Re: How to implement table caching

Andrus,

You might consider something like materialized views:

http://jonathangardner.net/PostgreSQL/materialized_views/matviews.html

Whether table caching is a good idea depends completely on the  
demands of your application.

--
Thomas F. O'Connell
Co-Founder, Information Architect
Sitening, LLC

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On Aug 14, 2005, at 1:12 PM, Andrus Moor wrote:

> To increase performance, I'm thinking about storing copies of less
> frequently changed tables in a client computer.
> At startup client application compares last change times and  
> downloads newer
> tables from server.
>
> CREATE TABLE lastchange (
>   tablename CHAR(8) PRIMARY KEY,
>   lastchange timestamp without time zone );
>
> INSERT INTO lastupdated (tablename) values ('mytable1');
> ....
> INSERT INTO lastupdated (tablename) values ('mytablen');
>
> CREATE OR REPLACE FUNCTION setlastchange() RETURNS "trigger"
> AS $$BEGIN
> UPDATE lastchange SET lastchange='now' WHERE tablename=TG_RELNAME;
> RETURN NULL;
> END$$  LANGUAGE plpgsql STRICT;
>
> CREATE TRIGGER mytable1_trig BEFORE INSERT OR UPDATE OR DELETE ON  
> mytable1
>    EXECUTE PROCEDURE setlastchange();
> ....
> CREATE TRIGGER mytablen_trig BEFORE INSERT OR UPDATE OR DELETE ON  
> mytablen
>    EXECUTE PROCEDURE setlastchange();
>
> Is table caching good idea?
> Is this best way to implement table caching ?
>
> Andrus.