When I installed Oracle 9i (9.2.0.1.0) on Redhat Linux (AS 3), the installation went OK. But when the DBCA started to create the database, the error message "ORA-27123: unable to attach to shared memory segment" was produced. I cannot have any database installed in my machine. I really do not know what is wrong. Your help will be greatly appreciated.
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The most common reason for the ORA-27123 error is that you have not correctly configured your kernel to support the Shared Memory Segments that Oracle requires on Unix/Linux platforms. The Oracle Installation Guide fully documents the kernel changes you need to make in order to fix your problem. You can find these steps here.
In the /proc/sys/kernel directory, you'll need to modify the shmmax, shmmni and shmall config files as described in the above documentation.
This was first published in February 2006
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