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In this post i discuss two main options for scaling out mySql and compare between them. The first is based on data-base clustering and the second is based on In Memory clustering a.k.a Data Grid. I present a pattern that is referred to as Persistency as a Service (PaaS) which shows how to scale our existing data base without changing it through a combination of Data Grid and data base as a background service. I address many of the fequently asked question related to how performance, reliability and scalability is achieved with this pattern.