Re: How does PG know if data is in memory?

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Fabrício dos Anjos Silva wrote:
Is there any automated test tool? A can compile a list of real-world queries, and provide an exact copy of my db server just for testing. But how do I do it? Write a bunch of scripts? Is there any serious tool that try different parameters, run a load test, process results and generate reports?

There's a list of tools for playing back a test workload at http://wiki.postgresql.org/wiki/Statement_Playback

I'm not aware of anyone beyond some academic research that has taken that idea and built something to test many database parameter combinations. They did that at http://www.cs.duke.edu/~shivnath/papers/ituned.pdf but I don't think that code went public; I asked about it at one point and never heard anything really useful back.

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Greg Smith, 2ndQuadrant US greg@xxxxxxxxxxxxxxx Baltimore, MD
PostgreSQL Training, Services and Support  www.2ndQuadrant.us
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