Review the output and if the assessment reports any fail, needs_action, or needs_inspection issues, read the remediation instructions for these issues and perform any required actions before proceeding with the upgrade.
Download the ISO file from Edelivery.oracle.com. Choose version OEL 7.5.
I am a big fan of automation. I don’t like to do the same thing over and over, so after reading the post about purge/rotate oracle trace and log files from Fred Denis I started testing his scripts to implement them.
Everything was perfect until I run adrci purge to clean rdbms old files from Oracle 12.1 and got error DIA-49803.
MOS 1957995.1 says that the default for the SQLNET.ALLOWED_LOGON_VERSION_SERVER setting has changed in 12.2 from 11 to 12. So if your client is not at least 188.8.131.52 or includes the CPUOCT2012 patch you will not be able to use the 12 setting.
It looks accurate as client 11.1 fails to connect to Oracle 12.2 and client 11.2 works: