INS-41711
The upgrade process upgrades the stack one node at a time, even though you selected to upgrade all nodes. Database service will be disrupted for any database that uses Oracle Automatic Storage Management (Oracle ASM), and that is not managed by Oracle Clusterware, or that uses Oracle Clusterware manual management policy. All other databases and services should not be affected, and should continue to function. If this is not desirable, then before proceeding with the upgrade, ensure that Oracle Clusterware manages databases using Oracle ASM, and set the automatic management policy on databases managed by Oracle Clusterware.
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