What differences if we kill SMON or we kill PMON Back ground processes ??

Hello
i am little bit confused.Please help me out...
If we kill PMON---->Instance crashed---->Alert log content
LGWR (ospid: 9764960): terminating the instance due to error 472
Instance terminated by LGWR, pid = 9764960
If we kill SMON---->Instance crashed---->Alert log content
PMON (ospid: 13041666): terminating the instance due to error 474
Instance terminated by PMON, pid = 13041666
2010-12-27 07:31:04.187000 +01:00
Then ,what is the difference in mechnism in killing either to SMON or PMON???

Oh..wait...I just asked this question due to curiosity about what happen INTERNALLY when we kill any BG process(specially mandatory).
For testing..I kill all the process in each attempt and found some similar and some different lines in alert log.
Kill PMON:
LGWR (ospid: 9764960): terminating the instance due to error 472
Instance terminated by LGWR, pid = 9764960
Kill CKPT:
PMON (ospid: 6553606): terminating the instance due to error 469
2010-12-27 12:08:51.650000 +01:00
Instance terminated by PMON, pid = 6553606
Kill SMON:
PMON (ospid: 13041666): terminating the instance due to error 474
Instance terminated by PMON, pid = 13041666
Now,is any knowledge about these error nos(472/469/474) ???
What happen internally when we kill PMON or SMON ??

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What happens if we kill SMON and PMON Back ground processes

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It is an interview question to me.
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I was unable to answer this, please let me know.
Thanks
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It's simple, If you kill them your instance crashes.
For further references on Basic Background Processes, and the reason why they must be always running as long as the instance is started, I suggest you to read Oracle Background Processes;
~ Madrid

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<u><i>Background Processing</i></u>
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      INVALID_JOB_DATA       = 2
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Will the oracle automatically perform recovery???
will the database startup?

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Here you can read about Oracle background processes:
http://www.dba-oracle.com/t_background_processes.htm
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http://download.oracle.com/docs/cd/B10500_01/server.920/a96524/c09procs.htm

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What differences if we kill SMON or we kill PMON Back ground processes ??

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