Interesting things happen. And I learned (credits to Arun Gupta and others) that there is a change in Oracle Database 12.2 environments I wasn’t aware: The DBCA 12.2 does not update
/etc/oratab in GI / RAC environments. Let me give you some extra information and hints on this topic as it may cause some strange situations.
DBCA 12.2 does not update /etc/oratab in GI / RAC
Arun Gupta commented on the blog:
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Another case in point. DBCA fails to update the /etc/oratab file in 12.2 when a database is created. There is no documentation of this behavior. So, I opened