MySQL Replibeertion

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MySQL Replibeertion was the last scheduled session on Day 2, but not withstanding there was free beer (a lot of), there was a serious side with a Replication Discussion.

One of the first questions by Jeremy was “Are the any big replication users?” to which Sheeri quickly replied “Are you calling me fat again”.

This was a highly interactive session, here are some of the points from the audience.

Some Uses of Replication

  • Backup
  • Hot standby
  • Scaling
  • Data Warehousing
    • Slaves are larger then your database
  • For no special reason
  • Consolidation of multiple sources
  • Support for multiple indexes

Issues

  • Can break
  • replication lag
  • bi-directional replication is not supported
  • hard to setup replication/initialization upto point to run one command
  • hard to know when the slave is out of sync (working but broken) diagnose
  • does not manage binary logs for you (max-bin-logs )
  • no row level replication (5.1 row based replication, change based replication, good and bad )
  • Serialized execution on the slave
  • Master does not keep track of the slaves (to the master, the slave is just another connection) Jeremy comment “it really really sucks in production systems.”
  • No multi-master replication. A slave can not have more then one master.
  • ring replication. No idea when something breaks what is right.
  • no ability for delayed duplication.
  • no way to get binlogs back. (manually twink the info file)
  • Master doesn’t care what data is on the slave.
  • A replication backup is really only good for the restoration of that machine
  • Default reconnection timeout is way, way to high (default of 1 minute). It should be at most 1 second with exponential fallback. (master-connect-retry), no fallback, no max number of retries, logged in error log every time.

Feature Results (Things replication needs, what you want to see)

  • Delayed Replication
  • Registered Salves in the Master
  • Import Binlog
  • Checksum Table Events (Need ability for table checksum to be added to binlog periodically so it can be checked by the slave.)
  • Global Sequence Number
  • Connect Retry Exponential Backoff
  • Hetrogous Replication (Oracle to MySQL). Golden Gate Software has a commercial offering
  • Command Exclusion List (sql_log_bin=0)
  • Replication filters by data on the slave
  • Show upcoming queries, skip query
  • Multi-Master to one slave
  • piping mysqlbin log commands into the mysql client fails for some character sets.
  • Binlog index capability
  • Checksum of Binary Events to determine a command is valid
  • command line interface in mysqllog so you could go backwards and forwards, then execute commands.

Check out more at Google Code Blog.

Day 2 – Memorable Quotes

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Continuing on from my Day 1 – Memorable Quotes from the MySQL Camp.

“Are there any big replication users” — Jeremy “Are you calling me fat again” — Sheeri

“Only some of us have problems with interruptions.” — Jeremy to Jay

“It really really sucks in production systems.” — Jeremy About Slave management by Master.

“So there are like 12 people here, it must be the CEO’s turn to talk.” — Marten Mickos MySQL CEO

“Kegs and Eggs” — Joel S. Regarding all beer that will still be available at breakfast tomorrow.

“You can fight to the death for it”, Jeremy to his two employees Joel and Justin about who gets to be called employee #1.

“Patches go to employee #1″ — Ronald directed to Joel when a replication patch was coined by Jeremy and Eric.

“It’s a little like Google, there are no numbers”. In response to getting any dates/times on a commitment to functionality by MySQL.

“There is a way, but you don’t want to do it.” — Monty on a topic in using Replication Slave for Master Backups

“The Blackhole storage engine is really really scary. It’s not just the name, it’s a hack.” — Jeremy

“It will suck you in.” — More on the Blackhole Storage Engine.

“It still scares me.” — Jeremy are a long discussion by Brian on the Blackhole architecture concluding with the transactional state.

“I’m not sure I’d buy that.” — Brian continuing on more comments about the blackhole discussion.

“Let’s not optimize things that won’t happen in the grand scheme of things” — Jeremy

“You asked what I wanted to see, not what was practical” — Sheeri

“Wasting network bandwidth is great” — Jeremy

“People do lots of weird things to do performance”.

“All you need is beer and love”.

“Oh” — Sheeri. Long pause. “Light bulb pops up” — Jeremy

“Are we eating Oracle’s lunch? No we are eating Oracle’s dessert” — Marten Mikos MySQL CEO

MySQL Winter of Code

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Our first session in Day 2 of the MySQL Camp was the MySQL Winter of Code, as well as an overview of the QA Pilot program and Overview of the Community Doxygen Project by Kaj Arnö and Jay Pipes.

