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* First, in sharded environments, distributed locks could be expensive and slow. Mongo DB's goal is to be lightweight and fast.
* We dislike the concept of deadlocks. We want the system to be simple and predictable without these sort of surprises.
* We want Mongo DB to work well for realtime problems. If an operation may execute which locks large amounts of data, it might stop some small light queries for an extended period of time. (We don't claim Mongo DB is perfect yet in regards to being «real-time», but we certainly think locking would make it even harder.)
Краткий обзор membase — нового NoSQL решения от авторов memcached