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Query Optimization on Aurora
On Aurora, you need to pay for IO. If your database doesn't fit the buffer pool, share buffers, and your queries are not optimized, they do a lot of work with disk. In this case, your unoptimized queries hit your bill. So if you optimize them, you reduce your spending, which is good. query optimization on Aurora directly leads to cost optimization. On cloud computing: "I don't know why RDS doesn't have spot-insensors"