Starting with discussions on Code Contributions & MySQL Winter of Code

Quality Contributer Program

  • More coding happens during wintertime then in summer
  • MySQL has less contributions than many other Open Source projects
  • Contributor License Agreement
    • We want to award contribution more then nominally
    • We want to encourage contributions in all areas
    • We prefer contributions in certain areas (especially encourage them)

Requirements for Winter of Code

  • A signed Contributor License Agreement
  • A well-formed proposal
  • Votes from the Community and/or MySQL

Topics for Winter of Code 2007

  • Connectors
    • Improvements in (pure drivers for) Perl, Apache APR, Python, Ruby
  • Storage Engines
    • File System Storage Engine
      • select directory,filename,size from files where size > 1000000;
      • select directory,sum(size) from files group by directory;
    • JPG/EXIF Storage Engine
      • update jpgfiles SET Author = ‘name';
  • Anything
    • Full Text Search for CJK
    • MySQL GIS improvements
    • Your Idea

Which versions does it go to?

  • MySQL 5.1 Community Server
  • MySQL 5.2 Enterprise Server

MySQL Quality Contributor Program

  • Searching for Quality Contributors
    • Bug Reports
    • Test Cases
    • Bug Patches
  • Defining a Quality Contributor
  • Encouraging Quality Contributors
    • Fixing Bugs
    • Responsiveness and feedback
    • Recognition and attribution
    • Privileges/Awards

Day 1 – Memorable Quotes

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Plenty of people are writing highly technical stuff from MySQL Camp including your’s truly. However there needs to be a lighter side here, and well this is it, Memorable Quotes.

“That’s moderately easy to difficult.” Brian Aker talking about table_funcs in A MySQL Core Kernel

“That’s Trivial, it’s less then a day’s work”, Monty, also in “A MySQL Core Kernel”, of course Monty said “It’s Trivial” several times, and that’s fine, it probably is trivial and is a day’s work for the guru’s, the problem is there are presently 6,000 trivial day’s work on the list of things to do.

“I’m trying to estimate when my finger will fall off.” — Jay Pipes You had to be there. I will say no more.

“You work for InnoDB, right” — Dathan Vance Pattishall of Flickr “InnoDB works for me.” — Ken Jacobs of Oracle

“Absolutely” Steve Gunn of Google in “The MySQL at The Google” talk. And the question from the floor that prompted this response “Do schema changes ever affect the production systems”.

“Everything at Google grows at the rate Google grows. If you want a proper answer we have to file that with the SEC”. Steve Gunn of Google again in “The MySQL at The Google”.

“We like to use boxes that crash.” — Mark Callaghan of Google.

“I want to make it, but we have already met before.” — Paul Tuckfield while Jeremy bashing. Side Note, apparently I’ve been saying “bagging Jeremy” which is Aussie Slang, but here in the US it has other meanings!

“I’d love my business card to say Hacker Herder”. The very cool Leslie, our Google Liason person.

“Actually they are just extras, they have all been hired for the day.” — Sheeri. In reference to all the Google Employees wearing Google shirts.

“And we’ll give you a tee-shirt” — An Google employee about Job Opportunities.

“I’m going have to kill Jeremy. This wireless stinks, I’d rather have dialup” — Sheeri about our hotel connectivity, hotel being recommended by Jeremy.

“I’m the former founder of Live Journal.” — Brad Fitzpatrick. “How can you be a former founder” — Jeremy Cole.

There were of course so many more, I just didn’t write them down. But tomorrow I will be prepared.

Testing on the toilet

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Yes you got it, even while in the restroom here at Google (you can’t say toilets here in the US, because that’s the device), Google keeps you occupied while standing or sitting with the writings of “Testing on the Toilet”.

In Episode 19, TOTT talks about “Converting Old Style Tests”. An interesting read, rather then the daily grind of the front page of USA Today, plus as well as something that can be obviously changed at a longer frequency.

So how was the toilet experience here at MySQL Camp. Well you have toilet warming seats , my first experience, it was a little weird, and then you get the builtin “bidet” as well, with the ability for front cleaning, rear cleaning and then drying. Now that was really weird.

There has been a policy of what photos we can and can’t take and that’s cool, so I can’t post a copy of it. I will however show you this cool testing logo of TOTT as it was also on a tee-shirt (yes, it’s a little stained, but geeks do that sometimes) of a Google employee in Kiev, which is where we can take photos.

MySQL Camp – Introductions & Comments

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The great thing about this unconference, is the lack of total formal structure. For now , our first session we are having an open introduction of people, there are at good 60+ people here already, and people rolling in, and it’s great to hear people’s background, and also to bag Jeremy Cole at every opportunity. We have a variety of people from various backgrounds, companies and experience levels.

We are in the Kiev room, with power build into the desks, lots of desk space and full 360% swivel chairs. This is just another example of the company’s clear thinking about it’s requirements.

There have already been some very funny stories, I should have made more earlier notes. Here are some.

Adam Ritter (Proven Scaling ride winner) was the first to bag Oracle, really bold move with Ken Jacobs from Oracle directly behind him, and he had already made his introduction.

