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What are the role of query profiling, query sampling, and query workload characterization in understanding the statistical properties of query workloads, identifying query hotspots, and

What are  the role of query profiling, query sampling, and query workload characterization in understanding the statistical properties of query workloads, identifying query hotspots, and prioritizing optimization efforts to maximize the overall throughput, latency, and resource utilization of database systems?

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