Answering questions asked on the site.

Juan asks:

Regarding this question:

I would like to know what database is the most efficient when performing this type of query and if the solutions proposed are already the most efficient.

I am using MySQL but I would like to know if PostgreSQL, Oracle, Microsoft SQL Server or DB2 are much more efficient.

A nice question, this is a common problem for most developers.

For those too lazy to follow the link, the problem in one sentence:

How do I select the whole records, grouped on grouper and holding a group-wise maximum (or minimum) on other column?

I’ve already covered this in …

Installing Apache2 With PHP5 And MySQL Support On Ubuntu 9.10 (LAMP)

LAMP is short for Linux, Apache, MySQL, PHP. This tutorial shows how you can install an Apache2 webserver on an Ubuntu 9.10 server with PHP5 support (mod_php) and MySQL support.

Chrome OS and Andoid to merge - eventually. Oracle and SpringSource propose Eclipse OSGi project. And more.

Follow 451 CAOS Links live @caostheory on Twitter and Identi.ca
“Tracking the open source news wires, so you don’t have to.”

For the latest on Oracle’s acquisition of MySQL via Sun, see Everything you always wanted to know about MySQL but were afraid to ask

# Gizmodo reported that Chrome OS and Android are destined to merge, somehow.

# Q&A with open government activist David Eaves about Portland’s …

I find it amazing that the U.S. Department of Justice can continue to cover its eyes and ears while Microsoft is allowed to exert its monopolistic power over all hardware manufacturers.

About 20 months ago, I was able to purchase a Lenovo Thinkpad T61 from the lenovo.com website without an operating system installed. Today, I went to purchase a new Lenovo Thinkpad laptop, again without having to pay the Windows Tax. Turns out Lenovo has stopped offering this option. What a complete PILE OF SHIT. Somebody in Microsoft’s “Business Development” or “Partners” team must have told Lenovo to stop offering its customers a simple choice of not having to pay the OEM license fees for Windows. And there’s nothing anyone can do about it. Microsoft is just too big and too pervasive for anybody to have a damn effect on them.

Frankly, it’s anti-choice, anti-competition, …

Fig. 1 MySQL per-row replication filtering

A MySQL Software preview is available which allows you to write Lua scripts to control replication on a statement-by-statement basis. Note that this is prototype functionality and is not supported but feedback on its usefulness would be gratefully received.The final version would allow much greater functionality but this preview allows you to implement filters on either the master or slave to examine the statements being replicated and decide whether to continue processing each one or not.

After reading this article, you may be interested in trying this out for yourself and want to create your own script(s). You can get more information on the functionality and download the special version of MySQL from …

We'll soon have our last MySQL University session for this year, followed by a winter break until the end of January 2010. So far there's only one session scheduled next year, but we'd like to have one session per week, so we need lots more speakers!

Anyone who has something technical to say about MySQL qualifies as a speaker. MySQL University sessions take place on Thursday afternoons European time, and normally have between 20 and 30 attendees, but quite a lot of people listen to the recordings when the live session time isn't convenient for them. We're using Dimdim as our conferencing system, so the setup for speakers is very simple: Just grab a headset, start a Flash-enabled browser on either Windows, Mac OS X, Linux, or Solaris, perform a 10-minute test with the MySQL University host, and …

We recently added support for Windows 7 to both Zmanda Cloud Backup and Amanda Enterprise. Zmanda Cloud Backup stores its backup archives on the Amazon S3 Storage Cloud. Amanda Enterprise has the option to do so. Users can backup both the Windows file systems and system state, as well as various Microsoft applications, Oracle and MySQL databases. Now we support all Windows versions supported by Microsoft, including Windows 7.

To upgrade from Windows XP to Windows 7, Microsoft recommends users to backup their Windows XP to external hard disk and then install Windows 7. Backup to (and Restore from) …

It's been some time already since I informed you about server: database: UNSTABLE repository in openSUSE Build Service. Today I want to mention what is going on there. As the name of the repository suggests, it's probably not the best idea to use anything from here on your production servers

MySQL 5.4

I'm keeping there MySQL 5.4. Currently in version 5.4.3 beta. 5.4 branch of MySQL contains some patches to improve performance. That is the reason why it might be interesting. Downside is that it isn't released as often as 5.1 and it is not considered production ready. I already wrote something about …

It’s been some time already since I informed you about server: database: UNSTABLE repository in openSUSE Build Service. Today I want to mention what is going on there. As the name of the repository suggests, it’s probably not the best idea to use anything from here on your production servers

MySQL 5.4

I’m keeping there MySQL 5.4. Currently in version 5.4.3 beta. 5.4 branch of MySQL contains some patches to improve performance. That is the reason why it might be interesting. Downside is that it isn’t released as often as 5.1 and it is not considered production ready. I already wrote …

We'll soon have our last MySQL University session for this year, followed by a winter break until the end of January 2010. So far there's only one session scheduled next year, but we'd like to have one session per week, so we need lots more speakers!

Anyone who has something technical to say about MySQL qualifies as a speaker. MySQL University sessions take place on Thursday afternoons European time, and normally have between 20 and 30 attendees, but quite a lot of people listen to the recordings when the live session time isn't convenient for them. We're using Dimdim as our conferencing system, so the setup for speakers is very simple: Just grab a headset, start a Flash-enabled browser on either Windows, Mac OS X, Linux, or Solaris, perform a 10-minute test with the MySQL University host, and …