Analysis of ASP. NET database cache

What is ASP. NET database cache? First, let's take a look at ASP. NET database cache analysis. To create scalable, high-performance Web-based applications, ASP. NET provides a feature called Data cache Data Caching. Data Cache supports storing frequently accessed Data Objects in the memory. This feature can be expanded to Improve the Performance of ASP. NET applications that query data in Oracle databases. This article describes a policy that can be used to cache Oracle Database Data Using ASP. NET Web applications in the Web Farm environment. This technique allows you to cache frequently accessed Oracle database data in the memory, rather than frequently accessing the database to retrieve data. This helps avoid unnecessary remote access to the Oracle Database Server. Furthermore, this article proposes an implementation of keeping the cached data in sync with Oracle Data.
Data caching in ASP. NET

ASP. NET database Cache analysis is supported by the Cache class and the CacheDependency class in the System. Web. Caching namespace. The Cache class provides a way to insert data to and retrieve data from the Cache. The CacheDependency class allows you to specify the dependencies of data items in the cache. When we use the Insert and Add methods to Add a project to the cache, we can specify an expiration Policy for a project. We can use the absoluteExpiration attribute of the Insert method to define the lifetime of a project in the cache. This attribute allows you to specify the exact time when the corresponding data item expires. You can also use the slidingExpiration attribute to specify the expiration time of a project based on the Access time ). Once a project expires, it is cleared from the cache. Unless it is added to the cache again, attempt to access it again will return a null value.

Set cache dependency

The Analysis of ASP. NET database cache allows us to define the dependency of a cache item based on an external file, directory, or another cache item, that is, file dependency and key dependency. If a dependency item changes, the cache item automatically becomes invalid and is cleared from the cache. When the corresponding data source changes, we can use this method to delete the project from the cache. For example, if our application retrieves data from an XML file and displays the data in a grid table, we can store the data in the file to the cache, set the XML file that the cache depends on. When the XML file is updated, the data items are cleared from the cache. When this event occurs, the application reads the XML file again, and the latest data item copy is inserted into the cache again. In addition, the callback event processor can be set as a listener and will be notified when the cache item is deleted. This makes it unnecessary to repeatedly poll the cache to determine whether the data item is invalid.

ASP. NET cache dependency on Oracle databases

Now, consider this scenario: data is stored in the Oracle database, and an ASP. NET application is accessed through ADO. NET. Further, we assume that the data in the database table is generally static and frequently accessed by this Web application. There are few DML operations on the table, but there are a lot of Select operations on the data. This is an ideal application of data cache technology. Unfortunately, ASP. NET does not allow you to set a cache item to depend on the data stored in the database table. Furthermore, in the real world, Web-based systems, Web servers and Oracle database servers always run on different machines, making invalid cache operations more challenging. In addition, most Web-based applications use Web farms, and instances of the same application run on different Web servers for load balancing. This makes the database cache a little more complicated.

The basic information about ASP. NET database cache is introduced here. I hope to help you understand ASP. NET database cache.

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