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what if one of DBWn fails

SQL> select bgp.name,p.spid,s.sid
2 from v$bgprocess bgp,v$process p,v$session s
3 where bgp.paddr=p.addr
4 and p.addr=s.paddr;

NAME SPID SID
----- ------------ ----------
PMON 29891 1
DBW0 29893 2
DBW1 29895 3
DBW2 29897 4
LGWR 29899 5
CKPT 29901 6
SMON 29903 7
RECO 29905 8
CJQ0 29907 9
QMN0 29909 10

10 rows selected.

SQL> !ps -ef|grep 29893
orclhcc 29893 1 0 13:49 ? 00:00:00 ora_dbw0_HCC
orclhcc 30347 14908 0 13:52 pts/5 00:00:00 /bin/bash -c ps -ef|grep 29893
orclhcc 30349 30347 0 13:52 pts/5 00:00:00 grep 29893

SQL> !kill -9 29893

SQL> !ps -ef|grep 29893
orclhcc 30378 14908 0 13:52 pts/5 00:00:00 /bin/bash -c ps -ef|grep 29893
orclhcc 30380 30378 0 13:52 pts/5 00:00:00 grep 29893

SQL> select 1 from dual;
select 1 from dual
*
ERROR at line 1:
ORA-03113: end-of-file on communication channel

Conclusion:Instance crashes

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