On Mon, 4 Apr 2016 16:45:37 +1000, Andrew Rowley wrote:

>A Hashmap potentially allows you to read sequentially and match records
>between files, without caring about the order.

Can you please explain what you mean by this? Are you talking about using 
the hashmap to determine which record to read next, and so to read the 
records in an order that is logically sequential, but physically random? If so, 
that is not at all like reading the records sequentially.

-- 
Tom Marchant

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