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      <pubDate>Sun, 15 Nov 2009 09:00:00 +0200</pubDate>
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      <category>Events</category>
      <category>Blog</category>
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         <title>Array Open Source BI seminar</title>
         <link>http://tholis.webnode.com/news/array-open-source-bi-seminar/</link>
         <description><![CDATA[On November 15, 2009 Jos van Dongen will be your host during a full-day Open Source BI seminar for Array in Nieuwegein (Netherlands). The seminar gives you a thorough overview of existing and emerging technologies and vendors. It will explain how to incorporate Open Source software into your existing BI infrastructure and shows how the OS BI suites compare to their commercial counterparts.
Click here for more details (in Dutch)]]></description>
         <pubDate>Sun, 15 Nov 2009 09:00:00 +0200</pubDate>
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         <category>Events</category>
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         <title>Pentaho, quo vadis?</title>
         <link>http://tholis.webnode.com/news/pentaho-quo-vadis-/</link>
         <description><![CDATA[The acquisition
Today Pentaho announced the acquisition of parts of the LucidEra BI solution (formerly called 'ClearView') to replace the current OLAP client JPivot. For the past couple of years JPivot has been the ugly duck in the Pentaho BI solution but although there are better/prettier open source OLAP clients available (e.g. JPalo) it was never replaced by something better, nor has there been done much work to improve JPivot. But don't get me wrong: JPivot has a lot of nice features and is...]]></description>
         <pubDate>Mon, 05 Oct 2009 12:54:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/pentaho-quo-vadis-/</guid>
         <category>Blog</category>
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      <item>
         <title>Praise for 'Pentaho Solutions'</title>
         <link>http://tholis.webnode.com/news/praise-for-pentaho-solutions/</link>
         <description><![CDATA[Reactions to the new Pentaho book I wrote together with Roland Bouman are all very positive. I especially like the extended reviews on Amazon, but the following Tweet by Mark Dathorne really blew me away:
Reading "Creating Pentaho Solutions" ... my last life changing book was "Spring in Action" ... the vibes are good for this one too!
&#160;]]></description>
         <pubDate>Mon, 14 Sep 2009 12:31:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/praise-for-pentaho-solutions/</guid>
         <category>News</category>
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      <item>
         <title>Book is published!</title>
         <link>http://tholis.webnode.com/news/book-is-out-/</link>
         <description><![CDATA[I haven't got my copy yet, but those in the US who pre-ordered 'Pentaho Solutions' got it yesterday. Here's the Pentaho team showing the fruits of our labor:

Also see Gretchen Moran's first impressions on her blog.]]></description>
         <pubDate>Sat, 22 Aug 2009 08:16:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/book-is-out-/</guid>
         <category>News</category>
      </item>
      <item>
         <title>Hardware adventures</title>
         <link>http://tholis.webnode.com/news/hardware-adventures/</link>
         <description><![CDATA[I've been assembling computers for over 10 years now, and even built PC based rack mounted servers for a company I was involved in. The advantages of building your own machines are of course the lower costs and the freedom to select and mix the best/cheapest/fastest components available (these requirements rarely go together btw). Besides, it's fun!
Having a fast computer around also allows you to validate any benchmark or vendor claim you can find on the Internet, and especially ETL or...]]></description>
         <pubDate>Sun, 02 Aug 2009 11:03:00 +0200</pubDate>
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         <category>Blog</category>
      </item>
      <item>
         <title>Open Source &amp; Dutch Politics</title>
         <link>http://tholis.webnode.com/news/open-source-dutch-politics/</link>
         <description><![CDATA[


	
	
No, this isn't about the Dutch government and their efforts to promote Open Source &amp; Open Standards, but during the trip back home from our holiday destination the following analogy occurred to me. In the Netherlands, we have a very fragmented multi-party political system. This means that after each election, a coalition needs to be formed because it's impossible for a single party to get a majority of the votes. In that sense, our political system is a bit different from the one in...]]></description>
         <pubDate>Sun, 26 Jul 2009 12:52:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/open-source-dutch-politics/</guid>
         <category>Blog</category>
      </item>
      <item>
         <title>Pentaho book near finish</title>
         <link>http://tholis.webnode.com/news/pentaho-book-near-finish/</link>
         <description><![CDATA[The Pentaho Solutions book Roland and I have been working on since last year is near publication. Great cover, isn't it?
