int iOldTokenizer, iNewTokenizer;
    if( g.argc<4 ) usage("tokenizer porter|on|off|trigram");
    iOldTokenizer = search_tokenizer_type(0);
    db_set("search-tokenizer",
           search_tokenizer_for_string(g.argv[3]), 0);
    iNewTokenizer = search_tokenizer_type(1);
    if( iOldTokenizer!=iNewTokenizer ){
      /* Drop or rebuild index if stemmer changes. */
      /* Drop or rebuild index if tokenizer changes. */
      iAction = 1 + ((iOldTokenizer && iNewTokenizer)
                     ? 1 : (iNewTokenizer ? 1 : 0));
    }
  }

  /* destroy or rebuild the index, if requested */
  if( iAction>=1 ){