code: protected void createMapping(String id) {
  		DatabaseEntry key = new DatabaseEntry();
  		DatabaseEntry data = new DatabaseEntry();
  		IntegerBinding.intToEntry(loadCounter, key);
  		StringBinding.stringToEntry(id, data);
  		iidToIdDB.put(null, key, data); // required during name look-up
  		idToIidDB.put(null, data, key); // required during indexing
  	}
docs: This method is used to create a persistent mapping between the given id and an internal id (equal to
  the current value of {@link #loadCounter}). Should be called every time that a new vector is indexed.
  
  @param id
  The id