It's really hard to benchmark this sort of a thing. There are so many layers of caching and external factors that play into it, from all manner of sources including the operating system load and configuration, disk firmware, hardware configuration, and so forth; and the harder you try to isolate these effects, the farther you get from a realistic benchmark because all the factors that were removed are affecting real world performance in a big way.
This is a big reason why for a long time many large DBMS-providers had clauses in their licenses prohibiting 3rd party benchmarks. You can fairly easily construct a benchmark that makes any given DBMS seem great or awful, and there's no such thing as an objective test.
This is a big reason why for a long time many large DBMS-providers had clauses in their licenses prohibiting 3rd party benchmarks. You can fairly easily construct a benchmark that makes any given DBMS seem great or awful, and there's no such thing as an objective test.