--- On Mon, 6/29/09, Tguru <guru@talend.com> wrote:
> From: Tguru <guru@talend.com>
> Subject: Re: [GENERAL] Switching from MySQL: ON DUPLICATE KEY UPDATE, plpgsql function
> To: pgsql-general@postgresql.org
> Date: Monday, June 29, 2009, 1:33 PM
>
> To migrate the site, you can use an open source ETL tool.
>
> Talend Open Studio is an open source ETL tool for data
> integration and
> migration experts. It's easy to learn for a non-technical
> user. What
> distinguishes Talend, when it comes to business users, is
> the tMap
> component. It allows the user to get a graphical and
> functional view of
> integration processes.
> For more information: http://www.talend.com/
>
> Justin-95 wrote:
> >
> >
> > APseudoUtopia wrote:
> >
> > thread, then logs out (intending to
> read all the other forum threads
> > at some point in the future when they log in again).
> If I used a VIEW,
> > it would automatically consider all those unread forum
> posts to be
> > read when the user logs out.
> >
> >
> > That wouldn't work. What if a user logs in, reads only
> one forum
> >
> >
> > You are keeping a list of all the forums a user has
> read, i would not
> > worry about making sure the table tracking user
> activity has duplicate
> > key values. The select can be limited to return just
> on row with the
> > highest time stamp then compare this result to figure
> out what forms
> > the user has not read yet. This eliminates one of
> problems but creates
> > a problem where table tracking user activity is going
> bloat but in low
> > traffic times delete the duplicate values.
> >
> > A similar topic was discussed on the performance
> mailing list, where
> > updates are hung for several seconds for a similar
> tracking table...
> > http://archives.postgresql.org/pgsql-performance/2009-06/msg00300.php
>
> >
> >
> >
> >
> >
> >
another option is Pentaho, is good and easy too http://kettle.pentaho.org/