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  1. Thread: Table macros

    by jhyde
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    Table macros

    Table macros are a new Optiq feature (since release 0.6) that combine the efficiency of tables with the flexibility of functions.
    Optiq offers a convenient model for presenting data from multiple...
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    Improvements to Optiq's MongoDB adapter

    It’s been a while since I posted to this blog, but I haven’t been idle. Quite the opposite; I’ve been so busy writing code that I haven’t had time to write blog posts. A few months ago I joined...
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    One thing that's obviously wrong is the '.' in...

    One thing that's obviously wrong is the '.' in your URL. Try jdbc:hive://localhost:10000
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    Efficient SQL queries on MongoDB

    How do you integrate MongoDB with other data in your organization? MongoDB is great for building applications, and it has its own powerful query API, but it's difficult to mash up data between...
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    Gathering requirements for olap4j 2.0

    It's time to start thinking about olap4j version 2.0.

    My initial goal for olap4j version 1.0 was to decouple application developers from Mondrian's legacy API. We've far surpassed that goal. Many...
  6. Thread: Need help

    by jhyde
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    1,164

    Need help

    I was amused by this note I just received via email.


    Subject: Need help
    To: jhyde@users.sourceforge.net
    From:

    Respected Sir, we are doing a final year project as Student Data warehouse...
  7. Thread: Optiq latest

    by jhyde
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    1,490

    Optiq latest

    Optiq has been developing steadily over the past few months. Those of you who watch github will know most of this already, but I thought I'd summarize what's been going on.


    (This post originally...
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    Announcing Lingual

    The last few months, I've been collaborating on a project with Chris Wensel, the author of Cascading. Last week we announced Lingual, an open source project that puts a SQL interface on top of...
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    Explaining holidays to a 3 year old

    Your birthday involves presents and cake. The day after your birthday you are allowed to say "I am x", where x is the number of candles on your cake.

    4th of July is the birthday of our country,...
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    Mondrian in Action in Action

    I couldn't resist. When the Mondrian in Action book is published in the spring, it will look something like this...


    ...
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    Mondrian in Action

    http://2.bp.blogspot.com/-37c3B29O4nQ/UJF8trUJtQI/AAAAAAAAAMo/p1YQBktFqzE/s1600/back_cover150.jpg
    I am delighted to announce an upcoming book all about Mondrian, called "Mondrian in Action". Some...
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    Amsterdam talk

    I'll be talking about Mondrian 4 (finally beta! yay!)
  13. Thread: Mondrian 4, XMLA

    by jhyde
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    Mondrian has an xmla servlet. The biserver-ce...

    Mondrian has an xmla servlet. The biserver-ce xmla support is a wrapper around that. It was always possible to run that servlet in a web server such as tomcat. As far as I know, you still can.

    At...
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    Pesky quoted identifiers in SQL

    The SQL that Mondrian generates is, until now, different than the SQL that most people would write by hand. Most people don't use spaces or punctuation in table and column names, and don't enclose...
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    From the ashes of the database revolution...

    With NoSQL and Hadoop, the database world has undergone a revolution. The fighting reached its peak a couple of years ago, but things have calmed down since, and now is a good time to take stock of...
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    A first look at linq4j

    This is a sneak peek of an exciting new data management technology. linq4j (short for "Language-Integrated Query for Java") is inspired by Microsoft's LINQ technology, previously only available on...
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    Data-oriented programming for the rest of us

    I have been a fan of LINQ for several years (my Saffron project covered many of the same themes) but I've had difficulty explaining why it isn't just a better Hibernate. In his article “Why LINQ...
  18. "Big Data" is dead... long live Big Data Architecture

    Now that just about every data-management and business intelligence product claims that it handles "Big Data", the term is approaching zero information content.

    So, I'm shorting the term "Big...
  19. How should Mondrian get table and column statistics?

    When evaluating queries, Mondrian sometimes needs to make decisions about how to proceed, and in particular, what SQL to generate. One decision is which aggregate table to use for a query (or whether...
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    I have logged...

    I have logged http://jira.pentaho.com/browse/MONDRIAN-1100 for this. It is not currently a committed feature.

    Also look out for the
    <MeasureGroup type="aggregate"> feature in Mondrian 4. (I'm...
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    Yes, it will probably break in mondrian-3.4. You...

    Yes, it will probably break in mondrian-3.4. You made an assumption based on the behavior of the engine at that time.

    The real solution would be support for semi-additive and non-additive...
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    Auto-generated date dimension tables

    It seems that whenever I have a cross-continent flight, Mondriangets a new feature. This particular flight was from Florida back hometo California, and this particular feature is a...
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    This was a bug: MONDRIAN-1057. Fixed in change...

    This was a bug: MONDRIAN-1057. Fixed in change 14842 (3.3.1 branch) and 14850 (main line).
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    Very strange. What JDK version are you using?...

    Very strange. What JDK version are you using? What version of Mondrian?
  25. olap4j releases version 1.0.1, switches to Apache license

    I am pleased to announce the release of olap4j version 1.0.1.


