查询数据库内存不足java.lang.OutOfMemoryError: Java heap space,该怎么处理

String select = "select itemid from " + ITEMS + " where itemid>91592607 ";            String update = "update " + ITEMS + " set view=? where itemid=?";            int[] iids = new int[5];            try {                pstmt = conn.prepareStatement(select);                pstmt2 = conn.prepareStatement(update);                rs = pstmt.executeQuery();//报错行at GetUserData.main(GetUserData.java:52)                rs.setFetchSize(1000);