I have upgraded from 8.1.7 to 9.2 in AIX 5.1, but when I started SQL*Plus and entered the user and password, this error appeared to me:
ORA-01034: Oracle not available ORA-27101: shared memory realm does not exist. IBM AIX RISC System/6000 Error:2: No such file or directory.
That message simply means that Oracle is not started. You either didn't get the database started back up yet or it's still in progress. When the database is actually started and running, you shouldn't get that message.
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