In one of my databases, i have still some 50 ebooks in PDF that should be OCRd.
If i launch OCR on all, the OCR stops somewhere, and the OCREngine of DT takes 2-7 GB of memory in the activity monitor. How should i manage this problem?
Don’t launch OCR on all of them 
No, seriously. You should always be circumspect when trying to process large volumes of data like that. I’d personally suggest queuing up a maximum of 5 at a time, but that would also depend on the size and number of pages in each.
Remember: Just because something technically can be done, doesn’t mean it should be done. I can technically hammer nails with one of my bass guitars, but I would likely be very unhappy with some of the effects of doing it 
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