Explanation/Reference:
Explanation:
CE: The SERVER_CATEGORY is the name of a registered server category, used as part of server categorization. Oracle Clusterware standard Clusters and Oracle Flex Clusters have default categories of hub and leaf.
F: Server Category Attributes
You define servers into named categories, and assign attributes that define servers as members of that category. Some attributes that you can use to define members of a category describe the state conditions for the server, and others describe the physical characteristics of the server. You can also create your own characteristics to define servers as members of a particular category.
References: https://docs.oracle.com/database/121/CWADD/pbmgmt.htm#CWADD92638