What are the down sides with very big SGA?

Hi
I have a heavy 9.2.0.8 64-bit database with very high dataloading and reporting having 24G SGA, 80 dual core CPU solaris 9. I would like to figure out what are the down sides of very big SGAs, and/or if increases the SGA.
Thanks

user5797895 wrote:
My question was not for a particular performance issue. I am thinking in different possibilities to improve to the best performance. I have statspack configured and we do tuning according to the stats.
Are you able to anlyze few spreport and give me your comments?Usually you have one or more particular issues that are worth to look into, e.g. particular standard reports that take longer than expected, batch runs that don't complete within the given timeframe, end-users complaining about ad-hocs reports taking too long, transactions that start to time out during peak workloads etc. etc.
If you're just interested in someone checking the current state/health of your system it's probably worth a try to post the most important parts of some statspack reports that you determine to be most representative for your system load. There are definitely some contributers here participating that should be able to provide some valuable insights.
I think it's always good to remember that the most significant performance improvement of a system is achieved by letting it do less work resp. avoid unnecessary work. So if you're e.g. able to reduce the logical I/O performed by the top n SQLs that put the most workload on your system significantly you usually gain much more than by just adding more and more memory/CPU to your system. Of course this is not the case if this kind of tuning has already been performed thoroughly but there is usually much room for improvement in this field.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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