    As the version number implies, this is basically a maintenance release. It is backwards compatible with version 1.0.0, meaning that...
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    What Taqua says is true in the current release....

    What Taqua says is true in the current release. Failure to share caches is a bug in BIServer which we hope will be fixed in a release very soon. Olap4j is the official interface to Mondrian aka...
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    Changes to Mondrian's caching architecture

    I checked in some architectural changes to Mondrian's cache this week.


    First the executive summary:


    1. Mondrian should do the same thing as it did before, but scale up better to more...
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    An error has occurred in the mondrian server....

    An error has occurred in the mondrian server. There should be more information in the tomcat log.
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    olap4j moves to Apache License

    We've decided to change olap4j's license to the Apache Software License, Version 2.0 (ASL).


    I hope to find time to write a post describing in more detail the rationale for the license change and...
  30. I looks like a bug. Can you log it please, and...

    I looks like a bug. Can you log it please, and post the jira URL to this forum. Give it the description "ParallelPeriod gives wrong results if dimension does not begin on a year boundary". You've...
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    How Mondrian names hierarchies

    You may or may not be aware of the property mondrian.olap.SsasCompatibleNaming. It controls the naming of elements, in particular how Mondrian names hierarchies when there are multiple hierarchies in...
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    Luc tells me that this is probably related to...

    Luc tells me that this is probably related to incompatible versions of Xalan/Xerces.
  33. I haven't used hibernate for several years, and I...

    I haven't used hibernate for several years, and I don't know its query language very well. But given that hibernate is an O/R mapping tool, I suspect that its query language is all about entities,...
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    Real-Time Seismic Monitoring

    Marc Berkowitz wrote a blog post describing an application of SQLstream to power a seismic monitoring project that is a collaboration between several leading research institutions.

    The project is...
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    Existing

    You are correct. Mondrian does not currently support EXISTING.

    Log a feature request if it's something you would find useful.

    Julian
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    Yellowfin BI release 5.2 moves to olap4j

    According to their press release, Yellowfin BI version 5.2 "includes a significant OLAP overhaul, with the introduction of OLAP4j and support for PALO, BW as well as enhanced connectivity for SQL...
  37. Roll your own high-performance Java collections classes

    The Java collections framework is great. You can create maps, sets, lists with various element types, various performance characteristics (e.g. if you want O(1) insert, use a linked list), iterate...
  38. Removing Mondrian's 'high cardinality dimension' feature

    I would like to remove the 'high cardinality dimension' feature in mondrian 4.0.

    To specify that a dimension is high-cardinality, you set the highCardinality attribute of the Dimension element to...
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    Scripted plug-ins in LucidDB and Mondrian

    I saw a demo last week of scripted user-defined functions in LucidDB last week, and was inspired this weekend to add them to Mondrian.

    Kevin Secretan of DynamoBI has just contributed some...
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    Poll: My wife is expecting our 2nd son on July 30th, so...

    My wife is expecting our 2nd son on July 30th, so June 15th would be the ideal date. :)

    But seriously. Either date can work, as long as we have enough time to ensure that mother-in-law is in town...
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    olap4j version 1.0 released

    Today we launched version 1.0 of olap4j, the open standard API for accessing analytic databases.

    It's worth mentioning that version 1.0 is a big deal for an open source project. The tag implies...
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    Probably a bug. Can you log a jira case, with a...

    Probably a bug. Can you log a jira case, with a test case against the FoodMart schema if possible.
  43. Sounds like a bug. Can you log a jira case, and...

    Sounds like a bug. Can you log a jira case, and post a link to this thread. If possible, include a test case against the FoodMart schema. The bug is much more likely to be fixed if it does.

    Note...
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    Scalable caching in Mondrian

    Wouldn't it be great if Mondrian's cache could be shared between several Mondrian instances, use memory outside the JVM or even across several machines, and scale as the data size or computation...
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    Oracle, Hudson and Jenkins

    http://hudson-ci.org/images/logo_oracle_small.gif
    http://hudson-ci.org/images/butler.pngI've been following the furore about the Hudson open source project with some interest and amusement. Oracle...
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    "Just another big pile of data"

    Jeff Jonas writes about the challenges of managing data privacy when the data concerned is Big Data. He advocates taking a real-time approach to auditing user behavior:

    Real-time active audits. ...
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    Sounds like you've found a solution that works...

    Sounds like you've found a solution that works for you.

    If you need to apply more complex filtering conditions, or get members of multiple levels, don't forget that you can execute a...
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    An experiment with the Linux scheduler

    I was curious to see how the Linux scheduler would manifest from a program's perspective, so today I did an experiment.

    I wrote a single-threaded program running a simple loop. All the loop does...
  49. Architectural shuffling in mondrian's XMLA and olap4j servers

    As a software architect, some of my most interesting work doesn't deliver any additional functionality to end-users, but reorganizes the architecture to make great things possible in future. Since...
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    Numbers everyone should know

    Jeffrey Dean recently gave a talk "Building Software Systems at Google and Lessons Learned" at Stanford (video). One of his slides was the following list of numbers:

    L1 cache reference0.5nsBranch...
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