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Scalling application (cache (memcached [memkeš D] (commands (Rails.cache…

- - - - :memory_store (default cache)
      - :synchronized_memory_store (run in multi threads)
      - :file_store, "path"
      - :drb_store, ""
      - :mem_cached_store :+1:
      - (development.rb)
      - :compressed_mem_cached_store (gzip)
  - - - Rails.cache.read
      - Rails.cache.write
      - Rails.cache.fetch = create and read OR only read
      - Rails.cache.delete
      - Rails.cache.exists?
      - Rails.cache.increment
      - Rails.cache.descrement
      - Rails.cache.clear
      - :expires_id =>
  - - - use indexes (add_index :key1, :key2)
      - use include instead of join
      - query trace tracking and monitoring
      - drop to sql = execute, find by sql
    - - Master and slave
      - Database sharding