ORA-27101: shared memory realm does not existThis error usually has two reasons:
and see if you get the following values (or none if you've uninstalled already)
env | grep ORACLE
For 2) we have
The first one should verify that you have enough shared memory in your kernel parameters to serve your memory_target parameter. (Which value did you enter for that parameter, anyway?) You can also verify if the semaphore parameters ( sem ) have been setup as required.
sysctl -p |grep kernel df -k /dev/shm
I've checked and repeated steps regarding this issue few times (point 7 from the above tutorial for 11.10) but it didn't help.It's not just section 7 that's relevant for using memory target. I'm not sure if you read and applied all the steps of the guide you've referenced.
# df -k /dev/shmIt seems the mounted filesystem does not fit. As I mentioned before, "tmpfs" is needed.
Filesystem 1K-blocks Used Available Use% Mounted on
none 2877236 200 2877036 1% /run/shm
Seems to I made all steps from Oracle 11gR2 Express Edition on Linux Ubuntu 11.10 howto but after "/etc/init.d/oracle-xe configure" Oracle still says in logs: