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Design caching strategies.
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Read UPC-A In .NET Framework
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Select ADO.NET caching. Design custom caching functionality. Design a refresh strategy for cached data. Decide when to use cursors. Decide how to maximize cursor performance. Decide which applications are using cursors and evaluate whether to remove them. Design cursor logic. Design cursors that work together with dynamic SQL execution. Select an appropriate cursor type. Design cursors that efficiently use server memory.
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Design a cursor strategy for a data access component.
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Design a cursor strategy.
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3
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Designing a Cursor and Caching Strategy
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Design cursors that minimize blocking. Design a strategy that minimizes or eliminates the use of cursors.
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Before You Begin
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To complete the lessons in this chapter, you must have:
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A computer that meets or exceeds the minimum hardware requirements listed in the Introduction. Experience designing and executing queries in SQL Server Management Studio. Experience creating Web-based applications using Microsoft Visual Studio 2005.
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Lesson 1: Designing Caching Strategies
Lesson 1: Designing Caching Strategies
Estimated lesson time: 60 minutes
Caching is the process of storing data in a cache until it is needed again. A cache is simply an in-memory representation of some data. The primary reason for caching data is to increase application performance. Caching is a good idea in cases where the data is expensive to retrieve and not likely to change. In many cases, you can achieve a significant performance advantage just by implementing the most basic caching. One of the most common ways to use caching is in the population of large datagrid controls that need to be navigated with paging. In this case, it would be very costly to requery the database every time the user goes to the next page. Caching enables you to place the data returned from ADO.NET into a cache object. You can then use the cache object as the data source for the datagrid control.
What is Output Caching
ASP.NET enables you to implement three types of caching. The first two, page level and user control level, are referred to as output caching; they are the easiest to implement. They involve adding a line of code to the top of the Web page or user control file. The third type of caching involves using the cache API to implement custom caching functionality.
Page-Level Output Caching
To implement page-level caching, you only need to specify the OutputCache directive at the top of the HTML for the Web page or .aspx file. This is used both for page-level caching and user control-level caching. Refer to Table 3-1 for the attributes that are used with the OutputCache directive. The OutputCache directive will be placed at the top of the code file, before any other directives or HTML. The following is an example of a typical directive that would be placed in a file with an .aspx extension:
<%@ OutputCache Duration="15" VaryByParam="*" %>
In this example, the Duration and VaryByParam attributes were used. The Duration attribute specifies that the page will be cached for 15 seconds. The VaryByParam attribute specifies that the cache will be varied for all query string variables.
3
Designing a Cursor and Caching Strategy
BEST PRACTICES
Avoid using asterisks
Only use an asterisk (*) for the VaryByParam attribute if you know the content is fairly static. Otherwise, you are going to be consuming a lot of system resources, storing an exponentially large number of versions in the cache. This could cause you to get little or no performance advantage from caching.
Implementing page-level caching is a quick and easy way of gaining a performance advantage for your Web pages. However, you might have to modify the duration attribute and the VaryByParam or VaryByControl attributes to find the optimum settings for your application. You can use a utility such as the Microsoft Web Application Stress Tool, which is free and available for download at http://www.microsoft.com/downloads/details.aspx FamilyID=e2c0585a-062a-439e -a67d-75a89aa36495&DisplayLang=en. This utility will simulate the execution of Web pages by multiple browsers, so you can evaluate the performance and scalability of your Web pages.
User Control-Level Output Caching
User control-level output caching, also known as fragment caching, is similar to page-level caching. The main difference is that the caching is restricted to the contents of the user control and not the entire page in which it is hosted. This gives you finer control over what is being cached. You place the OutputCache directive at the top of the file, giving it the .ascx extension. Refer to Table 3-1 for the list of attributes that can be used with this directive. Notice that some of the attributes are used only for page-level caching. The Shared attribute, however, is only applicable for user control-level caching.
Table 3-1
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