There seems to be plenty of discussion about caching in the Application Object, however, I cant find any info on what realistic limitations there are and how they are measured.
What are the factors that will limit performance / storage of many individual or single large bits of data with application scope? eg database driven list boxes (that dont require up to the minute data) 10 * 100 options? 100 * 100 options? kb's? megs of info? How much can I cache?
We have our web site setup on two seperate servers. They are connected together through a BIG/IP server. I'm not sure how many of you are familiar with BIG/IP (load balancing) but I'll give you a quick explanation:
When a user goes to our site, they hit our BIG/IP server first. This server looks at our two web servers and determines which one has more resources to spare. The BIG/IP then redirects the user to that server, where they are on the rest of the time they are on our site.
So we have two web servers with duplicate web sites running. My problem is I need to run one application object between both servers. Is this possible, or is there a work-around?
I am developing ASP application with complicated login system. There is several group of menu options. Each have form 5 to 15 sub-options.
User can work with any combination of options and sub-options and can see only these menu options which are allowed for him. "Rights rules" are store in SQL Tables and are getting after logon.
Now a questions:
1. what is the best way to store this menu structure (Session object is not allowed because it uses Cookies) ?
2. What is the best way to handle the "rights rules" ?
Below you can find quick links to information about the Application Object. I would write a post like my CDONTS one, but I just don't have time, but when I do, I'll see if I can get one done.
An intro to the Application object, this its in JScript but its easy to change
Using the Application Object to Improve Performance
HOW TO: Declare an Array at Application Level Scope in Active Server Pages (Q165293)
A Real-World Example of Caching Data in the Application Object
W3 Schools Application Reference
HOW TO: Use the Application Object to Store ASP State
I am trying to get to the application object from a seperate class in my ASP
application and I dont want to pass the object in as the class is inherited
to lots of other classes. So i can have something like the following:
Imports System.Web.UI.WebControls.DataGrid
Namespace Classes.Inheritable
Public MustInherit Class EntityCollection
Implements IDisposable
Private mobjDataConnection As Classes.Databases.DBConnection
Public Sub New(ByVal strSQL As String)
mobjDataConnection = Application("DataConnection")
End sub
The following code exists in a Global.asa file:
----------------------------------------------
<%
Set Application("Thing")=Server.CreateObject("THINGDOER.THINGY")
%>
----------------------------------------------
Will the above code snippet:
create a non-object Application variable named "Thing" & place it in
the Contents collection of the Application object?
-----OR------
create an Application object named "Thing" & place it in the
StaticObjects collection of the Application object?
I'm having trouble with the workflow described bellow:
1. Asp page 1 on server A contains an iframe.
2. Asp page 1 submits a form targeted to the iframe, to Asp page 2 on
server B.
3. Asp page 2 runs in the iframe and at some point might decide to submit a
form targeted to the _top frame, to page 3 on Server B.
4. Page 3 loads in the top frame. Code:
Rather than opening and closing a new connection to the database on every page, I have placed that connection into an Application variable. This has worked fine so far.
My issue is that I have a logoff page where it closes that connection.But this means that users who are on the application will not be able to access that connection.The obvious answer is that I don't close the database connection.But my problem is, I would like to eventually close that database connection.
How can I determine if an application variable (not session variable) exists?How can I determine that there are not any users on the application?
My asp application allows a number of users to log into it. Each user has a different type of access level (General User, Manager or Administrator). I want the administrator to be able to see how many other users are logged into the application at a particular time. How can I do this? Would the use of an application object work for this?
View Replies View RelatedIm trying to detect multiple logins...
Im using a application object in my global.asa, for some reason it doesnt seem to work. here is my code
<script language="vbscript" runat="server">
Sub Session_OnStart
Session("LoggedIn")=0
End Sub
sub Application_OnStart()
Application("Logged")=1
End sub
</script>
In my pages if i print the Application("Logged") value, it does not show....
We have pretty simple ASP (not ASP.Net) application, which has been running fine on IIS4 and IIS5. It has now been moved to a sever running in the DMZ and managed by a 3rd party. The server is Win2003 and IIS 6.0.
Within the Globe.asa file, have an Application_OnStart SubRoutine (Visual
Basic) and it bombs out on the first line:
Application("cnSecurity_ConnectionString") = "connectionProperties"
With the error:
Server object error 'ASP 0177 : 800401f3'
Server.CreateObject failed
Globe.asa, line 25
I'm looking for a way to allow only one user to access my web form at a time. so that if there is a user using my web page / html form.. then the next user is directed to another page. So only one user is allowed access at any given time .I was hoping there is a way to do this with Application variables.
