1.   For this reason it is not often possible to achieve a reduction in space requirement by using an inverted file.

2.   Some writers distinguish another type of database, the inverted file.

3.   Such alternative methods may include linked lists, indexes, inverted files, random access, B-trees or other methods of file organisation.

4.   The systems of file organisation most suited to database management systems are B-trees, the various forms of list organisation and the inverted file.

5.   Another possible gain in efficiency is to hold the indexes of the inverted file in sequential order so that the binary search can be applied.

6.   The inverted file will have an index which points to lists of certain types of record.