Web Services (ASMX 1.1) Performance Guidelines - Caching

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- J.D. Meier, Srinath Vasireddy, Ashish Babbar, and Alex Mackman


Consider Output Caching for Less Volatile Data

If portions of your output are static or nearly static, use ASP.NET output caching. To use ASP.NET output caching with Web services, configure the CacheDuration property of the WebMethod attribute. The following code snippet shows the cache duration set to 30 seconds.


  [WebMethod(CacheDuration=30)]
  public string SomeMethod() {  ... . }

References

For more information, see Microsoft Knowledge Base article 318299, "HOW TO: Perform Output Caching with Web Services in Visual C# .NET," at http://support.microsoft.com/default.aspx?scid=kb;en-us;318299.


Consider Providing Cache-Related Information to Clients

Web services clients can implement custom caching solutions to cache the response from Web services. If you intend that clients of your Web services should cache responses, consider providing cache expiration–related information to the clients so that they send new requests to the Web service only after their cached data has expired. You can add an additional field in the Web service response that specifies the cache expiration time.

Consider Perimeter Caching

If the output from your Web services changes infrequently, use hardware or software to cache the response at the perimeter network. For example, consider ISA firewall-based caching. Perimeter caching means that a response is returned before the request even reaches the Web server, which reduces the number of requests that need to be serviced.

References

For more information about ISA caching, see the white paper, "Scale-Out Caching with ISA," at http://www.microsoft.com/isaserver/techinfo/deployment/ScaleOutCachingwithISA.asp.

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