Обсуждение: Aggregates ?? Datamart (to whatever it has implemented a DataMart using Postgres)
Aggregates ?? Datamart (to whatever it has implemented a DataMart using Postgres)
От
"Esteban Kemp"
Дата:
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 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 thing if some day postgres allow to do this, will could use postgres more confortablement 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
Re: Aggregates ?? Datamart (to whatever it has implemented a DataMart using Postgres)
От
Alvaro Herrera
Дата:
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/PostgreSQL/materialized_views/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.