SET OutputCache Duration=300 but page is not caching

Discussion in 'ASP.NET 2.0' started by kim_sacramento, Jan 8, 2007.

  1. kim_sacramento

    kim_sacramento

    I set up an RSS page intending that it would cache, only regenerating and hitting the DB once every 5 minutes. But the DB update is running on every refresh - as indicated by the changed lastBuildDate on each refresh:

    http://www.calcatholic.com/rss/newsfeed.aspx

    I created a simple demo of the problem. This page often does cache, but still often does not - keep refreshing and see:

    http://www.calcatholic.com/rss/cachetest.aspx

    FULL SOURCE OF DEMO IS BELOW - I left in the same using and a query string process to closely match the actual page.

    On one hand I don't care - more DB traffic is "free" - on the other hand I was trying to design with respect for CPU load on a shared server - and ideas?

    CACHETEST.ASPX:

    <%@ Page Language="C#" CodeFile="cachetest.aspx.cs" Inherits="newsfeed" EnableViewState="false" %>
    <%@ OutputCache Duration="300" VaryByParam="lang;daysback;cat" %>

    CACHETEST.ASPX.CS:

    using System;
    using System.Configuration;
    using System.Data;
    using System.Data.SqlClient;
    using System.Text;
    using System.Web;
    using System.Xml;

    public partial class newsfeed : System.Web.UI.Page
    {
    protected void Page_Load(object sender, EventArgs e)
    {
    string pLang = string.Empty;
    object ol = Request.QueryString["lang"];
    if (ol != null)
    {
    pLang = ol.ToString();
    }
    else
    {
    pLang = "en";
    }
    Response.Write("<html><h1>Cache Test: " + DateTime.Now.ToString()+ "</h1>\n");
    for (int i = 0; i < 300; i++)
    Response.Write("<li>Just adding some content ....." + DateTime.Now.ToString() + "\n");

    Response.Write("</body></html>\n");
    }
    }
     
    kim_sacramento, Jan 8, 2007
    #1
  2. vvsharma

    vvsharma

    vvsharma, Jan 8, 2007
    #2
  3. kim_sacramento

    kim_sacramento

    Vikram,


    Yes, I don't see it consistently on the test case, but refreshing here you see that the cache is not working, causing a DB hit every time:


    http://www.calcatholic.com/rss/newsfeed.aspx


    The only difference between the cachetest is that it calls a function the does a query and then writes out objXML instead of calling the Response.Write().


    I don't want to paste that code in the forum, but you may examine it on my server, or I can email it to you as a zip.


    (This is not causing a problem, so set the priority accordingly.)


    Thanks,


    Kim
     
    kim_sacramento, Jan 8, 2007
    #3

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