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AB correct - no doubts
D is correct instead of C, because - on the PDB level you manage resources more/less the same as in non-CDB database hence you can limit uncommitted UNDO per consumer group:
https://docs.oracle.com/database/121/ADMIN/dbrm.htm#ADMIN11853
while from CDB level you cannot limit CPU on particular session level in PDB (it can be done on PDB level) but you can "only" limit CPU generally for particular PDB:
https://docs.oracle.com/en/database/oracle/oracle-database/19/multi/using-oracle-resource-manager-for-pdbs-with-sql-plus.html#GUID-19400E80-882F-424F-A19A-9FEB54F83577
D: corect The amount of undo generated by users in a PDB can be implemented with a PDB-level resource plan
https://blogs.oracle.com/oraclemagazine/multitenant-database-management
Limit the CPU usage of a particular PDB
Limit the number of parallel execution servers that a particular PDB can use
Limit the memory usage of a particular PDB
Specify the amount of memory guaranteed for a particular PDB
Specify the maximum amount of memory a particular PDB can use
Use PDB performance profiles for different sets of PDB
A performance profile for a set of PDBs can specify shares of system resources, CPUusage, and number of parallel execution servers. PDB performance profiles enable you to manage resources for large numbers of PDBs by specifying Resource Manager directives for profiles instead of individual PDBs.
Limit the resource usage of different sessions connected to a single PDB
Limit the I/O generated by specific PDBs
Monitor the resource usage of PDBs
https://docs.oracle.com/en/database/oracle/oracle-database/19/multi/using-oracle-resource-manager-for-pdbs-with-sql-plus.html#GUID-075BDB11-8B9D-4061-98F6-8D4F07E3AB6D
and
https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-resources-with-oracle-database-resource-manager.html#GUID-514BDECF-BE80-4CCA-A00D-EF37C2CFC435
https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-https://docs.oracle.com/en/database/oracle/oracle-database/19/admin/managing-resources-with-oracle-database-resource-manager.html#GUID-A5C6447B-BFF5-4CCE-8114-8AD230375082
A,B,D are correct
You can specify an undo pool for each consumer group. An undo pool controls the total amount of undo for uncommitted transactions that can be generated by a consumer group.
and why not F
"When you create one or more PDB resource plans and there is no CDB
resource plan, the CDB uses the DEFAULT_CDB_PLAN that is supplied with Oracle
Database."
then A B F
A CDB-level resource plan specifies the number of resources allocated to each PDB. A PDB-level resource plan can be used to allocate resources among the consumer groups (a maximum of eight) within a PDB. So it's not correct to say that a CDB-level resource plan will limit session CPU utilization. I would go with ABF.
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