I don’t get to the MySQL Developer Zone main page often enough. In thinking about what pages I view everyday or regularly, it doesn’t rate as high as Planet MySQL, MySQL Forums or even the MySQL Forge.

I was most dissappointed in the results of a recent poll What did you think of the 2006 Users Conference?. The top response was I had no idea there was a Users Conference. That’s not good to see this.

An interesting poll What are you most looking forward to at the MySQL Users Conference (April 24-27)?, the clear winner was Drinking beer with MySQL gurus. What does this say about the attendees. Either they are all alcho’s or the just want to be around guru’s in a less technical way.

I see this page also has a live feed of Planet MySQL. Perhaps we should get some more stuff down the right side of PlanetMySQL like the current Quick Poll itself and a feed of the current developer articles at the Developer Zone.

Finally back home after some R&R at Yosemite before leaving the US. In conclusion, to sum up my experience of the 4th Annual MySQL Users Conference “Excellent”.
Here’s my take. Friends, Functionality & New Features, the Future.

Friends

I’ve used MySQL now for over 6 years, and full time for a number of years, yet I’ve only become active in the MySQL community, particularly Planet MySQL in the past 6 months. Over that time, I’ve read a lot from members, and heard from many people. It was great at the conference to meet many of these people for the first time. The list includes: Community Members – Frank Mash,Mike Kruckenberg, Markus Popp, Roland Bouman, Giuseppe Maxia and Paul McCullagh. MySQL Employees – Mike Hillyer, Colin Charles, Jay Pipes, Mike Zinner, and New Contacts – Kristian Köhntopp, Jeremy Cole, Sheeri Kritzer, Taneli Otala, Laura Thompson just to start the list.

Functionality

Not only was there plenty of discussion on Server Functionality, there was plenty of MySQL Client functionality including the MySQL Workbench, MySQL Migration Toolkit and the other MySQL GUI products.
There were a number of discussions on uses and implementations of MySQL in large web deployments. It would be great to see some more white papers here.

New Features

A few months ago I wrote an article A call to arms!. In some part, I was just giving my opinion and hoping to gee up some support and feedback from the community. Well, the MySQL 5 Pluggable Storage Architecture got a great boost with announcements of transactional storage engines Falcon by Jim Starkey, Solid and PBXT. Add details of InnoDB New Features, MyISAM additions, and indications of other wonderful if not entirely practical options. I’m sure there is much more in stall to come this year that wasn’t discussed.

A number of talks featured Cluster including Monday’s tutorial, and with 5.1 and beyond I can see next year there will be more discussion on successful Cluster implementations. There was a lot of talks about Scaling out. I’d like to see more practical examples, perhaps a detailed tutorial.

The Future

What does the future hold for MySQL? The MySQL Server and Storage Engine Roadmap provided an insight of the upcoming planned features and releases over the next 2 years. Of course, the marketplace can change quickly, and MySQL is in a great position to react to the needs of the community quickly.

And before your know it, the 5th Annual MySQL Conference will be in play.

Conference Feedback

One thing I had a chance to discuss with Jay Pipes after the conference, I wasn’t the first to mention, and plans are already in motion, was a number of talks just needed more time. Moving the schedule to 55 minute talks gives that extra time, even if it is open question time from the floor, but it also makes knowing when sessions are on much easier, if they always start at the top of the hour.

In Conclusion

Frank (a.k.a Farhan Mashraqi) asked me what session I liked the most? Hard to say. Agile Database Techniques: Data Doesn’t Have to be a Four-Letter Word Anymore rated very highly, as the content was close to heart and my expertise. HackFest B: Creating New SHOW Commands by Brian Aker, showed just how easy it was to get into the MySQL source. Of course the internals are much more complex then this, but it was a good introduction. My favourite keynote was The Ubuntu Project: Improving Collaboration in the Free Software World. There were a number of talks I was disappointed in, as well as a number I didn’t get to due to 8 sessions in parallel.

