The ORACLE_BASE should be /oracle/<DBSID> in oracle 12c.
But it was changed to /oracle after upgrade by using SUM SP21 patch 1 for AIX.
Oracle 12c, SUM1.0 SP21 patch1, AIX
KBA , BC-UPG-TLS-TLA , Upgrade tools for ABAP , BC-DB-ORA-SYS , Database Interface / DBMS for Oracle , Problem
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