When the application workload increases, there are two main options for achieving scalability at the database tier and make the application able to cope with more client requests :
In fact, the scaling up option has the main drawback that large machines are often very expensive and eventually a physical limit is reached where a more powerful machine cannot be purchased at any cost. Alternatively, it is both extensible and economical - especially in a dynamic workload environment - to scale out by adding storage space or buying another commodity server which fits well with the pay-as-you-go philosophy of cloud computing.
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