I wrote yesterday that Christensen’s law of Conservation of Attractive Profits could be used to explain why open source vendors are increasingly turning to hybrid development and licensing strategies to generate revenue from open source.

Before I could think about doing so Arjen Lentz wrote a comment that did a lot of the explaining for me.

To recap, “The Law of Conservation of Attractive Profits”, articulated by Clayton Christensen in his book The Innovator’s Solution, states:

“When attractive profits disappear at one stage in the value chain because a product becomes modular and commoditized, the …

You might be wondering what's been happening with MySQL performance since Sun arrived on the scene. The good news is that we haven't been idle. There's been general recognition that MySQL could benefit from some performance and scalability enhancements, and Sun assembled a cross-organizational team immediately after the acquisition to get started on it. We've enjoyed excellent cooperation between the engineers from both organizations.

This kind of effort is not new for Sun - we've been working with proprietary database companies on performance for years, with source code for each of the major databases on site to help the process. In this case, the fact that the MySQL engineers are working for the same company certainly simplifies a lot of things.

If you'd like to get some insight into what's been happening, a video has just …

With Glassfish V3 and Netbeans 6.5, it is easy to move applications which run on Tomcat using Toplink/EclipseLink to Glassfish v3 Prelude.

The sample application contained in the zip file JPAWeb_TC6_Toplink-1.zip, is a simple web app using JSTL, Servlet, JSP and TopLink Essentials to store contact information into a MySQL database.

To Deploy and run the application on Tomcat, you need place a copy of the MySQL JDBC driver in $TOMCAT_HOME/lib and have a MySQL database which is accessible and that you have permissions to create tables in.

The application uses JNDI to access a Data Source defined on Tomcat (in our case via the context.xml). This requires you to use specify the Toplink property toplink.session.customizer in your persistence.xml indicating …

With Glassfish V3 and Netbeans 6.5, it is easy to move applications which run on Tomcat using Toplink/EclipseLink to Glassfish v3 Prelude.

The sample application contained in the zip file JPAWeb_TC6_Toplink-1.zip, is a simple web app using JSTL, Servlet, JSP and TopLink Essentials to store contact information into a MySQL database.

To Deploy and run the application on Tomcat, you need place a copy of the MySQL JDBC driver in $TOMCAT_HOME/lib and have a MySQL database which is accessible and that you have permissions to create tables in.

The application uses JNDI to access a Data Source defined on Tomcat (in our case via the context.xml). This requires you to use specify the Toplink property toplink.session.customizer in your persistence.xml indicating that …

With Glassfish V3 and Netbeans 6.5, it is easy to move applications which run on Tomcat using Toplink/EclipseLink to Glassfish v3 Prelude.

The sample application contained in the zip file JPAWeb_TC6_Toplink-1.zip, is a simple web app using JSTL, Servlet, JSP and TopLink Essentials to store contact information into a MySQL database.

To Deploy and run the application on Tomcat, you need place a copy of the MySQL JDBC driver in $TOMCAT_HOME/lib and have a MySQL database which is accessible and that you have permissions to create tables in.

The application uses JNDI to access a Data Source defined on Tomcat (in our case via the context.xml). This requires you to use specify the Toplink property toplink.session.customizer in your persistence.xml indicating that a SessionCustomizer will be used so that the lookup type on the JNDI …

The New Sun Microsystems  announced a new Glassfish/MySQL/OpenSolaris SPECjAppServer2004 result today. The  real highlight is that all software used in this benchmark is all Open Source Software. It is  a win for Open Source Software including Open Source Databases like PostgreSQL and MySQL. We need more of such benchmarks to highlight the exorbitant prices charged by Proprietary Database & other Software Vendors who charge and force customers to give them all their major dollars of their IT budget.

Tom Daly's blog entry highlight that in terms of Price/Performance, the proprietary database vendors who  conveniently also happen to be the …

Since before MySQL was MySQL, there has been the .FRM file. Of course, what it really wanted to be was “.form” -  a file that stored how to display a form on your (green) CRT. Jan blogged earlier in the year on this still being there, even in MySQL 5.1 (albeit not in any useful form).

So why do we want it to die?

Well… it’s not exactly very useful anymore.

There are a few things it’s used for….

If database/table.frm exists, the table exists (or, on Windows, you may also get database\table.frm). This is tested in a few bits in the code by a call to access(2).

Most engines have their own data dictionaries (Innodb, PBXT, NDB, Falcon). Keeping these in sync with the FRMs can be problematic at best. This is especially true with distributed engines such as NDB.

The current solution is …

OurDelta build for MySQL 5.0.67 with patchset d7 is now available, in source (new!) and packaged binaries for RHEL/CentOS 4 and 5, Debian 4.0 Etch, Ubuntu 8.04 LTS (Hardy) and (new!) Ubuntu 8.10 (Intrepid).

If you already installed the OurDelta repository information, yum update or apt-get upgrade will install the updated packages for you. Please do review the special notes on backward compatibility.

See the full release …

VirtualBox is really nice, but if you’re like me, maybe you found the networking confusing. There are three ways to do it, as explained by the manual, and the best way is with host interfaces, which don’t have limitations like the inability to ping and so on. I found what I think is [...]

Today was epoch day in American history. Maybe even most important day this year, but it's not what I'd like to write about here. What does it mean for US citizens and all other people around the world? We know, but what does it mean for us - IT professionals and/or internet portals serving news for end users?

Increased number of requests to webservers, high network utilization, and huge number of queries against your databases (while on duty last night, I saw customer servers handling 10 times larger traffic than usual)..

How to deal with it? How to prepare for such events?

In the moments like that, the most important thing is to assure the continuity and high efficiency.  How to accomplish it?

The best way is through preparation for the planned event.  From past experience, we know that during the ongoing event, it is often impossible …