Re: "Clustering"

Markus Schiltknecht wrote:
> Hi,
>
> I wrote:
> > That reminds me of the requirement of having Multi Master Replication in
> > place to do Parallel Query Execution. Sync Multi Master Replication
> > being better, while Async Multi Master Replication obviously leads to
> > inconsistent responses, when queried in parallel. That may be acceptable
> > in certain situations.
>
> Oops, during rereading "Clustering For Parallel Query Execution", I've
> noticed that you mention Data Partitioning as one possible way to do
> Parallel Query Execution. Thus Multi Master Replication obviously is not
> a requirement, but just another way to allow for Parallel Query
> Execution. Mentioning that as well would probably be good.

Uh, multi-master replication allows for load balancing, but it doesn't
help a single query to run any faster.  Think of having only one query
running on the cluster.  Parallel execution allows a single query to use
more than one computer, right?

> IMHO, the advice to use multiple, independent databases to do parallel
> query execution sounds a little meager. Of course it's also parallel
> query execution, but it's not what most people suspect to find under
> that section, I would guess.

Uh, this confuses me.  What is missing?  You split tables across
multiple servers.

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  Bruce Momjian   bruce@momjian.us
  EnterpriseDB    http://www.enterprisedb.com

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