推荐一篇MOS文档：How to Provision PDBs, based on CPU_COUNT (文档 ID 2326708.1)

简单来说就是先根据PDB负载情况确定CPU_COUNT，然后按比例设置，比如：服务器64C，配置某PDB16C，比例是25%

1、12c需要设置resource plan，18c+不需要

begin

  dbms_resource_manager.create_pending_area;

  dbms_resource_manager.create_cdb_plan_directive(plan => 'DEFAULT_CDB_PLAN', pluggable_database => 'PDB-X', shares => 16, utilization_limit => 25);

  dbms_resource_manager.create_cdb_plan_directive(plan => 'DEFAULT_CDB_PLAN', pluggable_database => 'PDB-Y', shares => 16, utilization_limit => 25);

  dbms_resource_manager.submit_pending_area;

end;

/

2、按比例设置相关参数：