Why is an indexed search better than a full-text search?
The results of a search will always depend on what you are looking for. In a full-text search, if your query words do not match words in the document text, you will not get back all the relevant documents. If they do match words in the document, they may not be what the document is primarily about, so you get back a lot of irrelevant documents. If you are searching for a new and as yet undefined concept not reflected in the controlled vocabulary of indexing terms, then a full text search is preferable.
