i got SQL1220N on db2start (LINUX OS). after analysing, i found the ipcs -l shows interesting entries:
-bash-3.00$ ipcs -l

------ Shared Memory Limits --------
max number of segments = 2048
max seg size (kbytes) = 4194303
max total shared memory (kbytes) = 16384
min seg size (bytes) = 1

------ Semaphore Limits --------
max number of arrays = 1024
max semaphores per array = 250
max semaphores system wide = 256000
max ops per semop call = 32
semaphore max value = 32767

------ Messages: Limits --------
max queues system wide = 1024
max size of message (bytes) = 8192
default max size of queue (bytes) = 16384

"max total shared memory" is only 16M.
i'm woundering how to increase that value.
I have no exp on Linux administration, just woundering if anyone can give fast solution here?

note: When I look at the file /procs/sys/kernel/shmmax I see it already set to 512000000 but the shmmax from ipcs -l is still at 16384.

i know this is more like linux admin problem, just hope some one seen it before

That's a typical googly question. Since you've failed to mention your Linux distribution you'll have to figure out the answer by yourself.