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Notes from the MongoBerlin Conference

At least 6 MongoDB talks summarized on topics like: BRAINREPUBLIC MongoDB case study, MongoDB internals, MongoDB indexing and query optimizer, MongoDB sharding internals, MongoDB replication internals, and scaling with MongoDB. I’ve found the ones on MongoDB internals quite interesting:

query optimizer:

  • it’s empirical, i.e. at first it tries all possible ways to get the results, and then remembers which one works best (it runs all algorithms in parallel and finishes as soon as one of them finishes), then reuses that knowledge in future requests
  • if the selected algorithm becomes very slow, it tries all possible ways again
  • so first time a query is called, it might be quite slow
  • on the other hand, if something changes later, e.g. an index becomes slow, Mongo will work around that

Original title and link: Notes from the MongoBerlin Conference (NoSQL databases © myNoSQL)