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The recent rise of NoSQL provides an alternative model in building extremely large scale storage system. Nevetheless, compare to the more mature RDBMS, NoSQL has some fundamental limitations that we need to be aware of. 1. It calls for a more relaxed data consistency model 2. It provides primitive querying and searching capability There are techniques we can employ to mitigate each of these issue. Regarding the data consistency concern, I have discussed a number of design patterns in my previous blog to implement system with different strength of consistency guarantee. Here I like to give myself a try to tackle the second issue.