Several things to think about in the next 10 days leading up to Kaleidoscope.

1. The Marriott Wardman Park is out of rooms. If you’re attending and haven’t reserved a room yet, you may get lucky with a cancellation, but there are several hotels on the Metro line that should have openings. The conference and location is very popular, and while I wish we could accommodate everyone, it’s not going to be possible. Here’s a good suggestion: when next year’s conference dates and location are announced, register and reserve your room as soon as possible (hint – these announcements will be made at our general session on Monday, June 28 starting at 8:30 AM).

2. The Java Bus is coming! Monday afternoon/evening, June 28, the Java “Code to …

From time to time dialogs need some usability refactoring. So happened with the good old Copy table dialog in HeidiSQL. New features:
- Select specific indexes or foreign keys to be created in the new table
- An editor for a WHERE clause, for cases in which you only need a subset of the original row data in the target table
- A menu for recently used WHERE clauses, so you don't need to keep them all in mind
- Prompts for overwriting if the new table exists



Thanks to Daniel for ideas and feature request number 2,000.

In case you haven't figured it out, I'm a fan of Guy Kawasaki and his "How to Change the World " blog.  If you like his blog, you should check out his book "Reality Check."  Yes, you can read most of the content for free on the web, but sometimes a printed copy is more convenient.   Like if you're on an airplane.  Or on the toilet.  Or if you want to underline it.  Or if you want to underline it while you're on the toilet on an airplane.  Ok, you get the idea. 

The book covers some of the best items from his blog, categorized into themes like starting a company, raising money, business planning, innovation, marketing, schmoozing, management, hiring and firing and more. It's not a bunch of high-falutin' theories either. It's hard …

Today I received notice that next week’s Velocity conference is at maximum capacity. With just under 2 weeks before the start of ODTUG Kaleidoscope in Washington DC we still have room for late registrations. There is 4 days of MySQL content, free events and also a Sunday Symposium that includes talks on performance and high availability.

Contact any of the MySQL speakers directly and you can receive a special 50% discount code. This is only for MySQL attendees.

If you live in the DC area and only want the FREE option then come along and join use on Monday night for a free session and reception.

ODTUG Kaleidoscope 2010
July 27 – July 1
Marriott Wardman Part Hotel
2660 Woodley Road NW
Washington, District Of Columbia 20008
www.odtugkaleidoscope.com …

This post explains how to disable Arbitration when using MySQL Cluster. It gives a case where this could be useful.

First, a piece of advice: you do not want to run MySQL Cluster with arbitration disabled. But if you must, e.g. because of an oversight in your implementation, you can.
Arbitration is very important in MySQL Cluster. It makes sure you don't end up with a Split Brain situation: 2 halves working independently, continuing changing data, making it impossible for them to work together later on.

However, Arbitration comes with a price: you need an extra machine. "Sure, what's …

What makes you think jdbc autoreconnect is needed?
Application is idle for long periods at a time?
Wait_timeout too short?
Network failure or glitches?

Some good suggestions form Mark Matthews - Bug #5020

Having encountered the problem again myself today, trying to make jdbc for mysql reconnect any terminated connections using autoreconnect=true I figured out a way to work it out from the pooling side.


Introduction to the problem:

On the mysql side wait_timeout is set to default 8hrs and any connections idle for longer than that were beomg terminated despite setting the connection string to: url=jdbc:mysql://localhost:3306/dbname?autoReconnect=true. The application was thence throwing an exception.

The solution was to introduce a ping from the pooler which for “Ibatis”, the pooler technology used …

The need: Often there is a requirement where data in a particular table has to be processed, and the data processing might be slow, while the table might be a one that is used by your application extensively. For example, a logging table that logs page hits. Or there might be an archiving operation that has to be performed on a particular table. Archiving / processing / aggregating records, all these operations are slow and can really blog down a website, combine that with the added overhead if the table that needs to have these operations performed is one that...

This chapter starts as:

Chapter 4. Miscellaneous.

There are cases when wrong output is just symptom of wrong input made before.

For example, you start to receive wrong data at particular step of the
scenario. After analysis of the SELECT query (or queries) is clear what
queries are correct and return exactly same data which exists in the
table (or tables).

This means wrong data was inserted at the earlier step.

How to know when it happened?

Start from the step of the scenario which exists just before
step which does output, check every query as was described in earlier
chapters. If everything works correctly, examine earlier step, repeat
until you find the error.

I'm pleased to report that so far the Soccer World Cup has been pulled off rather successfully, with only minor incidents reported. I have however noticed local news showing some 'feel-good' stories that are obviously written to give a false impression to the international media of the real situation here. Let's hope the unions and Eskom workers don't mess things up by holding a gun to the Country's head with protesting/striking too much in the international media's light.. Hold thumbs..
BTW, I hate the vuvuzela :)

I thought I should share two important MySQL bugs with you today. In case you ever used YaSSL to establish …

Update (8/7/2012): After setting up a new OS X (Lion), I had installed MySQL via MacPorts and just moved my db files over to the case sensitive partition.  That works fine (been using it this way for a month).  With exception to the note below, I didn’t have to go through the trouble of moving the entire MySQL install.  So in my case,  I moved /opt/local/var/db/mysql5 to my other partition /Volumes/Macintosh HD 2/mysql5.  Then created a symbolic link pointing from the old to the new location.  That’s it.

Original (2010):
MySQL Workbench doesn’t play nice with case insensitive file systems when you try to use the db synchronization feature on schemas with mixed case table names.  …And the lower_case_table_names option in MySQL doesn’t quite fix it.

Ultimately, I decided to copy and move MySQL over to a …