Oracle database has a lot of history and Linux in general has made a lot of progress and changes compared to other unix type systems in the same amount of time. That's why Oracle database and Linux are products for experts, which require a lot of know-how that you cannot possibly grasp in a few months. However, when done right offer better performance and flexibility than other similar products. When I installed Oracle Database the first time I had to do it serveral times until I was finally happy with the result. I spent a couple of days studying the official Oracle installation instructions, which used to be even more complex, depending on platform.
That is why I mentioned "in the case of ASMM" .
It looks you mistyped "SHMMAX applies to POSIX shared memory only (/dev/shm)". It should be "SHMMAX applies to System V shared memory only (/dev/shm)", isn't it?
Thank you for tuning link.
That is why I have virtual machine with linux + DB installed, verified and documented. Of course it is just a base for other installations. But, hope, a good base .
Thanks for noticing the error. I corrected my previous response and added another previous link which should hopefully explain it correctly. These things should not be easy to confuse, but it can happen when not refreshing the memory for a while.