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We have a Mongo database with about 400,000 entries, each of which have a relatively short (< 20 characters) title. We want to be able to do fast substring searches on these titles (fast enough to be able to use the results in things like autocomplete bars). We are also only searching for prefixes (does the title start with substring). What can we do?
If you only do prefix searches then indexing that field should be enough. Rooted regex queries use index and should be fast.