Full-text search / Full-text index
Apart from other search methods some Document Management Systems also offer a full-text search function. This search method is especially intuitive because it enables the user to find documents on the basis of any random term within the document's text.
The archiving software's Optical Character Recognision (OCR), that composes the database of search keywords - the so-called full-text index - is crucial for the quality of the full-text search. The full-text search also requires a lot of computing power and other server recources when processing large numbers of documents.