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Apache Solr Beginner's Guide by Alfredo Serafini

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Collecting some ideas on schemaless versus normalization

Before we move to have a look at the main SolrCloud feature, I feel some more consideration of denormalization and the advantages of this approach will be useful when using Solr and similar tools. As we already pointed out, with distributed search we can obtain results even from a different shard. We could have, if needed, represented the data of different entities posted to different cores with compatible schema, and still the system should work. From this perspective, there seems to be no point in indexing data on different cores using an entity-relationship normalization approach. I tried to synthesize this simple idea in the following schema:

In the left part of this schema, we can find ...

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