It's covered in sphinx documents:

http://sphinxsearch.com/docs/manual-0.9.9.html#live-updates

But after reading it,I don't think it really can achieve that.

Have you guys ever also thought of this problem?

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I think that the terms live update indexing and almost real-time are terribly misleading. Perhaps incrementally updating index is appropriate for what sphinx is really doing there.

Having said that, for my applications of interest, the biggest limitation of the delta+main solution presented is that only new data is indexed with the deltas -- previously indexed data which has been updated in the db is not flagged for re-indexing.

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