SGA size..

[niceguy]

HI,

I'm a little lost with this SGA stuff. My box has 512mb of mem. I originally had sga size of:
share_pool=15mb
buffer_cache=25mb

when I ran a checktune.sql script:
goal: Value Action:
.99 1.00 Increase the share_pool_size
.90 .81 Increase the "

I don't want to allocated more then 100mb for sga.
what is the rule and applying the size of the sga?

should the buffer_cache be bigger then the share_pool?

any advice would be appreciated.

thanks

[Halo]

On a Unix box, the sum of SGA size(s) should not be more than half that available RAM on the box.