I was glad to have the opportunity to join the MySQL developers
in Heidelberg for a few days, so thanks to MySQL for
the invitation. In between great food, quite a few beers and a
number of boat trips we managed to get a significant amount of
work done!
In what could be considered a follow-up to the engine summit at
Google following the MySQL User's conference, I joined Calvin
Sun, Brian
Aker, Jeffrey Pugh, Monty and others from MySQL and the engine
developing community to discuss things concerning storage
engines.
One of the main topics of the meeting was features and other
changes to the MySQL front-end as required by the engines. Some
of the requirements (such as an interface to the MySQL optimizer)
would really …
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After almost eight months of waiting, I am finally allowed to publish my thesis paper:
-
Design and Implementation of a Workflow Engine
This thesis discusses the design and implementation of a software component that faciliates the specification, management, and execution of so-called workflows. The discussion of this component's design includes the semantics and syntax of the underlying workflow model as well as the actual software design. The former builds upon the Workflow Patterns [BK03] terminology, the latter on the concepts of a Workflow Virtual Machine [SF04] and the idea that a workflow system should be comprised of loosely coupled components [DAM01, DG95, PM99].
The thesis paper is published under the Creative Commons Attribution 2.0 Germany license, the software that has been developed as part of this thesis has been released under the New BSD License as part of …
[Read more]A
Sometimes, you forget simple concepts when your head is deep into
the waters of solving other problems.
I dealt with a problem this weekend that was the result of code I
wrote that we use for regression testing. The code is designed
with a fairly simple concept: run all of our feeds and take the
output of how Grazr Feed Server code parses (that the
website/widget sees), store into MySQL the md5_hex of the OPML
and JSON in a table for a known good version. Then, you update
the code to the new test version, create a table with the same
schema as the results for the known good version, run the
regression again with the new code. When the regression for the
new code is completed, then you compare the two tables.
The problem that I encountered was that I was performing a join
against records that only existed for both data sets. Say for
instance, I run regression for the known good version and produce
30,000 records. Then I …
Actually let me address the items in the topic in reverse order. I have added support for recaptcha. I actually never got spam on this wiki, but I got plenty of it on my wiki (the observant of you will note that my wiki has also changed url as of today, but the old address will just redirect). So I decided to give this a try. I also finished the last round of he Swiss Coed Championships in Ultimate Frisbee this weekend. Unfortunately we did not manage to upset the favorites in the final, so we placed 2nd. I wasn't really happy with my throwing. I do know why this happend, so I will have to mark it as lesson learned. But I made a few nice dives which were caught on video, which I will hope will make it into the web soon.
Finally I made a few notes while attending the MySQL …
[Read more]Actually let me address the items in the topic in reverse order. I have added support for recaptcha. I actually never got spam on this wiki, but I got plenty of it on my wiki (the observant of you will note that my wiki has also changed url as of today, but the old address will just redirect). So I decided to give this a try. I also finished the last round of he Swiss Coed Championships in Ultimate Frisbee this weekend. Unfortunately we did not manage to upset the favorites in the final, so we placed 2nd. I wasn't really happy with my throwing. I do know why this happend, so I will have to mark it as lesson learned. But I made a few nice dives which were caught on video, which I will hope will make it into the web soon.
Finally I made a few notes while attending the MySQL …
[Read more]
It makes me sad that not more was done to promote this, and I
sure didn't do enough either. Well, I did email the Belgian user
group members.
http://www.mysql.com/news-and-events/events/emea-conference-2007/
* London, Tuesday, October 16th 2007
* Munich, Thursday, October 18th 2007
* Paris, Tuesday, October 23rd 2007
I can't attend all of them, but I'll try to go to Paris.
Tell your friends! Let us show there are people in Europe
interested in these!
Some time ago, I announced the MySQL UDF Repository. In short, the MySQL UDF Repository tries to be a one stop place to obtain high quality LGPL licensed libraries containing MySQL UDFs, including documentation and binaries. Since the announcement, our Google Group has grown to a 22 members (including a number of MySQL employees and prominent community members), and we've gained a few interesting new UDF libraries:
- lib_mysqludf_preg
- A library authored by …
It makes me sad that not more was done to promote this, and I
sure didn't do enough either. Well, I did email the Belgian user
group members.
http://www.mysql.com/news-and-events/events/emea-conference-2007/
* London, Tuesday, October 16th 2007
* Munich, Thursday, October 18th 2007
* Paris, Tuesday, October 23rd 2007
I can't attend all of them, but I'll try to go to Paris.
Tell your friends! Let us show there are people in Europe
interested in these!
So this is a real story about my best bud airline (large one, you
guess who). We have been together since the 80's when I picked an
airline that partnered with SAS to make sure we had links back to
the mother ship Sweden. It's been a ton of miles and I still have
that proud email they sent when I reach my 1,000,000 mile bar
(note to self, push the MySQL fulfillment project forward
quickly).
Well, time has passed on and my friend is showing a lot of aging,
and much is not pretty...
Today, in fact right now, Im onboard a flight from Washington DC
to Germany for our developer conference.
It all starts with a great idea. They have added a 'red carpet'
boarding lane for frequent fliers like me. So, if you're a 1k or
Global services or ponied up Euros or upgrades for Bus or First
class, you can stroll into the separate boarding lane at any time
with a nice red carpet and get that envy look from fellow coach …