SGA_MAX_SIZE and shmmax values

All,
My environment is
Oralce - 10.2.0.4.0
Two node RAC environment
Red hat Enterprise Linux 5 64 bit operating system
RAM size - 64 GB
shmmax - 4294967295 (one byte less than 4 GB)
SGA_MAX_SIZE = 3808M
SGA_TARGET = 3808M
PGA_AGGREGATE_TARGET=1000M
When I run the ADDM, it is telling that SGA was inadequately sized, increase the sga_target to 4760M. It says that 33% impact.
In my case, I need to increase SGA_MAX_SIZE.
I may be wrong, but from google, i assume that SGA_MAX_ZIZE can't be more than shmmax. Is it true?
If I have to increase the shmax, is it fine to increase to 5 GB based on ADDM recommendataion. Are there any harm to increase the shmmax to 20GB are so for safer side?
Any relation beween shmmax and RAM size?
If I have to alter the SGA_MAX_SIZE in RAC, I need to bounce the database or i can do one instance at a time right. If I am going with one node at a time, since it is a production, what will happen to the connections in that node when i am restarting that particular instance? I have a TAF policy of "Basic".
is it like all the select statements will be moved to survival node whereas insert, update and delete transactions will be broken?
Awaiting your help..

Always it is recommended to keep "shmmax" half the size of physical memory.
First you need to increase shmmax and then increase the SGA_MAX_SIZE as per ADDM.
See the below doc for all your answers answers.
http://download.oracle.com/docs/cd/B19306_01/install.102/b15668/toc.htm#BGBDFIGF
Hope this solves your issue.
Regards,
Satishbabu Gunukula
hthttp://www.oracleracexpert.com
Click here for solution - [ORA-19755 Error during recovery/DB startup|http://www.oracleracexpert.com/2009/09/ora-19755-could-not-open-change.html]
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Edited by: Satishbabu Gunukula on Sep 23, 2009 2:43 PM

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SGA_MAX_SIZE and shmmax values

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