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Just about every type of datastore has some form of indexing. A typical relational database, such as MySQL or PostreSQL, can index fields for efficient querying. Most document databases, like MongoDB, contain indexing as well. Indexing in a relational database is almost always done for one reason: speed. However, sometimes you need more than just speed, you need flexibility. That’s where Solr comes in.

In this article, I want to outline how Solr can benefit your project’s indexing capabilities. I’ll start by introducing indexing and expand to show how Solr can be used within a Rails application.

All the power of the Solr search engine; all the beauty of Ruby. Sunspot exposes all of Solr's most powerful search features using an API of elegant DSLs. That means robust, flexible fulltext search with no boolean queries and no string programming.

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