In response to Gregory Stark <[EMAIL PROTECTED]>:

> "Tom Lane" <[EMAIL PROTECTED]> writes:
> 
> > Thomas Kellerer <[EMAIL PROTECTED]> writes:
> >> Where else do they want to store relational data than in a RDBMS?
> >
> > Indeed.  It seems like we can hardly answer the OP's question without
> > asking "compared to what?"  If they're afraid an RDBMS won't scale,
> > what have they got in mind that they are so certain will scale?
> 
> I suspect they're misapplying the lesson Google taught everyone. Namely that
> domain-specific solutions can provide much better performance than
> general-purpose software.
> 
> Google might not use an RDBMS to store their search index (which doesn't need
> any of the ACID guarantees and needs all kinds of parallelism and lossy
> alorithms which SQL and RDBMSes in general don't excel at), but on the other
> hand I would be quite surprised if they stored their Adsense or other more
> normal use data structures in anything but a bog-standard SQL database.

Google also has enough high-calibre people that they can probably
re-invent the concept of an RDBMS if they want to.  Yet they don't.
I know a particular Googleite who's a PostgreSQL buff and is bummed
that they use MySQL all over the place.

-- 
Bill Moran
http://www.potentialtech.com

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