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From John Haigh <>
Subject Re: How to create data model from RDBMS ERD
Date Thu, 23 Jun 2011 17:04:00 GMT
Here are some useful links that will help you learn how to create a data model:

WTF is a SuperColumn? An Intro to the Cassandra Data Model -

A Java Implementation of the Blog Data Model created by Arin
Sarkissian in his blog post "WTF is a SuperColumn?" -

Cassandra’s data model cheat sheet -

A Quick Introduction to the Cassandra Data Model -

Installing and using Apache Cassandra With Java Part 2 (Data model) -

Sample Blog Data Model -

Sample Data Insert Example -

John Haigh

On Thu, Jun 23, 2011 at 12:43 PM, mcasandra <> wrote:
> How should one go about creating a data model from RDBMS ER into Big Table
> Data model? For eg: RDBMS has many indexes required for queries and I think
> this is the most important aspect when desiging the data model in Big Table.
> I was initially planning to denormalize into one CF and use secondary
> indexes. However I also read that creating secondary indexes have
> performance impact. So other option is to create inverted index. But it also
> seems to be bad to have too many CFs. We have requirements to support high
> volume min of 500 writes + 500 reads per sec.
> What would you advise?
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