When performing the steps in the Oracle Upgrade Guide section "Configuring the upgraded 11g database", you receive the following errors:ORA-01507: database not mounted
1. Update the ORACLE_HOME environment variable in the file ".bash_profile" for the oracle and protect users per step 34 on page 56 in the Oracle Upgrade Guide.
2. Log out of the oracle and/or protect user session(s).
3. Restart the Oracle database service by running the command as root "service dbora restart".