C# - Cache A Dataset To Stop Round Trips To Db?
Sep 11, 2010
I am creating a search results page in C# in an ASP.NET 1.1 page. In my data layer I have a DataSet that stores the result of a plain old ADO.NET stored procedure call. The DataSet has two DataTables and I'm using a DataVIew to filter and sort the columns.
I only want to fill the dataset once, and then work on the DataTables and derived DataView until the page is unloaded. How best should I cache the DataSet in my DAL so that it is filled only PageLoad? Do i put it in a Cache object, a static member variable, a property...
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Feb 11, 2010
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Sep 24, 2010
I'm trying to calculate a customer tax.
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I really nead any appropriate function to fix it.
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Jun 7, 2010
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Jan 22, 2010
MSVS 2005 asp.net 2.0 ajax enabled site..
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Sep 2, 2010
I need to use caching in my project. The problem is that, When page is firstly load ı cached a dataset. Then after after I update or insert a new record in table. my dataset returns from the cached records.
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Nov 29, 2010
I am writing a web page that returns a small volume of data from a database table. The database is polled every 1 second and the data will be the same for every user. As every user is accessing the same data, there is no need for each user to poll the database and use up db resource.
Therefore, I think I should be using application caching to store the data in a dataset. However, I am slightly stumped as to how to do this.... because how can i ensure that the dataset is kept up to date.
The only way I can think to do this is to have a master user/session (i.e. the first session in the application) that keeps the cache object updated every second, then other users can use that cache object. If the first session ends, then the next requestor of the cache will pick up responsibility for keeping the dataset up to date.
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Mar 25, 2011
I'm storing a dataset in an ASP.Net WebApplication-Cache. Every user in this intranet-app uses the same instance. On insert/update/delete-actions the database will be updated and the dataset is modified accordingly.
But rarely I get an exception that indicates that I've missed something. I assume that it must have something to do with thread safety.
Collection was modified; enumeration operation might not execute
In lines where i access a DataTable in the Dataset, for example:
Dim view As New DataView(dsERP.ERP_Charge, filter, sort, _
Data.DataViewRowState.CurrentRows)
It was apparently changed by another thread while the view enumerates the datatable.
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*ADO.NET - Multithreaded Programming ADO.NET is optimized for performance, throughput, and scalability. As a result, the ADO.NET objects do not lock resources and must only be used on a single thread. The one exception is the DataSet, which is thread-safe for multiple readers. However, you need lock the DataSet during writes.
This is the property that returns the dataset:
Public ReadOnly Property dsERP() As ERPModel.dsERP
Get
If Cache("DS_ERP") Is Nothing Then
Cache("DS_ERP") = New ERPModel.dsERP
FillDataSet()
End If
Return DirectCast(Cache("DS_ERP"), ERPModel.dsERP)
End Get
End Property
i've modified the insert/update and delete operations in the following way(dsRma is a dataset):
Dim success As Boolean
SyncLock dsRMA.RMA
success = insert()
End SyncLock
First, does it work now if another thread tries to enumerate the RMA-Table? Second, is it sufficient to lock the datarow that gets updated instead of locking the whole datatable(see below)?
Dim thisRMA As ERPModel.dsRMA.RMARow = dsRMA.RMA.FindByIdRMA(Me.IdRma)
Dim success As Boolean
SyncLock thisRMA
success = update(thisRMA)
End SyncLock
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Jul 20, 2010
Is it better to have the calculated field returned with the rest of the results or is it better to calculate it later when you need it?
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Account Number
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Or
Should I call the database when they try to continue the application and translate the Application ID into the eigit digit number so that I can use it to do my access restriction check? This will require one extra call to the database but the translation should be fast as both fields are in the same table and the application ID is a primary key. The continue application button will be used less as there are many other command options.
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Jun 27, 2010
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Then the form submits. It's obviously something to do with the Regex.
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Mar 29, 2010
Is it correct to implement my caching object like this in my controller :
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And I Use it like this :
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Feb 25, 2011
We have a wfc layer that wraps the business classes and database access and use a client that lives on the database layer. Amongst our group we are attempting to form standards. Some want to have the client call the web method and pass the page they are requesting and the page size. Pass that to the database and then page in SQL Server use RowNum.Some want to cache the full list of objects in http cache on the service tier and page in memory. They concern here is memory use on the server.
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Jul 28, 2010
What are the "optimal" parameters for creating an AppFabric cache when you will be storing session state in the cache? MSDN Cache-Related Commands
Powershell command line:
New-Cache [-CacheName] <String> [-Eviction <String>] [-Expirable <String>] [-Force [<SwitchParameter>]] [-NotificationsEnabled <String>] [-Secondaries <Int32>] [-TimeToLive <Int64>]
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Aug 1, 2010
We have a data driven ASP.NET website which has been written using the standard pattern for data caching (adapted here from MSDN):
public DataTable GetData()
{
string key = "DataTable";
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Sep 13, 2010
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Feb 26, 2010
I've got a web application that runs of a state server. It looks like soon it may need to distributed and there will be two web servers behind a load balancer.
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There are two challenges that I face
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2). The real challenge is keeping cache in sync if a simple dataset derived from the database is changed my code dumps that cache item and reloads the cache. That's all well on one webserver but webserver number two wont know to drop that particular cache item and reload it. This could cause some unexpected problems in the application.
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My guess is someone else has already been here before and there's probably a better implementation approach rather than writing extra code.
Does anyone know how I could achieve the goal of keeping Cache in sync between multiple webservers or even better farm Cache management to another server?
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