[erlang-questions] MySQL cluster

Roberto Saccon <>
Fri Oct 20 19:18:48 CEST 2006

I had the same question and I am currently investigating in using
mnesia just as cache for a clustered web application running on amazon
EC2 and the real storage is on amazon S3 (which is kind of  Berkley DB
webservice) and capable to store any number of TBs ...

On 10/20/06, Christian S <> wrote:
> On 10/20/06, Dmitrii Dimandt <> wrote:
> > What's the optimum maximum size for Mnesia then? A bout a couple of
> > gigabytes? Or more?
> What should such a number for maximum size try to optimize?
> A note about picking database after storage size needs:
> Using mnesia instead of an external database always have advantages in
> terms of "impedance matching" (Mnesia has erlang's datatypes by virtue
> of being erlang and you can query mnesia faster than anything
> connected to through tcp). This often makes it worthwile to hack
> around mnesia to store some data outside of it.
> One would easily reach a storage size of 1Tb for a site like flickr.
> Does that mean mnesia wouldnt be sufficient for building such a site?
> Or perhaps it could be a good idea to build an application that
> replicates images across nodes outside of mnesia, and have mnesia
> store small image ids to reference them.
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Roberto Saccon

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