Aggregates ?? Datamart (to whatever it has implemented a DataMart using Postgres)

[Esteban Kemp]

This is the Problem:

I'm building a Large DataMart with a big table and I want to improve the performace using aggregates I mean a set of table that store some specific aggregacion of the main table, like materialized views, I know that this feature is not implemented yet in postgres, And I see a interesting article to implementing this using a set of triggers, but I thing the big problem isnot the rate of the updates or the real time consistence between both table, the main and the agregates. I thing the really problem is how to let it know to the RDMS engine that this aggregates exist!, I mean when I run a query I want to the Database engine run the query against the correct table.

I thing if some day postgres allow to do this, will could use postgres moreconfortablement in Data warehouse proyect.

I read today the TODO list of postgres and I don't see anithing like this...
Any alternative??

or how you solve the problem of the agregates in yours DataMarts???
any commentari is well recived

[Alvaro Herrera]

On Mon, Sep 27, 2004 at 07:04:50PM -0400, Esteban Kemp wrote:

Esteban,

I'm building a Large DataMart with a big table and I want to improve
the performace using aggregates I mean a set of table that store
some specific aggregacion of the main table, like materialized
views, I know that this feature is not implemented yet in postgres,
And I see a interesting article to implementing this using a set of
triggers, but I thing the big problem is not the rate of the updates
or the real time consistence between both table, the main and the
agregates. I thing the really problem is how to let it know to the
RDMS engine that this aggregates exist!, I mean when I run a query I
want to the Database engine run the query against the correct table.

I think you may be interested in reading "Materialized Views in
PostgreSQL" by Jonathan Gardner.

http://jonathangardner.net/PostgreSQ.../matviews.html
You may also want to subscribe to the pgsql-es-ayuda, at
http://archives.postgresql.org/pgsql-es-ayuda. We can discuss further
there without the language barrier ...

--
Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
Este mail se entrega garantizadamente 100% libre de sarcasmo.
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