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I've promoted about 2X speed by named pipe. First step:(create a named pipe) mkfifo p1 Second step:(waiting to convert) cat p1| iconv -f GBK -t UTF-8 > target.file Last step:(export to p1, see the sql scripts below) SET OPTION TEMP_EXTRACT_NAME1 = 'p1'; SELECT * FROM MY_TABLE; SET OPTION TEMP_EXTRACT_NAME1 = '';



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