C sqldatasource updating
Details of the exception: The database is not enabled for SQL cache notification. Close ‘Now, do what you want with the sql Dependency object like: Response. Start, passing in the connection string, to start the SQL notification engine.
To enable a database for SQL cache notification, please use SQLCache Dependency Admin. Add Cache Dependency(depends) End Sub SQL Server 2005 supports both programmatic and declarative techniques when caching. As data changes within SQL Server 2005, SQL and ADO.
Enable Notifications method, or the command line tool aspnet_ Use the string “Command Notification” in the Output Cache directive to enable notification-based caching for a page as in this example. NET automatically invalidate data cached on the Web server. NET Application After you enable a database for SQL Server cache invalidation and also enable a couple of tables within this database, the next step is to configure your application for SQL Server cache invalidation.
Caching is the process of storing frequently used data on the server to fulfill subsequent requests.
You will discover that grabbing objects from memory is much faster than re-creating the Web pages or items contained in them from scratch each time they are requested.
The second column, notification Created, shows the date and time when the table was enabled for SQL cache invalidation. NET monitors this column for changes and, depending on the value, either uses what is stored in memory or makes a new database query.
Caching increases your application’s performance, scalability, and availability.
The browser helps with client-side caching of text and images, whereas the server-side caching you choose to implement is vital for creating the best possible performance.Looking at SQL Server Now that the Northwind database and the Customers and Products tables have all been enabled for SQL cache invalidation, look at what has happened in SQL Server. Figure 1 At the top of the list of tables in the right-hand pane, you see the Asp Net_Sql Cache Tables For Change Notification table. NET uses to learn which tables are being monitored for change notification and also to make note of any changes to the tables being monitored.If you open up the SQL Server Enterprise Manager, you see a new table contained within the Northwind database-Asp Net_Sql Cache Tables For Change Notification (whew, that’s a long one! The table is actually quite simple when you look at the details, as illustrated in Figure 2.Now that you have enabled the database for SQL cache invalidation, you can enable one or more tables contained within the Northwind database.Enabling Tables for SQL Server Cache Invalidation You enable or more tables by using the following command: aspnet_-S localhost -U sa -P password -d Northwind -t Customers -et aspnet_-S localhost -U sa -P password -d Northwind -t Products -et You can see that this command is not much different from the one for enabling the database, except for the extra -t Customers entry and the use of -et to enable the table rather than -ed to enable a database.This example shows the Northwind database being disabled on my computer: C:\aspnet_regsql -S localhost -U sa -P wrox -d Northwind -dd Disabling the database for SQL cache dependency. We received the following error: C:\ aspnet_regsql -S localhost -U sa -P wrox -d Northwind -lt An error has happened.