Q: We are in the process of comparing benchmarks for various enterprise-wide data warehousing platforms. How do I define the performance benchmarks? What should be the definition of complex, medium and simple query, and what should be the expected response timings?

The vendors who run benchmarks will be happy to give you their profiles of simple, medium and complex but becauseyou are planning to implement something in your environment, it's more important for you to use your own profiles especially for the complex queries. Validate your profiles against those of the vendors, but ask your power users about their complex queries, what they have experienced in the number of tables joined, the number of rows returned, and any machine-intensive calculations performed. You need to know the volumes and distribution among the simple, medium and complex. Because you are performing the benchmarks to determine your platform, and because you do not want to have to change out platforms as you grow, be sure to build the benchmark using volumes that are at least three times your expectations. With success, your volumes of data and your volumes of concurrent users will grow by three times.

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