Map lots of words to lots of integers

[Aahz Maruch]

In article <39188472.619823849 at news.online.no>,
5ÛHH575-UAZWKVVP-7H2H48V3 <thomas at cintra.no> wrote:
>
>In my application I need to make an intersection of several lists
>returned from lookups in the database, so if they`re all huge I might
>run out of memory. 
>
>I`m indexing files on cd-roms and the number of ids can be up into the
>millions.

Why not use a real database?  That's what they're for?
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