[erlang-questions] Fw: Berkely DB was: MySQL cluster

Valentin Micic <>
Sat Oct 21 16:01:53 CEST 2006


No offence, I've read Emil's document, and as much as I appreciate his 
comparative analysis, I was hoping to get feedback from somebody that is 
actually using it.

V.

----- Original Message ----- 
From: "t ty" <>
To: "Valentin Micic" <>
Cc: <>
Sent: Saturday, October 21, 2006 3:54 PM
Subject: Re: [erlang-questions] Fw: Berkely DB was: MySQL cluster


> Emil's paper "Evaluation of Database Management Systems for Erlang" at
>
> http://www.erlang-consulting.com/aboutus/erlangarticles.html
>
> covers some of the issues.
>
> t
>
> On 10/21/06, Valentin Micic <> wrote:
>> Could anyone indicate what are main issues with Berkeley DB, assuming 
>> that
>> one does not require SQL nor flexible data-model?
>>  Thanks in advance.
>>
>>  V.
>>
>> > ----- Original Message -----
>> > From: "Roberto Saccon" <>
>> > To: "Christian S" <>
>> > Cc: <>
>> > Sent: Friday, October 20, 2006 7:18 PM
>> > Subject: Re: [erlang-questions] MySQL cluster
>> >
>> >
>> >>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.
>> >>> _______________________________________________
>> >>> erlang-questions mailing list
>> >>> 
>> >>> http://www.erlang.org/mailman/listinfo/erlang-questions
>> >>>
>> >>
>> >>
>> >> --
>> >> Roberto Saccon
>> >> _______________________________________________
>> >> erlang-questions mailing list
>> >> 
>> >> http://www.erlang.org/mailman/listinfo/erlang-questions
>> >
>> _______________________________________________
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