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* This is not scalable and can be really slow on medium-sized databases.
For instance, MySQL cannot use indexes with such criteria, so it has to process the whole data.
* This is not a *google-like* search, and complex queries like `zend -framework "php core"` are not possible. Users often expect more than just a substring search.
While both Postgresql and MySQL include an embedded full-text search, this kind of search is often handled by another service. The most well-known free systems are Xapian, Sphinx and Lucene.
For instance, the [DGSphinxSearch Extension](http://www.yiiframework.com/extension/dgsphinxsearch) shows how to integrate [Sphinx Search](http://sphinxsearch.com/) into Yii.
There are already some yii extensions for this:
- [**Sphinx**](http://sphinxsearch.com/) : [DGSphinxSearch Extension](http://www.yiiframework.com/extension/dgsphinxsearch)
- [**Solr (Lucene)**](http://lucene.apache.org/solr/) : [Solr Extension](http://www.yiiframework.com/extension/solr/)
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