Paul Tuckfield of You Tube guys said to Jeremy Cole re his replication talk “I want to make it, but we have already met before.” There have been about 10 bags of Jeremy already, he is giving as good as he is getting. Proven Scaling are sponsoring Beer session tomorrow night. Great stuff Jeremy. He did also ask how many people were planning on coming, given the number of people at the MySQL Camp has tripled in the past few days.

Breaking news. Mark Callaghan from Google, “Is there anybody from You Tube here”, to which the Paul Tuckfield of You Tube identified himself. After a few quick words the Google comment was “Deals Off” which made everybody laugh. That’s been level of good interaction with people. here

Flickr DB dude (his words) Dathan Vance Pattishall said to Ken Jacobs “You work for InnoDB, right”. Ken Jacobs response was “InnoDB works for me.”. Again a lot of laughs.

Google update – another 2 mins later

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I’m outside enjoying a very lovely Danish and Orange juice with Jay and Leslie, and like 3 motorised scooters and a guy on a skateboard goes past. Did I mention how cool this place is!

Back in the foyer and Sheeri is sitting in the leather massage chair, as more people start streaming in. She has her laptop there and is IM’ing her boyfriend.

“So I’m in a massage chair at Google head quarters”. And his response is , “like right now”. Well here will be the photo and video when we find somebody with a card reader for my camera.

Jay’s looking a little worried, registrations are now over 200, 202, yesterday is was 150, and like 3 days ago, still in the 70s & 80s. People must have found out a free event at MySQL. We are going to kick people out that don’t contribute. It is a unconference.

So now that I write this, registrations are at 206.

My own Googlewear

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So like two minutes later, some official looking Google people come over and saw “Come on over and get your Google Shirt”. So before the last past is even cold, we have our own Googlewear.

A minute later, Leslie is back again saying, guys and lady (Just for Sheeri), “Contintental breakfast is ready in the room”. Now to check out the Google Food!

Googlewear

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Everybody here (that is not us visitors) are wearing Google shirts. It must be an official clothing label.

So Sheeri says “Actually they are just extras, they have been hired for the day.”

So the latest quote from Leslie is “Eat, joy and be merry, and stay inside the blue lines”. Of course I should also mention when we arrived the parking security guy said. “Follow the second yellow brick road”. This is going to be a weekend just of quotes!

I'm at Google Mountain View

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We have made it to MySQL Camp being held at Google Head Quarters in Mountain View California. Directions WOOT!!!

So we are at the lobby reception of Building 40, and I’m lounging back in a large green beanbag behind all the name tags, this is so cool, the problem is with all our technology, nobody yet has the capability to read the photos from a digital camera so I can upload it. Both Sheeri and myself have left the right stuff in our hotel room. So stay tuned.

Leslie our Google co-coordinator wants her business card to read “Hacker Herder” which sounds so cool. This whole weekend is going to be a blast. More to come.

MySQL Quotes

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Frank was on a role with MySQL quotes (it’s 1am here in New York – All that Red Bull & Vodka). Here are some of them:

Let me scale you!

Wanna scale.

Scale me Baby!

Backup Now!

MySQL – DBA Friendly.

MySQL – Use the Attitude.

MySQL. Be Bold!

MySQL. Look Again

MySQL – Coming to a website near you.

One small step for Data, one giant leap for DBA.

Data, we are serious about it.

My Job, My Passion. MySQL.

MySQL. Never Doubt.

MySQL. Scaling made Easy.

MySQL. Scaling all you want.

Got MySQL!

Do it with MySQL.

Scale Yourself.

MySQL or die.

I’ve also done some of my own shirts designs (see small images below), a number I already have on shirts (you can check them out on me at MySQL Camp).

Some other references include MySQL forge Merchandise and Arjen’s suggestions.


UltimateLAMP Passwords

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For those passwords I have not clearly mentioned within the included wiki documents, here is a summary.

  • UltimateLAMP is built on the VMWare Browser Appliance application, so all Linux passwords match the supplied default.
    • vmware/vwmare
    • root/vmware To use, you do $ sudo su –
  • For all UltimateLAMP passwords, I have used dolphin. Within MySQL, the username will match the database name of the application.
  • For all UltimateLAMP Applications, I have used a username that matches the product name (where possible), and have used the password dolphin. Some applications for example, have a default user (for example WordPress uses admin).

A summary introduction to Agile

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Agile Development Methodology: – Most popular Implementations: Extreme Programming (XP), SCRUM, Crystal

Links

Books Highly Recommended

Extreme Programming Explained Extreme Programming Pocket Book More books on my Library page.

