To limit competition of resources (CPU, storage, tempfiles, etc) between the delivered schemas (OAX$OAC) vs. any custom schemas, is there an opportunity/is it supported in the product to have a custom schema being allocated under a separate PDB and/or create a separate non-low, medium, or high connection consumer group and assign to the custom schema sessions?
PDB creation and management: CREATE PLUGGABLE DATABASE (oracle.com) and DBMS_PDB (oracle.com)
Consumer group creation: DBMS_RESOURCE_MANAGER (oracle.com)