&#160;
ps. here's a sneak preview of the reporting chapter
&#160;]]></description>
         <pubDate>Wed, 24 Jun 2009 18:09:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/pentaho-book-near-finish/</guid>
         <category>News</category>
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         <title>Lucidera calls it quits</title>
         <link>http://tholis.webnode.com/news/lucidera-calls-it-quits/</link>
         <description><![CDATA[Lucidera, a BI SaaS vendor that heavily relied on open source technology, announced that they will end business by the end of the month. Read the full story here.]]></description>
         <pubDate>Tue, 23 Jun 2009 09:40:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/lucidera-calls-it-quits/</guid>
         <category>News</category>
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         <title>TDWI Munich</title>
         <link>http://tholis.webnode.com/news/tdwi-munich/</link>
         <description><![CDATA[On June 15-17 the annual European TDWI event will take place in Munich. I'll be presenting a data mining course together with Mark Madsen.]]></description>
         <pubDate>Mon, 15 Jun 2009 09:00:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/tdwi-munich/</guid>
         <category>Events</category>
      </item>
      <item>
         <title>IT Works Open Source BI</title>
         <link>http://tholis.webnode.com/news/eclipse-demo-camp-birt-demo/</link>
         <description><![CDATA[On June 4, 2009 Jos van Dongen will be your host during a full-day Open Source BI seminar for IT Works in Brussels (Belgium). The seminar gives you a thorough overview of existing and emerging technologies and vendors. It will explain how to incorporate Open Source software into your existing BI infrastructure and shows how the OS BI suites compare to their commercial counterparts.
Click here for more details (in Dutch)]]></description>
         <pubDate>Thu, 04 Jun 2009 14:00:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/eclipse-demo-camp-birt-demo/</guid>
         <category>Events</category>
      </item>
      <item>
         <title>Pentaho and Infobright deliver virtual OS BI solution</title>
         <link>http://tholis.webnode.com/news/pentaho-and-infobright-deliver-virtual-os-bi-solution/</link>
         <description><![CDATA[People still hesitating to take a peek at open source BI solutions are now served with the easiest way by far to have a complete BI solution in operation within minutes (!). Pentaho and Infobright have jointly developed a Virtual Machine that can be downloaded from the Infobright site. Setting it up is extremely easy: download the file, hook it up to your favorite VM software (it's a VMWare image but Virtualbox from Sun runs it just as well) and you have a full featured BI solution with a fast...]]></description>
         <pubDate>Sat, 30 May 2009 18:37:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/pentaho-and-infobright-deliver-virtual-os-bi-solution/</guid>
         <category>News</category>
      </item>
      <item>
         <title>Community Choice Awards 2009</title>
         <link>http://tholis.webnode.com/news/community-choice-awards-2009/</link>
         <description><![CDATA[The best Open Source projects can now be nominated for the Community Choice Awards 2009. Fill in your entries here: ]]></description>
         <pubDate>Thu, 07 May 2009 09:24:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/community-choice-awards-2009/</guid>
         <category>News</category>
      </item>
      <item>
         <title>Pentaho book on Amazon!</title>
         <link>http://tholis.webnode.com/news/pentaho-book-on-amazon/</link>
         <description><![CDATA[The Pentaho Solutions book can already be pre-ordered on Amazon. It only needs finalizing (writing the last chapters, copy editing, expert review, author review, 2nd editing round) and printing]]></description>
         <pubDate>Fri, 03 Apr 2009 11:29:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/pentaho-book-on-amazon/</guid>
         <category>News</category>
      </item>
      <item>
         <title>Interesting TDWI post</title>
         <link>http://tholis.webnode.com/news/interesting-tdwi-post/</link>
         <description><![CDATA[The latest post on the TDWI site by Stephen Swoyer about bulk load performance contains several paragraphs written by Jos van Dongen based on his TPC-H SF100 load experiments. Please beware that there is one misquote in the article: Steve writes that OS DB's cannot load faster than 20-30 GB/Hr. This is not an absolute number and only correct considering the hardware mentioned. You can probably load &gt; 100GB with a bunch of fast SSD or SAS disks in Raid 0 or 10 but it's beyond our budget to...]]></description>
         <pubDate>Fri, 20 Mar 2009 10:07:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/interesting-tdwi-post/</guid>
         <category>News</category>
      </item>
      <item>
         <title>Open Source BI Survey online</title>
