I'm on SL and I also depend on Oracle 10g, so thanks for the note on the Seg Fault, that would be showstopper moving to Lion. Now, I get the ulimit error on SL

I'm on SL and I also depend on Oracle 10g, so thanks for the note on the Seg Fault, that would be showstopper moving to Lion. Now, I get the ulimit error on SL too, that's just that your "oracle" user is not authorized to set ulimit that high (it's in your oracle ~/.bashrc). You probably followed the installation instructions from Pythian (http://www.pythian.com/news/1937/quick-install-guide-for-oracle-10g-release-2-on-mac-os-x-leopard-intel/ http://www.pythian.com/news/1937/quick-install-guide-for-ora...), just like I did. If you didn't get that error before, maybe the Lion installation has reset the max processes limit. Here's how to check the current value: ojosilva@snow:~$ sysctl kern.maxprocperuid kern.maxprocperuid: 266 Change it like this (so it matches the ulimit -Su and -Hu values in oracle's .bashrc): sudo sysctl -w kern.maxprocperuid=512 Maybe that will cure your segfault. Read thru the Pythian page and recheck all your sysctl parameters. Let me know how it goes.