SQL*Loader-00567：unable to derive file name\n
错误码
错误描述：unable to derive file name\n
错误原因：An error occurred while attempting to build a name for a data file, bad file, discard file or log file.
解决方法：Instead of relying on SQL Loader to build these file names, try specifying full file specifications for these files in the control file or on the SQL Loader command line.
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