         <link>http://tholis.webnode.com/news/open-source-bi-survey-online/</link>
         <description><![CDATA[Please participate in this survey developed by Mark Madsen]]></description>
         <pubDate>Wed, 18 Mar 2009 09:18:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/open-source-bi-survey-online/</guid>
         <category>News</category>
      </item>
      <item>
         <title>MonetDB releases new version</title>
         <link>http://tholis.webnode.com/news/monetdb-releases-new-version/</link>
         <description><![CDATA[It's not even on the MonetDB website, but the new February 2009 release has been uploaded to the MonetDB download area. The good news: native installers for Debian and Ubuntu added, both 32 and 64 bit. Other good news: you can run a SF100 (100 GB) TPC-H database on a regular PC. Don't expect magic though: it's still a memory optimized column store so with only 8 GB of RAM some queries take about an hour to complete. Still, considerable performance and stability improvements compared to the...]]></description>
         <pubDate>Sat, 28 Feb 2009 12:03:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/monetdb-releases-new-version/</guid>
         <category>News</category>
      </item>
      <item>
         <title>Open Source Data Warehousing?</title>
         <link>http://tholis.webnode.com/news/open-source-data-warehousing/</link>
         <description><![CDATA[The economic downturn is causing an increasing interest in using open source (OS) solutions for BI. One of my previous blogposts already raised the issue of the missing pieces in open source analytical databases, but nevertheless more and more companies are using OS databases for data warehouse purposes. In fact, recent Gartner research indicated that almost 18% of the surveyed organizations are using MySQL as a data warehouse database. This is a bit strange, because when we look at all the...]]></description>
         <pubDate>Sun, 08 Feb 2009 12:37:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/open-source-data-warehousing/</guid>
         <category>Blog</category>
      </item>
      <item>
         <title>Who's going to buy SPSS?</title>
         <link>http://tholis.webnode.com/news/whos-going-to-buy-spss/</link>
         <description><![CDATA[2009 will be a turning point for the so called 'business analytics' market. While ETL, reporting and OLAP have become more of a commodity and merely belong to the basic set of tools needed for doing business, organizations can still beat the competition with the smart use of advanced analytics. Now most large BI vendors offer a full suite of analytical capabilities (some more mature than others with SAS of course as the leader of the pack) but the industry giants SAP/Business Objects and...]]></description>
         <pubDate>Thu, 15 Jan 2009 20:53:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/whos-going-to-buy-spss/</guid>
         <category>Blog</category>
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      <item>
         <title>Eclipse DemoCamps &amp; Holland Open Drink</title>
         <link>http://tholis.webnode.com/news/eclipse-democamps-holland-open-drink/</link>
         <description><![CDATA[During November and December 2008, individuals are invited to organize and attend Eclipse DemoCamps around the world. The Eclipse DemoCamps are an opportunity to showcase all of the cool interesting technology being built by the Eclipse community. They are also an opportunity for you to meet Eclipse enthusiasts in your city. You don't need to be a software developer to attend!
The format of a DemoCamp is pretty informal. The idea is for a group of Eclipse enthusiasts to meet up and demo what...]]></description>
         <pubDate>Tue, 02 Dec 2008 17:30:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/eclipse-democamps-holland-open-drink/</guid>
         <category>OS Events</category>
      </item>
      <item>
         <title>Where are the open source analytical databases?</title>
         <link>http://tholis.webnode.com/news/where-are-the-open-source-analytic-databases/</link>
         <description><![CDATA[Over the last few months several announcements have been made by different vendors having blended open source BI solutions with high speed analytical databases. Though this might seem good news at first, it also shows something else. Why would companies like Jaspersoft and Pentaho join forces with proprietary vendors like Vertica and Paraccel? Simple: there isn't a viable OS alternative available. Scaling efficiently beyond the 1 TB range with a product like MonetDB, LucidDB or even Infobright...]]></description>
         <pubDate>Fri, 07 Nov 2008 11:52:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/where-are-the-open-source-analytic-databases/</guid>
         <category>Blog</category>
      </item>
      <item>
         <title>Dutch Open Source conference</title>
         <link>http://tholis.webnode.com/news/dutch-open-source-conference/</link>
