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Message from discussion Does a NoSQL database have better HA traits than Oracle with two-way replication for a medium (100 GB) database?
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Georges DICK  
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 More options Mar 7 2012, 11:18 am
From: Georges DICK <georges.d...@gmail.com>
Date: Wed, 7 Mar 2012 17:18:44 +0100
Local: Wed, Mar 7 2012 11:18 am
Subject: Re: Does a NoSQL database have better HA traits than Oracle with two-way replication for a medium (100 GB) database?
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I think you should find an answer here :
http://en.wikipedia.org/wiki/CAP_theorem

In short : NoSQL DB can offer better availability, because they can be
"Partition Tolerant"... but at the cost of loosing the Consistency (one of
the biggest strength of RDBMS).

BTW, for 150000 transactions per day, on a train ticket selling
platform, IMHO you shouldn't make the sacrifice of Consistency, and you
don't have to : even MySQL can handle this !

2012/3/7 tza...@hotmail.com <tza...@hotmail.com>

> We are designing an e-commerce web site that will sell about 20,000
> train tickets per day(about 150,00 transactions per day). a major
> requirement is High Availability(99.999%).
>  Many people tell me I should go NoSQL way.
> From what I understand - NoSQL DBs implement active-active replication
> for HA just like regular relational DBs, so they are no better than
> e.g.  Oracle with replicatoin .
> Is there something special about NoSQL databases that make it more
> resilient than relational + active-active replication ?

> Thanks, Tzahi

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--
Cordialement,

Georges DICK
email geor...@monaco.net
http://georgesdick.com


 
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