1. A method for fast updating of a search database, the method comprising: creating two duplicate databases using an initial set of reference signatures; searching on a first database of the two duplicate databases as the active database; updating a second database of the two duplicate databases as the standby database with new signatures for new content without locks; switching the standby database with the active database to create a new standby database; and updating the new standby database with the new signatures for the new content without locks.