Linux One Liner – dirtree alternative

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Linux has a cool command called dirtree that gives a more visual representation of your directory structure. If you have the misfortune of working on a Unix variant that doesn’t have it, checkout this cool one liner.

ls -R . | grep ":$" | sed -e 's/:$//' -e 's/[^-][^/]*\//--/g' -e 's/^/   /' -e 's/-/|/'

Thanks for the command Tom.

Log Buffer #13: a Carnival of the Vanities for DBAs

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Unlike fellow author Giuseppe of last week’s Log Buffer #12 I volunteered for the job of this week’s Log Buffer. Lots to say, so little time, so lets get started with Log Buffer #13.

Tom Kyte has been at the DBForum 2006 in Denmark. Apart from the contents of the Forum, his picture and comment “I spied some artifacts from Mogens Oracle Museum, a copy of the Version 3 and Version 4 Oracle” in Dbforum 2006, in the past… was an impressive look back in time. Manuals, what are they? So how old is this? Wikipedia History places Oracle Version 4 at 1984, some 22 years ago. One of the comments to Tom’s entry takes us to Back to the future (Oracle 4.1 VM appliance). The title gives the article’s content away, but worth a view of Oracle history. Good to also see Tom won the 42 Question Quiz on day 1, but what was the question he got wrong?

Ric Smith gives us a window of this month’s upcoming Oracle Open World with some details of Oracle Open World 2006 – Oracle Develop, “a new event tailored for the “geek” in us all. The format will make for a more developer-oriented conference”. Craig Mullins is at the European International DB2 User Group conference being held in Vienna this week (must be the month for RDBMS conferences). Details of his presentation “Change Control for DB2 Access Paths” are at IDUG in Vienna.

Build Your Own Oracle RAC Cluster on Linux – Again references a very detailed article and explanation by Jeffrey Hunter on RAC and shows the benefit by contributions to the OTN Oracle Community. If you’re heading to Oracle Open World this month, Justin Kestelyn mentions details of a similar presentation being held during the “Oracle on Linux Experience” portion of OTN Night on Monday Oct 23.

David Aldridge in his article Linux 2.6 Kernel I/O Schedulers for Oracle Data Warehousing: Part II has received some good responses in his concise and simple Benchmark. I always strive for simplicity in solving problems and this looks like a good simple approach to graphing I/O.

A little off the beaten track is Applying Web 2.0 to the Enterprise by Jonathan Bruce. The reason why I mention this is two fold. Firstly, decisions made by Project Management can have a big effect on the software development process, and this can have a significant effect on the DBAs and System Administrators that support systems. The article also mentions Agile Software Development of which I am a strong proponent. As I have a very detailed database background I’m also wary of some of the “strenghts” mentioned generally with Agile. A topic I’m happy to discuss more at some time.

E A D G B E. I have no idea what that means, you will need to read Ian Thain’s article regarding the Sybase WorkSpace to find out. He publishes some healthy performance improvement throughput figures with his 3 tuning guidelines.

Firebird 2.00 Release Candidate 5 has also been released this week. The news article indicates that this will probably become the release version.

Peter Scott reminds us that with all the technology advances and an existing 8 year old system which includes documentation, things still happen in I hate on call.

Greg Sabino Mullane over at Planet PostgreSQL is keeping abreast of the various open source offerings with his report on Berkeley DB now does MVCC. His comment “Looks like Oracle is actually doing something with their purchase …. Curiously, this comes right at the point when MySQL is dropping the BDB engine from their product.”. Hmmm, interesting observation, however it wasn’t the actual reason why BDB was dropped from MySQL. The actual reason mentioned some time ago can be found at BDB Engine removal.

Are we working in a booming industry? “Overall, Gartner is predicting that the worldwide DBMS market is around $14 billion and will continue to grow by nearly 7% per year”. This comment by Zack Urlocker is from his attendance of the “Gartner Open Source Summit - a very thorough analysis of the impact of open source technology in the database market.” You can read all his comments of the summit in Gartner Mastermind panel and Gartner on Open Source Databases.

Exploring the secrets of intermediate materialization by Adam Machanic revives a trick he had in SQL Server 2000 in improving logical reads when query tuning. This example shows it’s operation in SQL Server 2005.

Peter Zaitsev gives us a quick refresher on his MySQL Performance Blog with What to tune in MySQL Server after installation. A good introduction reference of configurable system variables, particularly for those non-MySQL DBA’s that need to also support a MySQL installation. Mike Kruckenberg also gives us a valuable consolidated reference in his twin articles, Guide to Incompatibilities when Upgrading MySQL to Version 4.1 and Guide to Incompatibilities when Upgrading MySQL to Version 5.0. Essential reading for clearly understanding MySQL database upgrades and possible traps.

