March 2019
Intermediate to advanced
394 pages
11h 4m
English
Content preview from Mastering MongoDB 4.x - Second Edition
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Performance comparison with replica sets
Developers and architects are always looking out for ways to compare performance between replica sets and sharded configurations.
The way MongoDB implements sharding is based on top of replica sets. Every shard in production should be a replica set. The main difference in performance comes from fan out queries. When we are querying without the shard key, MongoDB's execution time is limited by the worst performing replica set. In addition, when using sorting without the shard key, the primary server has to implement the distributed merge sort on the entire dataset. This means that it has to collect all data from different shards, merge sort them, and pass them as sorted to mongos. In both cases, network ...
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