Re: Materialized Views
От | Michael Riess |
---|---|
Тема | Re: Materialized Views |
Дата | |
Msg-id | dqghgi$1ep3$1@news.hub.org обсуждение исходный текст |
Ответ на | Re: Materialized Views (Frank Wiles <frank@wiles.org>) |
Список | pgsql-performance |
Thanks! Of course I know that I can build materialized views with triggers, but so far I've avoided using triggers altogether ... I would really appreciate something like "create view foo (select * from b) materialize on query". But I'll look into your blog entry, thanks again! Mike > On Mon, 16 Jan 2006 15:36:53 +0100 > Michael Riess <mlriess@gmx.de> wrote: > >> Hi, >> >> I've been reading an interesting article which compared different >> database systems, focusing on materialized views. I was wondering how >> the postgresql developers feel about this feature ... is it planned >> to implement materialized views any time soon? They would greatly >> improve both performance and readability (and thus maintainability) >> of my code. >> >> In particular I'm interested in a view which materializes whenever >> queried, and is invalidated as soon as underlying data is changed. > > You can already build materialized views in PostgreSQL, but you > end up doing the "heavy lifting" yourself with triggers. You put > insert/update/delete triggers on the underlying tables of your > view that "do the right thing" in your materialized view table. > > I wrote a blog entry about this recently, > http://revsys.com/blog/archive/9, where I used a very simple > materialized view to achieve the performance I needed. It has links > to the relevant documentation you'll need however to build triggers > for a more complex situation. > > Hope this helps! > > --------------------------------- > Frank Wiles <frank@wiles.org> > http://www.wiles.org > --------------------------------- > > > ---------------------------(end of broadcast)--------------------------- > TIP 9: In versions below 8.0, the planner will ignore your desire to > choose an index scan if your joining column's datatypes do not > match >
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