Desupport of Oracle Real Application Clusters (RAC) with Oracle Database Standard Edition 19c (Doc ID 2504078.1)
Desupport of Oracle Real Application Clusters for Standard Edition 2 (SE2) Database Edition
Starting with Oracle Database 19c, Oracle Real Application Clusters (Oracle RAC) is not supported in Oracle Database Standard Edition 2 (SE2).
Upgrading Oracle Database Standard Edition databases that use Oracle Real Application Clusters (Oracle RAC) functionality from earlier releases to Oracle Database 19c is not possible.
To upgrade those databases to Oracle Database 19c, either remove the Oracle RAC functionality before starting the upgrade, or upgrade from Oracle Database Standard Edition to Oracle Database Enterprise Edition.
For more information about each step, including how to reconfigure your system after an upgrade, see My Oracle Support Note 2504078.1: “Desupport of Oracle Real Application Clusters (RAC) with Oracle Database Standard Edition 19c.”
https://docs.oracle.com/en/database/oracle/oracle-database/19/upgrd/behavior-changes-deprecated-desupport-oracle-database.html#GUID-3BAFD95E-4D00-4F0F-BC80-6064F497F878
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