Posts Categorized: Pythian

Presentations for Ottawa Oracle User Group

The Ottawa Oracle User Group (OOUG) was kind enough to invite me to give presentations for a whole morning. The group was ultra engaged and asked a lot of good questions, so my usual 50-minute Big Data presentation ended up taking 100 minutes, and the rest of the content had to be squeezed a bit. I hope everyone had a good time!

Locks, Latches, Mutexes, and CPU Usage

So how is the actual “waiting on lock” implemented? How does session B, waiting for a transaction to commit started by session A, knows that the resource is free for use? To find out how it is implemented, I have traced Oracle foreground processes. I tried this on Oracle RDBMS 11.2.0.3 running on Linux. This is a excerpt of system calls being executed during a session waiting for a lock…

NoCOUG Contest: a Gentler, Saner Solution

The actual challenge calls for a more generic solution than originally described in the magazine. Because there is no glory in half-solving a problem, I had to come back to it. And because the Great Karmic Balance could probably use it, I thought I could take advantage of the broader scope to produce a solution more geared toward elegance and modernism.

First MySQL/MariaDB/NoSQL Latin American Event

The first MySQL/MariaDB/NoSQL Latin American event is on its way, and Pythian will have a MySQL guy there. Yes, Francisco Bordenave (Team 14 TTL) is going to be one of the speakers. I am presenting a conference about replication in MySQL, how to’s, and what’s new in newer versions. This is a very important event, and many of our friends will be there.

Should your ADR be on Shared Storage?

I was on an Exadata environment with four RAC instances when a fellow DBA created an incident package. It was no big deal, except that part of the adrci packaging procedure was to take a backup of the controlfile and include it in the incident package. Though the package was created successfully, the controlfile never made it.

New and Improved: Here Comes the Flood

In the last few weeks, I launched quite a few small releases to CPAN. Taken separately, they are hardly worth a full blog entry, but taken together, they’ll make for a lovely N&I entry. So if you have been wondering what I’ve been up recently, read more!

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