Database administrators have to select fields in advance to index to satisfy user queries. Indexing all of the fields causes significant performance and disk space problems. All the fields in a database, no matter how many, may be indexed. All fields available for ad-hoc queries. DBA not required to continually add and drop indices to satisfy user needs.
Fast response ensures user satisfaction.
Complex queries The greater the number of query terms, the slower the response. The greater the number of query terms, the faster the response. Users can formulate complex queries and get very fast results without impacting system performance. These queries can often take many minutes or longer. Fields longer than 255 characters may not be searched at all.