Comments on: Feeding Query Analyzer from DTrace

By: Mark Callaghan

Mark Callaghan — Wed, 19 Nov 2008 03:51:47 +0000

For dtrace to be interesting to me, you need to provide data I can’t get today from MySQL. If you limit this to static probes, then dtrace isn’t required as I can instrument the server today to get the same data and put it in a query log. What can you do with dynamic dtrace probes?

By: Harrison

Harrison — Sat, 15 Nov 2008 19:27:08 +0000

That seems pretty damn cool! It’s always interesting to see two neat technologies tied together like this.

By: Martin MC Brown

Martin MC Brown — Sat, 15 Nov 2008 16:08:57 +0000

Hi Kay!

I ran sql-bench on the MySQL server, which as you know runs millions of queries, and I didn’t drop any queries until I got to one of the tests that runs millions of small non-database calculation/function-based SELECTs.

However, since you’ve asked, I guess I ought to go test and compare.

By: Kay Roepke

Kay Roepke — Sat, 15 Nov 2008 16:03:00 +0000

MC,
this is awesome work!

Have you done any benchmarking on the performance effect of the probes yet?
It would be interesting to see how much overhead we suffer in a production environment (not much I’d bet )