MySQL Tools for Microsoft Visual Studio 1.0.1 beta has been released. Enough said. Ok, well for those that want some more detail, I quote from Reggie Burnett – a downloadable plug-in for Visual Studio 2005 that allows Windows developers to quickly build MySQL data-driven applications with Visual Studio. With this plug-in, developers will be able to create, modify and manage MySQL database objects with an easy-to-use interface from within the Visual Studio IDE.. If only I used Microsoft I could check it out!

Daniel Schneller highlights one of the problems in a large scale out MySQL implementation in his article MySQL replication timeout trap. Valuable information in a network infrastructure to ensure your slaves are performing optimally.

Normally I’d summarise a worthy article for review, this time I’ve reproduced the concise summary by Jason Gaylord in Preventing SQL Injection Attacks which explains his content. Scott Guthrie just posted some really good stuff about preventing SQL injection attacks. In his blog post he talks about an application that Michael Sutton created to check SQL injection attacks by screening Google search and looking for sites with QueryString, etc. Check out his post for more details: http://weblogs.asp.net/scottgu/archive/2006/09/30/tip_2f00_trick_3a00_-guard-against-sql-injection-attacks.aspx

Of the big 5 or 6 RDBMS products of the past 2 decades, DB2 is the only one that hasn’t crossed my path in some way. Willie Favero writes What’s in a name – The saga continues…, sharing his views on the official name of DB2® Version 9 for z/OS.

Jeremy Cole has been busy in recent months with his new found freedoms in his new venture Proven Scaling. He has released another MySQL Source Patch with On Triggers, Stored Procedures, and Call Stacks. Keep em comin’ Jeremy. And just as I complete this weeks Log Buffer, good mate Jay (the plumber) Pipes has published HOWTO: Making a Corresponding Test Case for your Patch. Very worthy information for all those past, present and future patch writers.

The Data Charmer Giuseppe Maxia gives us the inside goss on his recent vacation interests in Take the MySQL Certification in five steps. Good Advice, I liked Point 5, and the unofficial Point 6. Marcus Popp also points us to New Lists of Certified Candidates online so you can see your name in lights. Reminds me to stop procrastinating and to take the MySQL 5 exams myself. It’s been on the cards for a few months now.

We end this week with one of those feel good stories of something that inspires me. Paul McCullagh has written his own MySQL transactional storage engine. PBXT beta 0.97 has just been released as a Pluggable storage engine for MySQL 5.1. Quoting Paul “PBXT is the first full featured engine to be released in this form.”. This leverages a new feature in the upcoming MySQL 5.1 GA release where developers can use MySQL’s extensible Storage Engine Architecture as a plugin without the need for recompiling with MySQL source. Look out for a lot more opportunities in storing and access different types of data in the future with this feature. [Author Side Note: Compiling MySQL from the latest BK tree may contain code features that are not fully tested (e.g. 2 Oct 2006). It’s best when integrating other patches or plugins to use a known MySQL Source Snapshots, otherwise things may break!]

And with a certain amount of deja vu from last week’s closing Log Buffer #12 comment by Giuseppe, your’s truly will also be joining MySQL. Checkout my If you can’t beat them, join them.

That’s all for lucky #13. Thanks for the opportunity Dave.

If you can't beat them, join them!

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Like fellow friends and MySQL’ers before me Morgan, Roland, Giuseppe, Markus and Sean, I’ve joined the MySQL juggernaut on the ride of my life, achieving two of my short/medium term professional goals in one step. Woot!

It says something to me about the company I’m very excited to work for when I knew of all these people before they joined MySQL this year (2006). I’ll also be joining other friends and MySQL people Arjen, Jon, Jay, Colin, Michael Z and I still have a list of friends that I’ve met while being part of the MySQL community.

And as Giuseppe said I’ll be working in a virtual company. Another article I like to tell others about MySQL is MySQL: Workers in 25 countries with no HQ.

I’ll leave you with the MySQL Values from the Company About MySQL AB page.

We want the MySQL server to be:

  • The best and the most used database in the world
  • Available and affordable for all
  • Easy to use
  • Continuously improved while remaining fast and safe
  • Fun to use and improve
  • Free from bugs

MySQL AB and the people of MySQL AB:

  • Subscribe to the Open Source philosophy
  • Aim to be good citizens
  • Prefer partners that share our values and mindset
  • Answer email and give support
  • Are a virtual company, networking with others

Tutorial – Beginner Web Services

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An introduction to using Axis.

What is Axis?

Axis is essentially a SOAP engine — a framework for constructing SOAP processors such as clients, servers, gateways, etc. The current version of Axis is written in Java. But Axis isn’t just a SOAP engine — it also includes:

  • a simple stand-alone server,
  • a server which plugs into servlet engines such as Tomcat,
  • extensive support for the Web Service Description Language (WSDL),
  • emitter tooling that generates Java classes from WSDL.
  • some sample programs, and
  • a tool for monitoring TCP/IP packets.

