ORA-56731：pluggable database plan string may not use subplans
错误码
错误描述：pluggable database plan string may not use subplans
错误原因：An attempt was made to set a resource plan that contains subplans. Subplans are not supported in pluggable databases (PDBs).
解决方法：Specify a valid PDB resource plan or modify the specified plan to remove the subplan directives.
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