I would have to say, that what impressed me most was no one single talk, but the functionality of the GRT Shell that Mike Zinner and his team have built into the GUI product line. I was very impressed, and I could see this providing extensive functionality and not just MySQL specific centric tools. This will be area I’ll be focussing on my contributions in the near future.

Another one of the sessions at the MySQL Users Conference I attended was Tuning MySQL5 SQL and Stored Procedures by Guy Harrison from Quest Software. A global company with 6000+ customers.

Guy has written a number of Oracle Performance Books in the past. His work now is on the “Spotlight” product family – Database diagnositic tools converting data to graphical representations. For these products, MySQL 5 and InnoDB only is necessary, simply due to accessing the right internal information for presentation. There are Freeware MySQL product downloads.

In this presentation he stated, nothing he was talking about specifically was relatively new. He did make quite a funny comment, “He is now seeking refugee status in the MySQL Community”.

Guy is author of O’Reilly “MySQL Stored Procedure Programming” Book. I managed to get for free at the conference from the MySQL Quiz night, in addition to a shirt and cap for stumping a Guru.

His talk were on tools and techniques for tuning MySQL.

• Explain Command – reveals what the optimizer intends to do
• Explain Extended

mysql> explain extended select ...;
mysql> show warnings G
Shows what the optimizer actually did. In this example, An IN was converted to EXISTS

There were 4 ways to provide optimizer hints.

1. STRAIGHT_JOIN
2. USE INDEX(…)
3. FORCE INDEX(…)
4. IGNORE INDEX(…)

In addition to the Show Query Log, there are Innodb specific commands, two in particular.

show status like 'innodb%'
* innodb_buffer_pool_read_requests
* innodb_data_read

Indexing and the optimizer

• In MySQL Index is the best tool to improve performance, however sometimes it’s better to access the entire table.
• Indexes generally effective when between 5% and 20% of rows are accessed.
• Subqueries need to be satisified by an index or performance will be quite inefficent.
• Overloading indexes with additional columns when key queries only use a few columns can enable improved performance.

Not all indexes are created equal. In the following examples, each advancement improved performance.

• No indexes ()
• Single Index (customer)
• multiple indexes (customer, product)
• concatenated indexes (customer + product)
• covering index (including required columns, customer+product+qty)

Examples of SQL that can’t benefit from Indexes.

• Derived tables – SELECT table in a from clause, creates a temporary table and will never get an index.
• Views with UNIONS/GROUP BY

A comment from the audience was that derived tables can be of a benefit to a correlated sub-query in specific examples.

Stored Procedures provided a mixed blessing for performance.

• Can improved perfomrance when high network overhead.
• Some improvement on parsing.
• Breaking up complex queries may provide benefits.
• SQL is highly optimized for SET operations.
• SP is not optimized for number crunching. Computionally not a fast language.

A written routine to calculate prime numbers provided the following performance (from most expensive to least) MySQL SP, Oracle SP,PHP,Perl,Java ,VB.NET ,C (gcc). This showed an example that was excessively inefficient. On the other hand, if the program is network dependent (e.g. access a million rows, perform some statisical aggretation). Comparatively the same between Java and SP locally, but much better in a remote host mode.

Performance of SQL in a SP will dominate overall performance. Where SQL is tuned, goto tried and proven traditional optimisation techniques.

• Optimize iterations
• Optimize Logic/Testing
• Avoid recursion

Loop Management

• Only perform necessary code within iterations
• LEAVE or CONTINUE when possible in loops
• Test the most likely IF/THEN statements first
• extract if comparisions duplicated to produce nested if’s (within reason)

Some guidelines for Triggers.

• Triggers will have a non-trival overhead for even the simplest trigger.
• Due to FOR EACH ROW only, don’t have expensive SQL in any trigger.
• Very carefully tune SQL in triggers.
• Empty trigger produced 12% overhead.

