g_conn = ConnectDatabase(g_fout, dbname, pghost, pgport,
               username, force_password, ignore_version);

  /*
   * Start serializable transaction to dump consistent data.
   */
  do_sql_command(g_conn, "BEGIN");

  do_sql_command(g_conn, "SET TRANSACTION ISOLATION LEVEL SERIALIZABLE");

  /*
     * Read-lock target tables to make sure they aren't DROPPED or altered
     * in schema before we get around to dumping them.
     *
     * Note that we don't explicitly lock parents of the target tables; we
     * assume our lock on the child is enough to prevent schema
     * alterations to parent tables.
     *
     * NOTE: it'd be kinda nice to lock views and sequences too, not only
     * plain tables, but the backend doesn't presently allow that.
     */

 if (tblinfo[i].dump && tblinfo[i].relkind == RELKIND_RELATION)
    {
      resetPQExpBuffer(lockquery);
      appendPQExpBuffer(lockquery,
                "LOCK TABLE %s IN ACCESS SHARE MODE",
             fmtQualifiedId(tblinfo[i].dobj.namespace->dobj.name,
                    tblinfo[i].dobj.name));
      do_sql_command(g_conn, lockquery->data);
    }