We had an issue where we were advised by oracle our stacksize was too small - Doing ulimit -Ss as the oracle user this showed 10240k (a previously recommended setting) - However when looking at an oracle process - pmon for example and then doing cd /proc/;cat limits - we would see the Max stack size of 2mb.... so it seems the 10mb setting was not having an effect
Oracle recommended adding the line "oracle soft stack 16384" to /etc/security/limits.conf but this line seems to have no effect on my servers (also of course re-booted after adding the line).
I'd be grateful if someone could shed some light on where it is actually being set
Do you use systemd? If you start database via script executed from SystemD then security/limits.config intentionally ignored. And you have to set limits one again in systemd unit file.