I have a question about performance with data management, I have to import several documents with header and lines, (about 240,000 lines), if I use a csv file then I will have to use two entities, one for the header and another one for the lines (and each line must contain the relation with the header), if I use xml I can use a composite entity which is, as I see, an ideal option for header and lines (in fact I have four tables in total) but I'm concern about performance, will be the process faster with csv?, or do I not have to be concerned about it?
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