Pre-Requisites

Installation

su -
cd /opt
wget http://apache.ausgamers.com/ws/axis/1_4/axis-bin-1_4.tar.gz
tar xvfz axis-bin-1_4.tar.gz
ln -s axis-1_4/ axis
echo "AXIS_HOME=/opt/axis;export AXIS_HOME" > /etc/profile.d/axis.sh
. /etc/profile.d/axis.sh
cp -r $AXIS_HOME/webapps/axis $CATALINA_HOME/webapps
catalina.sh stop
catalina.sh start

At this time, you should be able to confirm this installation was initially successful by going to http://localhost:8080/axis/

Installed Axis Options

The default Axis page, gives you a number of options. To confirm the installation, select the Validate Axis Link http://localhost:8080/axis/happyaxis.jsp. If there is anything missing this page will report it. In my case I was missing XML Security, which is optional.

cd /tmp
wget http://xml.apache.org/security/dist/java-library/xml-security-bin-1_3_0.zip
unzip  xml-security-bin-1_3_0.zip
cp xml-security-1_3_0/libs/xmlsec-1.3.0.jar /opt/tomcat/common/lib
catalina.sh stop
catalina.sh start

One of the links from the default home page are http://localhost:8080/axis/servlet/AxisServlet which Lists services.

First Use

One of the nicest parts of AXIS is its “instant Web service” feature called Java Web Service (JWS) — just take a Java file, rename it, and drop it into TOMCAT_HOME/webapps/axis to make all of the (public) methods in the class callable through Web services.

Quote.java

import java.util.HashMap;
import java.util.Map;

public class Quote {
  private HashMap quotes = null;
  public Quote() {
    quotes = new HashMap();
    quotes.put("Groucho Marx", "Time flies like an arrow.  Fruit flies like a banana.");
    quotes.put("Mae West", "When women go wrong, men go right after them.");
    quotes.put("Mark Twain", "Go to Heaven for the climate, Hell for the company.");
    quotes.put("Thomas Edison", "Genius is 1% inspiration, 99% perspiration.");
  }
  public String quote(String name) {
    String quote;
    if (name == null || name.length() == 0
      || (quote = (String) quotes.get(name)) == null) {
      quote = "No quotes.";
  }
  return (quote);
  }
  public int count() {
    return quotes.size();
  }
}

cp Quote.java /opt/tomcat/webapps/axis/Quote.jws

http://localhost:8080/axis/Quote.jws
http://localhost:8080/axis/Quote.jws?wsdl

More details can be found at Getting Started using Web Services with Tomcat and Axis.

What’s Next

In my next Tutorial, I’ll be moving to the practical use of Web Services using WSDL.

References

When is a batch job successful?

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Simple enough question, and it’s a simple enough answer. When the batch job/process in question successfully completes what it is designed to do and not in error.

I’m attempting to test, integrate and document some developed code on a client site, and well, I’m disgusted. (as with most things, is an accumulation of a number of things that lead to these frustrations.)

The process is broken down into two parts, lets call these X and Y. Now Y is the most stable part of a long standing product, it’s the API calls to the database. X does some pre-processing, then calls Y, then reports back success/failure.

Simple enough, and these are batch processes run after hours, so operators that don’t have the business knowledge need to know success or failure.

I’ll set aside for the moment that the calling process (which is indeed a shell script wrapper around the Java code) returns a status 0-Success and 1-Failure. This is practically useless because even when X fails, it doesn’t necessary report that (another story, but part of the same frustration)

I’ve extracted a small portion of the XML response that is returned from Y, that is then inteperated by X.

...
 <Status>
  <Code>0</Code>
  <Description>Success</Description>
  <DateTime>2006-09-26T16:03:45</DateTime>
 </Status>
 <Result>
   <OutputFileName>Not.Real.Name.Output.txt</OutputFileName>
 </Result>
...

...
<Severity>
  <Code>FATAL</Code>
    <Description>A fatal error was encountered while processing. See the reason code and description for further details.</Description>
</Severity>
<Reason>
 <Code>50</Code>
 <Description>XML exception: XML parse error on line: 9, position: ....
</Reason>
...

I’m not being told, “Oh, that’s a problem”. I’m been attempted to be convinced that it’s not an error, it is success.

Well, I don’t know from what planet you have lobbed in from, but in by book, FATAL is FATAL. Check out Handling Error Levels in Logging.

What’s the most depressing is I’m expected to hand this over to the customer for testing. My job isn’t actually testing, it’s integration and documentation for the end user, but the level of quality has demanded that I test it onsite before passing on. Well, I’m not going to give this to the customer, which makes it hard when the developers (who are on the same team as me) don’t see this as a problem.

