Restrictions for Oracle Grid Infrastructure Downgrades

Review the following information for restrictions and changes for downgrading Oracle Grid Infrastructure installations.

  • You can downgrade Oracle Grid Infrastructure to an earlier release only if you did not make any configuration changes after the upgrade.

  • When you downgrade from an Oracle Grid Infrastructure 12c Release 2 (12.2) to Oracle Grid Infrastructure 11g Release 2 (11.2), you downgrade from an Oracle Flex cluster configuration to a Standard cluster configuration since all cluster configurations in releases earlier than Oracle Grid Infrastructure 12c are Standard cluster configurations. Leaf nodes from the Oracle Grid Infrastructure 12c Release 2 (12.2) cluster are not be a part of the Oracle Grid Infrastructure 11g Release 2 (11.2) standard cluster after the downgrade.

  • You can only downgrade to the Oracle Grid Infrastructure release you upgraded from. For example, if you upgraded from Oracle Grid Infrastructure 11g Release 2 (11.2) to Oracle Grid Infrastructure 12c Release 1 (12.2), you can only downgrade to Oracle Grid Infrastructure 11g Release 2 (11.2).

  • If the cluster has Hub and Leaf Nodes, then the last node to be downgraded must be a Hub Node.