Decibel! escreveu:
On Wed, Aug 08, 2007 at 08:56:47AM -0300, Andr? Volpato wrote:
Hello everybody,
I�m working with a small project to a client, using Postgres to
store data in a dimensional model, fact-oriented, e.g., a Datamart.
At this time, all I have is a populated database, with the "star
schemma" common relations (PK�s / FK�s).
Below is a list of the main goals of this project :
1. Front-end app (PHP5)
2. Transactional database for this app (Postgres)
3. Datamart in Postgres (described above)
4. ROLAP server that supports Postgres (Java - Mondrian)
5. Front-end app to manage querys to the ROLAP server (JSP - JPivot)
Users will have web access to (1), and will be enable to create
views using (5).
It seems like I�m trying to reinvent the wheel, but the point here
is that the client can�t afford to use proprietary BI solutions, nor
proprietary OS.
What I have read all across the internet is that Postgres does not
support this kind of application, wich demands materialyzed views,
built-in bitmap index, and so on. In the open-source world, I find
those missing features with Mondrian/JPivot.
Does anyone has ever used this structure before ? At least Mondrian
and JPivot ?
I haven't but it's certainly possible to build a datamart without bitmap
indexes or mviews, it's just a question of performance. MViews you can
build yourself easily enough; as for bitmap indexes, IIRC you can get
those in Bizgres.
That´s right, I´m pretty sure Postgres could be used as ROLAP server in
this case.
Performance is not a problem in this project.
The reason why I suggest using Mondrian [1] is the ability to have a
tool such as JPivot [2], wich implements
tipicaly OLAP navigations, like drill-down and slice/dice.
Can anyone point out another OLAP tool, that works with Postgres ?
[1] http://mondrian.pentaho.org/
[2] http://jpivot.sourceforge.net
--
[]´s,
André Volpato
ECOM Tecnologia Ltda
andre.volpato@xxxxxxxxxxxxxxxxxxxxx
(41) 3014 2322
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