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// Creates an aggregate object AggregateCacheDependency aggDep = new AggregateCacheDependency(); aggDep.Add(deps); Cache.Insert("MyData", data, aggDep)

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Any custom cache dependency object (including SqlCacheDependency) inherits CacheDependency, so the array of dependencies can contain virtually any type of dependency. The AggregateCacheDependency class is built as a custom cache dependency object and inherits the base CacheDependency class.

After you have determined the required conversion approach for your sales transaction and financial fact data, you need to determine how to identify the currency for each financial fact record so that the cube will know what conversion rate is required to perform the conversion calculation You identify the currency by defining a fact table column that contains a currency identifier code Many companies use the currency codes provided by the International Organization for Standardization (ISO 4217), which defines a set of three-character codes for each currency used in the world today ..

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Suppose your application gets some key data from a custom XML file and you don t want to access the file on disk for every request. So you decide to cache the contents of the XML file, but still you d love to detect changes to the file that occur while the application is up and running. Is this possible You bet. You arrange a file dependency and you re done. In this case, though, any update to the file that modifies the timestamp is perceived as a critical change. As a result, the related entry in the cache is invalidated and you re left with no choice other than re-reading the XML data from the disk. The rub here is that you are forced to re-read everything even if the change is limited to a comment or to a node that is not relevant to your application. Because you want the cached data to be invalidated only when certain nodes change, you create a made-to-measure cache dependency class to monitor the return value of a given XPath expression on an XML file. Note If the target data source provides you with a built-in and totally asynchronous notification

mechanism (such as the command notification mechanism of SQL Server), you just use it. Otherwise, to detect changes in the monitored data source, you can only poll the resource at a reasonable rate.

To better understand the concept of custom dependencies, think of the following example. You need to cache the inner text of a particular node in an XML file. You can define a custom dependency class that caches the current value upon instantiation and reads the file periodically to detect changes. When a change is detected, the cached item bound to the dependency is invalidated. Note Admittedly, polling might not be the right approach for this particular problem. Later on,

Keep the default settings on the Reporting Services Virtual Directories page, except clear the check box Use SSL (Secure Sockets Layer) Connections When Retrieving Data On These Virtual Directories. The Reporting Services Virtual Directories page of the setup wizard looks like this:

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in fact, I ll briefly discuss a more effective implementation. Be aware, though, that polling is a valid and common technique for custom cache dependencies.

A good way to poll a local or remote resource is through a timer callback. Let s break the procedure into a few steps: 1. The custom XmlDataCacheDependency class gets ready for the overall functionality. It initializes some internal properties and caches the polling rate, file name, and XPath expression to find the subtree to monitor. 2. After initialization, the dependency object sets up a timer callback to access the file periodically and check contents. 3. In the callback, the return value of the XPath expression is compared to the previously stored value. If the two values differ, the linked cache item is promptly invalidated. There s no need for the developer to specify details about how the cache dependency is broken or set up. The CacheDependency class takes care of it entirely. Note If you re curious to know how the Cache detects when a dependency is broken, read

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