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Most of the database has support of full text search, basically indexing and saarching. MySQL, Oracle and many more databases has in-built full text search. Then what is the need to go for external search engine like Lucene, Sphinx, Solr etc. Below of are the benifits of using Searchengine over Database.
Summary: Searchengine cannot replace Database. In case of more volume, using searchengine gives search performance faster. If the data volume is less and you are not interested in learning one more library then stick around with Database is not a bad idea.
References:
http://www.findbestopensource.com/tagged/searchengine
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