Shmmax - kindly assist

Hi,
let's say i have a db server with the following databases:
STAR1 - 1GB SGA
STAR2 - 2GB SGA
STAR3 - 3GB SGA
How much do i have to set for shmmax?
The SHMMAX parameter is used to define the maximum size of a single instance? or the total memory of all the databases added up?
what other kernel parameters should i look out as well?
thanks

First, you didn't bother to mention what O/S or version of Oracle you're running!
Now, the SGA does not have to be smaller than SHMMAX. SHMMAX specifies the largest allowable single shared memory segment. If you specify an SHMMAX smaller than the SGA, then Oracle will allocate multiple shared memory segments, that total to the size of SGA that's specified.
If your system has an SHMALL parameter (I know Linux does, not sure about other flavors of Unix), it specifies the total amount of memory that can be allocated as shared memory. So, it must be set equal to or larger than the sum of the SGAs of all instances on your server.
Having said all that, to keep it simple, set SHMMAX to 3GB (max. of 1GB, 2GB, 3GB) and SHMALL (if your system has it) to 6GB (1GB+2GB+3GB).
Hope that helps,
-Mark

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