dimanche 29 janvier 2017

PostgreSQL performance testing - precautions?

I have some performance tests for an index structure on some data. I will be comparing 2 indexes side-by-side (still not decided if I will be using 2 VMs). I require results to be as neutral as possible of course, so I have these kinds of questions which I would appreciate any input about... How can I ensure/control what is influencing the test? For example, caching effects/order of arrival from one test to another will influence the result. How can I measure these influences? How do I create a suitable warm-up? Or what kind of statistical techniques can I use to nullify such influences (I don't think just averages is enough)?

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