PS: The list of articles of this nature has grown to the point, I’ve created my own “The Daily WFT” category. I’ve had a lot of stories I’ve never written about, perhaps I’ll pen a few more now.

Transforming XML with XSLT

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I’ve done some work previously in XSLT to nicely format XML output within a browser.

Presently, some code I’m working with also does this transforming of an XML output via XSLT into a HTML file. I wanted to modify the XSLT, but found I’d made an error, so without having to pre-configure data and run the process every time every time in a more timeconsuming iterative debugging approach, I was able to do the following manually.

Having an XML file called example.xml and an XSLT file called example.xslt, by adding the second line below manually to the XML file I was able to then render the XML file in a Browser, which then reported the error enabling me to easily correct.


<?xml version="1.0" encoding="UTF-8"?>
<?xml-stylesheet type="text/xsl" href="example.xslt"?>
...

It would have been nice if the browser could accept this for the XML file without the need to manually modify it. There probably is a better way, or a more specify XML GUI tool, but the time to find this out, maybe next time.

Here is a Beginner XSLT reference.

Google – Is both friend and foe

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This is an interesting article How Google can make – or break – your company. The plight of a small business that overnight lost it’s high free search results and in the coming months say a 20% drop in sales.

The official response “Just as the web changes constantly, Google continues to modify and refine our algorithms to improve the quality of our objective search results.”

The comment made by the small business “It’s like owning a shop on a busy street corner where all the pedestrians suddenly and mysteriously vanish.” That’s gotto hurt.

The article also delves into a lot more, an interesting read.

Asian Air Show 2006 featuring the Airbus A380

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While in Singapore earlier in the Year (Yes, I’m very slack with these photos), I got up close and personal with the new Airbus A380. I wasn’t that lucky to get inside, I think that was reserved for airline flight crews, but still there are a few photos.

I’ve had some media problems with both DVD’s containing photos of my Singapore/Thailand/Malaysia trip, but you can view a few Here on my Flickr.



Updated
7 Nov 2006 Airbus recently announced it’s third major delay, and today FedEx cancelled it’s order. Read more amount the details, and airline orders at Wikipedia.

Google Earth

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Google Earth and Google Maps can give you some great views of our planet. Here is a full-time blog just for Google Earth.

There’s plenty of amazing things to see, check out Top Ten Coolest Things seen with Google Earth. The list includes:

  • Capsized Cruise Ship Captured in Google Earth / Maps
  • KC-135 Caught Refueling C-5 Galaxy in Mid-Air in Google Earth!
  • Huge Scale Model of Disputed Border Region of China Found in Google Earth
  • Lancaster Bomber Caught Flying in Google Earth
  • Flying Car? Not Really
  • Nude Sunbather caught by google earth.
  • Firefox Crop Circle in Google Earth
  • Google Earth Las Vegas
  • Shipwrecks Around the Google Earth
  • See African Animals in High Resolution in Google Earth

Not to be outdone, check out the Google 3D Warehouse for images like Golden Gate Bridge.

Here are a few more cool things I’ve seen. Hole, More about the hole

Plane Spotting without leaving your desk

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I’ve heard of people that go plane spotting. Watching different planes that come into airports.

I’m lazy, while checking out my home with Wikimapia look what I spotted Here. (Offline image: View)

So for all those plane spotters. What is it? My guess would be an Boeing 737, probably a 737-800.

Speaking of Plane Spotting, I’ve been meaning of putting up my photos of the recent Asian Air Show in Singapore and my up close and personal photos of the Airbus A380.

Arrrrrgggggggggggghhhhhhhhhhhhhhhh! I’ve tried to retrieve my photos from DVD and I’m getting an cp: reading `/media/photos2006/photos/2006/2006_02_23_AirShow/IMG_5939.JPG': Input/output error Error.

Well so much for those photos of Singapore, Bangkok and Malaysia from earlier in the year.
That’s gotta ruin your Sunday.

PS: How did I know what plane it was. Hint: the color gives it away.

PPS: Updated Jan 12 2007. Interesting that the present live view no longer has the plane. My Offline View has it. Good to know that this little area of Brisbane has been updated on Google Maps.

The price for digg success

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I guess much like the Slashdot effect, the Digg effect is both a good thing for your exposure and traffic hits, and a bad thing for those ISP’s watching the traffic. (See Jay’s Slashdot Fame).

In the past week, I’ve gone to a number of digg article sites and they have been unavailable. I never kept details of these IT articles, but here is one the one article not of an IT I look at that I did. It referred to an image, which the host provider adjusted (see image to the right). The host provider was ImageShack. I didn’t read anything in the T & C about being too popular!

Here’s the original Digg Post Gmail ads get a little too personal.

Seems I’m not the only person wanting to see it, I found in the comments a repost of the image Here. Just for future reference my copy is Here

Planet kicked out of solar system after failing test

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PLUTO supporters from all over the world are burning things after the tiny cold planet was booted out of the solar system.

