Background ■ Backgroud Amazon Relational Database Service .t awsdocumentation >Cloud Computing>the number of Web services exploding elational Amazon RDS Best Practices maron ged with ■Decision Basis Amazon Simple Storage Service nmnlog >QoS(response time,throughput,availability et MySQL an Welcome to Amazon S3 Problem Oracle on >Everyone wants to invoke the one whose gos is the best. DB Instance >Is there a service suitable for everyone?No.>WhContext Service uery AP >So the real problem is which one should I invoke?obrton o Budkets SOAP API aries Operations on Objects ·Amazon S3 Resources e Command History Personalization Prediction tory 2017/615 XDU ZJUBackground  Backgroud ➢ Cloud Computing  the number of Web services is exploding 2017/6/15 4 Amazon Relational Database Service Amazon Simple Storage Service  Problem ➢ Everyone wants to invoke the one whose qos is the best. ➢ Is there a service suitable for everyone? No.  Why?  Context ➢ So the real problem is : which one should I invoke? Personalization & Prediction  Decision Basis ➢ QoS(response time, throughput, availability etc.) XDU & ZJU