ORA-30647：error retrieving access parameters for external table string.string
错误码
错误描述：error retrieving access parameters for external table string.string
错误原因：An error occurred when fetching the access parameters for the specified external or hybrid-partitioned table.
解决方法：If the access parameter is a query which returns a CLOB, check EXTERNAL_TAB$ to make sure the query is correct.
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