For more information check out www.quest.com/mysql

I didn’t take any photos myself at the MySQL User’s Conference. In reflection, perhaps I should. I did make it into some photos however. A few of them here.

Stolen from Jeremy Cole’s Photos at http://jcole.us/gallery/uc2006

Thursday’s Keynote speaker at the MySQL Conference was Mark Shuttleworth talking on The Ubuntu Project: Improving Collaboration in the Free Software World.

Ubuntu from Canonical Ltd is fastly becoming one of the most popular Linux Distributions, based on Debian. Here were some notes from his presentation. Mark had some really powerful one or two line slides that typified both his presentation intention and the goal of Ubuntu.

Delivering on the Promise of Free Software

• MySQL levelled the playing field, individuals could use MySQL to build applications that could now compete in the industry.
• Apache, Python and Linux made it all possible.
• This has provided the Opportunity and passion to build software that can serve a purpose.
• Ubuntu is the continuation of levelling the playing field. Making always available at no cost.
• Whatever your vision, you have the opportunity without financial limitation.
• To be a pioneer in new fields, open source freedom enables the opportunity to anybody.

The New Deal of Free software

* Different Economics

• Ubuntu is world class and free of charge.
• Important to recognise the governence.
• We don’t build 99%, it’s built by communities. We want to maintain good healthy and open relationships with the communities of software developers and contributors.

* Different culture

• Transparency. You can participate, you get to see how the software is built. Difficult for co-ordination of people worldwide, the advantage is you get to be people in the public space everywhere.
• To be able to try, experience to express their own inspiration.

Our vision is to build a complete community-driven distribution that can grow and substain itself through support and services.

Self substaining at a professional level. Community Driven.

• The Ubuntu Proposition
• Genuine Freedom and Flexibility
• Zero Licensing Fees
• Certification: Hardware, Softare, Skills
• Superb Commercial Technical Support
• Standards Compliance
• Internatiolzation and customization
• Collobaration to the Core

We do the best work when we focus on extreme challenges.

Mark made a great comment about the Chinese Version, What was in English on any pages, for Mark was the saving grace, but for the Chinese user, that was the wall, so a committed emphasis on Internationalisation was important.

Ubuntu as you know it today is widely rated #1 desktop Linux with millons of users globally, with complete office and home desktop distributions. We started on the desktop, we are continuing to expand into different variants including the enterprise. The next release in June 2006 – Dappy – 6.06 will includ LTS (Long Term Support) 3 years for Desktop, 5 years for server.

We maintain relationships with the community ecosystem.

• Looking the the User Relationships.
• Prime focus is simplicity. Also Comprehensive and Community, Current.
• For the business relationships, wanting to offering Tiered Partnership Program and Extensive Global Solutions Provider Network.

Free Software Relationships

• Close to upstream (e.g. MySQL, Apache, Firefox etc)
• Close also to other distributions (both debian based and not). We want the best of their work to also be part of what’s available to all.
• Need to ramp up the collaboration of projects especially between projects. Check out launchpad.net
  Site – Much easy to colloborate across projects
• With MySQL and Ubuntu you have freedom to deploy without asking permission, and support when and where you need it
• A key is make packaging ubuntu and mysql the best getting contributions from the community. Expresses most powerfully what MySQL can do.

Beating history into submission

• We judge ourselves by history. We should look at our strengths. we should ask “What futures are enabled.”

Free software enables a different economic paradigm.
Embrace it.

A question from the audience was where does the name Ubuntu come from. The Answer was.
Ubuntu is common to many African languages. It means “human-esse”. The Ubuntu root is common to a lot of words. Some means included “The way we look after other people defines who we are. ”

Kubuntu – Has a meaning “For Humanity”.

My talk at the MySQL Users Conference went well. MySQL For Oracle Developers was part of two talks, the second was by Mark Leith on MySQL For Oracle DBA’s.

