In my Book on page 305 you have explained how you can create indexed file and how you can access for updating and reading.
For creating you must do it sequential and for updating you can make this as indexed.
Indexed Files ? ? .. ? .. ? ? ? .????????????? 305
Creating an Indexed File. ? .?????????????? 305
Retrieving and Updating an Indexed
File.. ? ? ? ? ? ? ? ? ? ? ? .?????????????????? 306
