occurs when i sits idle more than approx. 2 minutes.
Listner is properly running at server side.
Also while connecting though toad
1st Error is
Ora-12571: TNS: PAcket write failure
Ora-12541: TNS: No Listener
Then it connects.
What is the problem?
Where i can look into?
Thanks,