anchor.diff:      map_view(DbName, DDoc, ViewName, Args0, []).
   
   map_view(DbName, DDoc, ViewName, Args0, DbOptions) ->
  +    set_io_priority(DbName, DbOptions),
       Args = fix_skip_and_limit(Args0),
       {ok, Db} = get_or_create_db(DbName, DbOptions),
       VAcc0 = #vacc{db=Db},
  
positive.code:     reduce_view(DbName, DDoc, ViewName, Args0, []).
  
  reduce_view(DbName, DDoc, ViewName, Args0, DbOptions) ->
      Args = fix_skip_and_limit(Args0),
      {ok, Db} = get_or_create_db(DbName, DbOptions),
      VAcc0 = #vacc{db=Db},
  
negative.code:     end.
  
  all_docs(DbName, Options, #mrargs{keys=undefined} = Args0) ->
      set_io_priority(DbName, Options),
      Args = fix_skip_and_limit(Args0),
      {ok, Db} = get_or_create_db(DbName, Options),
      VAcc0 = #vacc{db=Db},
  