The decision caused uproar in the text book and hanging mobile industries, which will have to recall all their products and re-do them,

The disney company announced it would rename its famous cartoon dog.

Trivia questions, already at calamity points, will need to be rewritten and planetariums are busy papering over their Pluto exhibits, retraining guides and cutting the ends off posters.

From City News Issue 153 31 August 06




Larger Image

Logical Data Modelling (LDM)

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Following my User Group Presentation I was asked by fellow MySQLer Kim about Logical Data Modelling (LDM), in relation to Physical Data Modelling.

Well, first the brain had to work overtime to remember when was the last time I worked on a Logical Data Model. The answer to that is 1996 doing R&D work for Oracle Corporation with their CASE repository tool, Oracle Designer, about version 1.3/1.3.2. I’ve learnt in the past 10 years to purge technical stuff from my brain, leading from the capacity in be able to remember in detail data models, data migration and data cleansing issues of projects even after leaving them 3 years eariler.

As Kim pointed out, he thinks physically, actually directly at the SQL level, then working backwards to produce an appropiate physical model. To think logically is to consider the entities and attributes and relations before considering the physical tables, columns and relationships. So how do you program somebody to think logically? In the case with Kim, he is undertaking formal studies after already grasping the concepts of software development. Generally today more people don’t undertake the formal education and we end up with The Hobbist and the Professional Syndrome.

I guess in summary I’d argue why bother. Does anybody still do traditional logical models? Feedback/comments are welcome. (Professionally I believe there is a place for LDM).
However for the purpose of the exercise lets start with a Physical Representation and present a Logical Representation of that to see the differences.



From this you can see a classic Library example, showing a table of Books and a Table of Authors, and an intersection table (3NF) to indicate that a Book can have one to many Authors, and likewise an Author can have one to many Books.

So how would this have been represented in a Logical Model.



Some things to consider in Logical Modelling.

  • Attributes really only require a name, and perhaps just a datatype using number, string, date (Jim Starkey would be happy), but nothing specific like SMALLINT, or VARCHAR(50).
  • An Attributes Mandatory/Optional state may or may not be known
  • Information is not in 3NF. i.e. relationships can be many to many (in our example, there is no concept of the intersection table

I’m going from memory here, so there is probably more points to consider.

So how do you teach this when you are trying to work backwards, when I learnt this back in 1988 (some 18 years ago), I’d never created a database or used SQL so I didn’t have the history. Arjen had a brilliant idea to consider Logical Modelling after the fact. Views. Consider an end user requirement for Reporting, and how you would represent your model better to an end user (effectively de-normalising these views so users don’t have to know about joins).

In this case you would create a view of Books and a View of Authors. Details such as mandatory/optional isn’t important to the end user report (ie, it’s not like it’s needed to be enforced), and specific datatype details again are not that important. The basics to know how to format a number or a date works.

An interesting approach that worked well in our explaining.

The Text Book

So it was interesting to go back to the text book using C.J. Date’s An Introduction to Database Systems to review definitions.

Logically isn’t really referenced, the term used is conceptual. A conceptual definition is “The right way to do database design is to get the logical design right first, without paying any attention whatsoever at that stage to physical – that is, performance – considerations”

Also for example Third Normal Form we get from Section 12.3 First, Second and Third Normal Forms.

Third normal form (very informal definition): A relvar is in 3NF if and only if the monkey attributes (if any) are both:

  • a. Mutually independent
  • b. Irreducibly dependent on the primary key

We explain the terms nonkey attribute and mutually independend (loosely) as follows:

  • A nonkey attribute is any attribute that does not participate in the primary key of the relvar concerned.
  • Two or more attributes are mutually independent if none of them is functionally dependent on any combination of the others. Such independence implies that each attributes can be updated independently of the rest.

Man, no wonder many years of experience and having generally seen most cases, enables me to forget this and not feel like I’ve fogotten something.

The Hobbyist and the Professional

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I first coined this term in February 2006 in a paper titled “Overcoming the Challenges of Establishing Service and Support Channels” for the conference “Implementing Open Source for Optimal Business Performance” View Paper.

I must have referenced this several times, time to give this topic it’s due notice. In summary it targets three areas:

  • the lack of appropriate database design in open source projects
  • the lack of coding standards
  • the lack of sound programming principles

Here are the bullet points from the slide in a presentation.

Hobbyist

  • Download-able software and examples
  • Online tutorials
  • Books like Learn in 24 hours/For Dummies

Professional

  • Formal Qualifications
  • Grounding in sound programming practices
  • Understanding of SDLC principles
  • Worked in team environment

Middle Ground Developer

  • Time to skill verses output productivity
  • Depends on environment and requirements