I had a number of positive comments from attendees, including Ken Jacobs of Oracle who also contributed some valuable information in comparision of UPDATE/DELETE ORDER BY/LIMIT statements I was unaware of.

You can download my paper here.

My slides, like many talks just scratched the surface in the alloted. I’ve been working on additional reference material, a work in progress is available at MySQL For Oracle Developers. My continuatation on this will be dependent on feedback from the community of it’s intended value.

Everybody can contribute to the MySQL Open Source Community. Here are some ideas:

• You can start with completely a MySQL Conference Survey form (those forms that we are all avoiding).
• You can download, evaluate and test newer versions of MySQL Products.
• You can contribute to the MySQL Forums to ask questions and even give answers.
• Log Bugs & Enhancements on MySQL Products.
• Write about your experiences with MySQL in a Blog and add your Blog to PlanetMySQL. With now over 100 feeds, if everybody wrote something about MySQL in the next year, we would have over 1000 feeds next conference.
• Contribute your thoughts (via wiki), MySQL products, code snippets and examples to MySQL Forge (thanks Mike)
• You can even contribute to the MySQL Source Code.

If you are passionate about MySQL and you are attending the MySQL User Conference, then jump into the Open Source MySQL Community.

At the MySQL User Conference – MySQL Quiz Show we were asked to Stump a MySQL Guru. Well I submitted a few questions, and the first one stumped the guru, being Jeremy Cole, and my prize was a MySQL tee-shirt.

The Question: What are the current supported languages of the GRT Environment used in the MySQL GUI products?
The Answer: Lua, C, C++, Java, Python and PHP

Joe Kottke from FeedBurner in his MySQL Conference presentation today FeedBurner: Scalable Web Applications Using MySQL and Java mentioned a novel way of extracting SQL Select Statements from a MySQL Server.

The obvious MySQL ways include SHOW [FULL] PROCESSLIST, the Slow Query Log, and the General Query Log. In 5.1 you also use the INFORMATION_SCHEMA.PROCESSLIST.

Anyway, Joe mentioned he does a strings on tcpdump to extract the queries, and there was no need to restart the server (this point interested me). So, not letting a challenge go, having never used tcpdump.

Well, here’s how.


tcpdump -w mysqldump.txt -i lo


NOTE: You must log output to file with -w to get the full packets and not just headers.

In a seperate session.


$ mysql -uroot -p mysql -h `hostname`
mysql> select * from user;
mysql> exit
# I did a ctrl-C in the other terminal (not sure if necessary)
$ strings tcpdump.txt
select * from user
mysql
user
user


NOTE: localhost wasn’t valid, it had to be the hostname of the server. Of course you could access the server from a different client.

Of course there may be other or better ways, but it worked for me and was rather cool.

Perhaps this is a good reason to use SSL?

Just to add some more features of the MySQL Migration Toolkit from the MySQL Conference presentation MySQL Migration Toolkit by Mike Zinner from MySQL AB.

You can extend and modify the funcionality of the Migration toolkit with the supplied Eclipse Java project. I’ll need to download the code to write some more detailed notes, but here were a few points from Mike.

Classes are in the com.mysql.grt.modules Package Space
The main configurable classes are nameed Migration????..java and ReverseEngineer???.java with ???? being for the different Database Products

Within the Eclipse project, you can incoporate other languages. For example, ReveserEngineerMySQL Jdbc.java for example has a callGrtFunction to code written in C. This I’m assuming will allow you to incoporate all the other languages of the GRT such as Python, Lua. (I’m still impressed you can actually do this, a mini project for another day to pull this apart.

A question from the audience was about Oracle User Defined data types. MigrationOracle.java for example can easily be extended to cater for the migration of user defined data types to a suitable valid MySQL alternative.

References
MySQL Migration Toolkit – Provides details, screenshots and Flash Tutorials for SQL Server, Oracle and Access Migrations.