Memcached Presentation

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1) The document discusses caching user data and question stats in Memcached to improve performance of a Rails application that involves writing data to multiple database tables. 2) It describes using Memcached's atomic incr and decr operations to increment counters for question stats and generate unique IDs for user actions without using database locks. 3) The cached data is periodically written to the database in bulk using AR-Extensions to further improve write performance.

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