What does the data look like? Ie. Numeric or strings? If numeric, what range? If strings, what length and alphabet?

It is often possible to do this task more quickly or more compactly (or both) than using a hash; if the data is, or can be transformed into something amenable to other methods.

With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority". I knew I was on the right track :)
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Fastest way to merge (and de-dup) two large arrays? by BrowserUk
in thread Fastest way to merge (and de-dup) two large arrays? by technojosh

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