When running the DBUA, prerequisite check reports a warning with manual intervention. Detailed problem description as follow:
Starting with Oracle Database release 12.2, Exclusive Mode is the default password-based authentication mode. In Exclusive Mode, accounts which only have the 10G password version (see DBA_USERS.PASSWORD_VERSIONS) are no longer accessible. If your system has any account with only the 10G password version, Exclusive Mode must be switched off prior to the upgrade. See the Network Reference Manual chapter about the SQLNET.ORA parameter SQLNET.ALLOWED_LOGON_VERSION_SERVER for more details on Exclusive Mode. Refer to the Oracle Database Readme 12c Release 2 (12.2) for further information regarding Bug 22031049. (more details)
Exclusive Mode, exclusive_mode_auth, ALLOWED_LOGON_VERSION_SERVER, password_versions, , KBA , BC-DB-ORA , Oracle , Problem
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