Linux Kernel Parameters:
Shared Memory SHMMAX 0.5*(physical memory present in machine).
Check your system for additional restrictions.
This setting does not affect how much shared
memory is needed or used by Oracle8i or the
operating system. It is used only to indicate the
maximum allowable size. This setting also does
not impact operating system kernel resources.
SHMMIN 1
SHMMNI 100
SHMSEG 10
Semaphores SEMMNI 100
SEMMSL Set to 10 plus the largest PROCESSES parameter
of any Oracle database on the system.
The PROCESSES parameter can be found in
each initsid.ora file, located in the
$ORACLE_HOME/dbs directory. The default
value of PROCESSES for the preconfigured
database created by Oracle Database
Configuration Assistant is 50.
SEMMNS Set to the sum of the PROCESSES parameter for
each Oracle database, adding the largest one
twice, then add an additional 10 for each
database. See "Configuring the Linux Kernel for
Oracle8i" on page 2-4 for an example of this
formula.
SEMOPM 100
SEMVMX 32767

Set the kernel parameters for shared memory in
/usr/src/linux/include/asm/shmparam.h and semaphores in
/usr/src/linux/include/linux/sem.h.
maximum size of a shared memory segment (SHMMAX)
minimum size of shared memory segment (SHMMIN)