         <description><![CDATA[On October 28 IBM, Accenture and Redhat will organize a general interest Open Source conference covering a broad range of topics ranging from operating systems and cloud computing to CMS and... BI! Davy Nys, EMEA Sales Manager for Pentaho will introduce the Open Source Pentaho BI platform. Click here for details and registration.]]></description>
         <pubDate>Tue, 28 Oct 2008 10:00:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/dutch-open-source-conference/</guid>
         <category>OS Events</category>
      </item>
      <item>
         <title>Pentaho &amp; MySQL tutorial at T-Dose</title>
         <link>http://tholis.webnode.com/news/pentaho-mysql-tutorial-at-t-dose/</link>
         <description><![CDATA[T-DOSE is a free and yearly event held in The Netherlands to promote use and development of Open Source Software. During this event Open Source projects, developers and visitors can exchange ideas and knowledge. This years event will be held on 25 and 26 October 2008 at the Fontys  University of Applied Science in Eindhoven. On Sunday October 26 Matt Casters  (Chief Data Integration, Pentaho) and Roland Bouman (Curriculum Developer, Sun Microsystems)
&#160;
This presentation will provide a...]]></description>
         <pubDate>Sun, 26 Oct 2008 12:00:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/pentaho-mysql-tutorial-at-t-dose/</guid>
         <category>OS Events</category>
      </item>
      <item>
         <title>Bye bye Google Apps</title>
         <link>http://tholis.webnode.com/news/bye-bye-google-apps/</link>
         <description><![CDATA[Last summer I decided to give up my locally managed Email service and switch to a Premier Edition Google apps account. Sounded great, 25GB of mail storage and guaranteed uptime of 99,9% in any given month!. Well, last night around 19:15 I got this nice '502' error
&#160;
&#160;
At 20:00 I started to get a little worried but hey, 0.1% downtime translates to 0.72 hours each month which was roughly within limits. At 23:00 however I wanted action and I tried to find out how to get support. Of...]]></description>
         <pubDate>Thu, 16 Oct 2008 12:43:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/bye-bye-google-apps/</guid>
         <category>Blog</category>
      </item>
      <item>
         <title>Until 'Madison' arrives, Microsoft SQL Server runs faster on Linux </title>
         <link>http://tholis.webnode.com/news/until-madison-arrives-microsoft-sql-server-runs-faster-on-linux/</link>
         <description><![CDATA[Visitors of the latest BI summit of the Seattle based software giant were awed by a first demo of project Madison, which is basically a Windows/SQL Server based version of the recently acquired appliance vendor Datallegro. Microsoft showed how a 150 TB (yes, that's Tera, not Giga) database could perform on a 24 node MPP system. Unfortunately, the announced release date is 'first half of 2010', so considering who is telling this we shouldn't expect anything capable of putting into production...]]></description>
         <pubDate>Sat, 11 Oct 2008 13:51:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/until-madison-arrives-microsoft-sql-server-runs-faster-on-linux/</guid>
         <category>Blog</category>
      </item>
      <item>
         <title>Performance Management, Vacation style</title>
         <link>http://tholis.webnode.com/news/performance-management-vacation-style/</link>
         <description><![CDATA[The past few weeks were dedicated to my racing bike, lying in the sun, spending time with my family, sleeping in, do some sight seeing and cultural trips and being with friends. Well, those were my initial plans about a month ago. And though I did all of these things, most of my time was spent on getting my new Linux server up and running, trying to get Ubuntu running on my tablet laptop as well, building my new website, writing a couple of articles for database magazine (not finished yet,...]]></description>
         <pubDate>Sun, 03 Aug 2008 21:31:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/performance-management-vacation-style/</guid>
         <category>Blog</category>
      </item>
      <item>
         <title>Sun vs Open Source</title>
         <link>http://tholis.webnode.com/news/sun-vs-open-source/</link>
         <description><![CDATA[As you might know, there’s not a lot of OS database modelling stuff out there, but for MySQL databases, it was easy: we all used DBDesigner. It was open source, did forward and reverse engineering and could do schema and model comparisons. Basically all the functionality that you want but which you can usually only get at a very hefty price point. Now MySQL started to develop a successor to DBDesigner and released the MySQL Workbench. So far, so good you might say, but hold on. Forward and...]]></description>
         <pubDate>Thu, 17 Jul 2008 10:22:00 +0200</pubDate>
         <guid isPermaLink="true">http://tholis.webnode.com/news/sun-vs-open-source/</guid>
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