View Replies View RelatedI am currently working on a small asp application. Now I would like to store the complete database connection in the application object. Note I want to store the connection NOT the connectionstring. For that purpose I wrote a small asp include which connects to the dbase and stores the connection object to the application object. However when I use this include in my pages then it doesnt work. What I am doing wrong? Here is the code:
View Replies View RelatedI'm using application variables for a web based sales tracking application. I use the variables for stuff like connection string, database name, etc. I store the values in a asp file that is included in a login page. The assignments are in a procedure that I then call on the login page. This is done everytime a user connects to
the login page.
what's happening to the variables? Are they being overwritten everytime a user accesses the page? I'm not checking for the existence of the variables. I just call the routine everytime the page is accessed. I know the values are shared for all users but, I was wondering if I should check for the existence of variables? Will it free up resources? Should I be using locks?
ASP Caching is not happening even i enable ASP disk
cache under websites
properties,Homedirectory,Configuration,cache options..
I have given the Full Control Permissions to IIS_WPG &
Administrator to that directory...
I am getting that cache options under
websites only not individual sites.Can i know the reason
for this
Just recently we have encountered a weird problem with our
webserver...running IIS 5 and W2000 SP4
When testing an ASP page, if you get an error of some sort in your browser,
when you go into the code and fix the problem, save the changes, when you
refresh the page, the error stays there, even though the code is correct.
The problem is not fixed until you rename the page, and the open it in your
browser to work fine??
We have a website that reads data from Oracle and creates an XML file. Then
the site uses that file to access the info faster. On IIS5 we have no
problems, but on IIS6 we seem to have some caching issuses. This deals with
the Worker Processes. By default, there is only 1 Worker Process that gets
recycled after 1700 minutes or so. The problem is, that we will select some
data from the screen, which opens up another window to update the info. We
walk through the update process and change some data and it updates the page
fine. We can even check the XML file and it is changed, but if you choose to
go back into that data, the dropdowns will reflect whatever was initially in
the XML not the changes. If I increase the number of Worker Processes and
shorten their recycle time, this doesn't seem to be a problem, but for every
request I am generating a 25M file on the server that eventually gets
recycled. I don't want to load up the memory with useless files, but I want
our application to reflect the correct data. I really need to do this without
affecting any other possible web apps that may be on the box.
Never had this problem before, but my SSI's in an ASP page are caching. I don't think ASP has anything to do with it mind you. I think it's a server issue (I've never really used this hosting company before).
Is there any way (ASP or otherwise) that anyone knows of stopping a web server caching your SSI's. It's VERY annoying!
We have an IIS cluster running an ASP website. We installed the patch listed under Q239703 that allows IIS to recognize script updates and appriately not cache those ASP pages. However, since we made this change, any office documents that a user tries to download exhibit the problem listed in Q316431. We do not use any of the caching commands listed in this article (Pragma: no-cache OR
Cache-control: no-cache,max-age=0,must-revalidate). In fact we do not have anything set in the code at all with regards to caching, and the only this i can come up with is the change we made from Q239703, which is needed to stop IIS from caching ASP based pages
We are attempting to cache asp web pages in our isa server from the local county property appraiser web site to speed up access, with a 60 minute TTL (time to live).
This doesn't seem to be working - at least the pages aren't coming up any faster. Is there anything in asp that could be preventing the pages from being cached locally?
What is the best way to cache images, and stylesheets on an asp site? I currently use a .asp extension on all my pages because I use include statements to keep certain parts of my layout the same(menu, logo, footer). I have read that asp doesn't cache pages by default, and that they are processed everytime on the server. This can eat bandwidth up pretty fast.
There also seems to be a few ways to cache a page (response.expires, cache-control, public, using meta tags, and a few more).
I have a page were data can be filtered using up to 4 listboxes. Once
someone does a filter, those parameters are saved so when they come back
to the page on a subsequent visit, the listboxes are filled for them.
There is a slight performance issue if all listboxes are set to 'All'.
Can the Cache Object be used for data that is static but filtered? If
so, how? The data that is being filtered is updated once a month and I
am not using the .NET platform.
Im having a problem that some users of this Admin System Ive built have been getting. I think the problem is caching, users arent seeing the updated version. Is there anyway to force the browser to get a fresh copy of the page everytime?
