MySQL Query Profiling Tools — part 0, Maatkit Query Profiler

I’ve been checking out a new client environment. My mission is to figure out some of the characteristics of the queries being run, and if they’re “good” or “bad”. In my arsenal of “tools I really want to check out” has been Maatkit’s Query Profiler, it profiles a batch of queries, without granularity (at least not the way I ran it) to see what query is doing what. So I ran this against a production machine, read my results here

Oracle Grid Control: The Importance of Deleting the emkey

Oracle Grid Control documentation warns against leaving the emkey in the Grid Control repository, if it is not removed after it has been copied it is easy to decrypt data, like passwords. Oracle Management Service 10.2 uses several ways to protect these sensitive data, including Virtual Private Database and Password Encryption. To overcome the first one, you have to connect to the database as the SYS user, for the second one, you have to know the encrypted password form, the key, and the associated algorithm. Obviously, the key used to cipher the password is the emkey. So the next question is, “Where are stored the ciphered passwords?”.

Sheeri’s First Week at Pythian

The Pythian family got a new song last Monday — “Sheeri” means “my song” in Hebrew. I’ve been working at Pythian for over a week now, and I really like the work model, environment and culture.The Pythian model of training is “jump right in, and ask questions when you don’t understand something.” The teams are very good technically, and people routinely help each other out. My teammates have been known to work on something I’ve been meaning to get to, and nobody utters a word of complaint. It’s a great workplace. There is a link to a post on my own blog explaining how I got the job.

InnoDB’s Adaptive Hash

With the popularity of multi-core machines (and innodb_thread_concurrency) on the rise, we are seeing more issues with adaptive hash index semaphore deadlocks. I guess there finally is a benefit to having MySQL Enterprise — the ability to disable InnoDB’s Adaptive Hash. If you want, you can hack the source code and compile your own version of MySQL. Only 4 file changes are needed to make the workaround happen, and the changes are detailed here.

“Virtual UKOUG Event”

This message is for our readers mostly located in UK and Europe but keep reading even if you are far away geographically – nothing is impossible in our digital age and you might actually consider traveling there in case of desperate interest. Your feedback would be useful, either way. What I want to draw your attention to is that Jonathan Lewis has posted a call for attendees for a special event dedicated to virtualization technologies with Oracle. This event is considered by UKOUG and whether it happens or not depends on you.

Getting to Know Sydney

Going stir-crazy from sitting in with all the rain, I was looking for something to do. Paul (from the Pythian Group Australia office) suggested either shopping in Chatswood or going to Crows Nest. Crows Nest is a lovely area of town with lots and lots of shops and restaurants. They have a natural food store that serves organic coffee. Have I mentioned how big coffee is in Australia? You have to go to McDonald’s to get regular drip coffee like I am used to from Tim Horton’s. A few other things I have noticed since arriving here.

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