Shared Nothing, the term is used in clustering model, eg. Exchange, DBMS, etc. There any 2 main kinds of resource sharing between servers in cluster model.
1. Shared Nothing: in this model, the servers in cluster need to communicate through some other kinds of connection like: Network, heartbeat to share and access information
2. Shared Resource (i don't remember, will update later) in this model, the severs in cluster share harddisk, memory, etc. it can boost the performance of the system, but the trade off is single-point of failture
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