No, you just have to make one pass through the data to split it into 100 pieces according to which hash is needed, then make one pass through each piece.

As for professional databases, databases are not magic. If you understand what they are doing then it is possible to outperform them. Usually you don't want to go there, but when you need to it can be done. I have personally done it several times.

In reply to Re^5: Working with large amount of data by tilly
in thread Working with large amount of data by just1fix

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