We are in phase to upgrade our Oracle EBS Database 10g to 12c so therefore mentioned below are the steps we followed to upgrade the database with 12c dbua
we have upgraded our 10g database from 10.2.0.4 to 10.2.0.5 that is compatible for the direct upgrade on 12c with dbua
1-Installed the Oracle 12c software
2-Execute the Oracle EBS environment file which set the ORACLE_HOME and ORACLE_SID but not ORACLE_BASE for the database which is being upgrade
3-Go to the 12c ORACLE_HOME\bin and execute ./dbua
4-12c dbua GUI appeared but it is not picking the Database 10g in the Source ORACLE_HOME
what might be cause and how is this resolve
Check the /etc/oratab file.
Does it have the correct entries?