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Although linked tables look just like your own tables when you use them in forms and reports, they re stored in another database file Every time that you access a linked table, Access must retrieve the records from that file, which takes time If the linked table is on a network or in a SQL database, this might take even more time because of network traffic You can reduce the time it takes to retrieve the records from a network or an SQL database in these ways: If you don t need to see all of the records from the linked table, use filters or queries to limit the number of records and reduce the transfer time Paging up and down among records causes Access to load the records into memory, which takes time If you want to add new records to the linked table, on the Home tab s Records group, click the New command This avoids loading all the records into memory, and then having to page through them to the end of the recordset to add new records when the table first opens in Datasheet or Form view If you usually add new records to the linked table, create a data entry form and set the form s Data Entry property to Yes This also avoids loading and displaying all the records from the linked table When you need to query a linked table, don t use functions in the criteria And, especially, don t use domain aggregate functions, which require that Access load all the data in the linked table before executing the query You can also create problems for the other users on the network who want to use the same data Lock the records no longer than necessary

14:

The Filter By Form defaults for filter lookup options for the current database can improve the performance of all tables and queries, as well as all text box controls that use the Database Default setting in the Filter Lookup property As discussed in 16, the Filter lookup group of options can limit the displayed list of values to indexed fields only or include local indexed and nonindexed fields You can also set a limit on the number of values to display in the list in the displayed filter form

From these drop-down menus, any Cache Profile can be selected In this example, caching has been set to policies appropriate for an Internet site One thing to be aware of is that any changes to a profile are immediate and affect all Page Layouts (and sites) that use them

Part III:

As you expand your use of SharePoint and begin to develop custom pages, you ll need to be sure to keep in line with the way SharePoint expects things to be with regards to caching One of the biggest reasons that you ll want to stay in line with SharePoint s regular pages is that much of the work is done for you, and there is no reason to reinvent the wheel By utilizing the structure of Master Pages and Page Layouts, users get the expected experience, regardless of the functionality your pages offer To ensure this, any page you create must inherit from the TemplateRedirectionPage class from the MicrosoftSharePointPublishing namespace If it doesn t, SharePoint won t know how to deal with the content and will not cache it (it may even throw an error) In addition, don t use cache settings for ASPNET, because this will conflict with SharePoint (you will get a page error if you attempt this) All of the directives are covered by SharePoint Actual cache control can be handled at the page level if it s extended using an IVaryByCustomHandler interface Much like an event handler, a custom handler enables you to make decisions about how a particular item is cached, based on environment, user, site, and so on Using my previous example, wherein Page Layouts were used to set what is cached, you can see that custom handlers allow you to vary the cache in the same Page Layout, based on the settings you pass A custom handler also enables you to modify cached web pages with personalization (such as a personal message with the user s name)

If the list of field values takes too long to display, you can optimize the Filter By Form for a single text box control on a form by setting the control s Filter Lookup property (on the Data tab) to Never This suppresses displaying the field values on the drop-down list in the Filter By Form window

Building a handler is not a very complicated process and it really involves only a few steps: 1 Use Visual Studio to create a VaryByCustom handler (an assembly class that provides a list of strings to the output cache for modifying the content on the returned page before sending the response 2 Register the handler in the site Globalasax file 3 Define the custom strings to vary in the Cache Profile settings; these are automatically passed to the handler when called Rather than repeat what is readily available, the SDK has a simple one page article that covers the exact code you need To read more, search for the article How to: Extend Caching by Using the VaryByCustom Event Handler in the SDK

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Summary