ORA-65211：UPGRADE PRIORITY may only be specified for user PDBs
错误码
错误描述：UPGRADE PRIORITY may only be specified for user PDBs
错误原因：An attempt was made to specify UPGRADE PRIORITY for CDB$ROOT or PDB$SEED, which is illegal.
解决方法：Avoid explicitly specifying CDB$ROOT or PDB$SEED when changing UPGRADE PRIORITY.
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