View Replies View RelatedI have an application which allows users to check in/check out XML files from an MSSQL database. When checked out, the XML file resides on a network drive. This allows users to edit the file. When checked in, the XML file resides in the database etc..
Anyway - the process works fine, but after a couple of hours usage the checkin method stops working. No matter what you change in the XML file it does not update.
Checkin method:
Create FileSystemObject (FSO)
Retrieve 'Checked Out' File from the network drive using the FSO
Retrieve contents of file using ReadAll
Update database with new content
Kill FSO
THe FSO.ReadAll returns a cached/old version of the XML file. I can open the file in notepad and I can seee the changes made, but when I do a ReadAll on the file using FSO the change is not there...
The only way around this is to re-boot my PC. Is it possible the memory allocated to my application fills up and cannot create new instances? Anyone else experienced anything like this? The application is an ASP based Web Application and runs through IIS5.
I've had some periodic problems on certain (intranet)servers where IIS seems
to be caching thing in an unexpected way, or is server cached pages where
new content is expected.
The first situation is where we have a standard Top + Left + Content
framset; the left frame contains a menu which shows standard options - when
the user logs in, extra menu options are available to them, depending on
their priveleges. The menu is generated from a DB in ASP, and when the user
logs in, Javascript is used to reload the page in the left frame - eg.
re-generate menu based on logged-in user.
This used to work on all servers, but at some point in time I found that
people were logging in but were stuck with the standard menu. If we
right-clicked in the menu and chose refresh, often the correct (eg expanded)
menu would be shown.
I'm not sure where the problem is IIS or could be controlled in ASP...
The second problem is on my development machine; when I browse to my
development copy of the intranet, I dont get the icons for each menu item.
However, when I browse to the live Intranet system, the correct graphics are
shown.....
I have 2 asp pages, the first displays a drop down which it's source is from a db, user picks a value, submits to the next page. Currently if the user hits back picks a different value and submits again, the same original value is submitted again, not the newly select value...
I see lots of things talking about caching, wondering if there is something I can do so if the user goes back, using their back button, that if they select the new value and resubmit, that the new value is used and not the original value, I may have said that in a very long winded way, just wanted to be clear..
I'm developing a website, using ASP VBScript, and I'm using
Response.ServerVariable("cert_subject") to get information about the client's
certificate (smart card). But this variable is cached, the user can take the
smart card out, and the previous data is still there.
It's only until you
close the browser and reopen IE that it flushes it. Does anyone know of a way
to flush that particular variable, or force IE to relook at the cert each
time of the response call?
I have, at the top of all my scripts,
response.expires=0
which should prevent any caching of pages. All the pages contain dynamic db driven data, so I need to ensure none of the pages are cached.
One of the users has found that pages aren't updating when she navigates to them. It only happens on her computer. If you refresh the page manually, the data updates.If she logs in using a different machine, it all works fine.
She's using IE7. Does anyone who of any setting on a computer that might override the response.expires setting?
We are having a problem with a xmlhttpRequest request returning a cached version of the request - the code we are using is inserted below. Has anyone else had this problem before - or have any ideas on what we may be doing incorrectly.
xmlhttpRequest : function(url)
{
var mainPageURL = document.location.href.split("/");
var xmlhttp = new ActiveXObject("MSXML2.XMLHTTP.3.0");
try
{
var vURL = mainPageURL[0] + "//" + mainPageURL[2] + "/" +
mainPageURL[3] + "/" + url;
xmlhttp.open("GET", vURL, false);
xmlhttp.send();
if (xmlhttp.statustext != "OK")
{
alert("Failed to execute URL " + vURL + ": " +
xmlhttp.statusText);
return "";
}
else
return xmlhttp.responseText;
}
finally
{
xmlhttp = null;
}
},
--
jmt
I found this article and it seems like a good idea to put data into Application variable that doesn't change often.Caching records in memory I am new to ASP and MS Access, would like to know from you folks whether this is a good practice to, say displaying Categories and Country data of an e-commerce site using this method?
View Replies View Relatedi want to info about iis caching and a special one when i get the a site with xml http it is caching by iis ... what is the refresh period and data amount of this caching...
could anyone give me a info or url to take more info...
Is there a way to cache a query on the server's memory for a certian amount of time?
View Replies View RelatedMy problem is as follows... I wrote an ASP application that pulls data from SQL based on the query the user specified.
I am using the response.contenttype="applicaiton/x-msexcel" to display the data in Excel via IE. But it seems the content is cached that is the displayed data is independent of the query specified, unless i close down the browser.