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database. In production environments, paging typically involves dynamic filters and sorting based on user requests. To focus on the paging techniques, I'll assume no filters here and a desired order of OrderDate with OrderID as a tiebreaker. The optimal index for the paging solutions that I'll present follows similar guidelines to other TOP solutions I presentedthat is, an index on the sort column or columns and the tiebreaker column or columns. If you can afford to, make the index a covering index, either by making it the table's clustered index, or if it is nonclustered, by including the other columns mentioned in the query. Remember from 3 that in SQL Server 2005 an index can contain non-key columns, which are specified in the INCLUDE clause of the CREATE INDEX command. The non-key columns of an index appear only in the leaf level of the index. In SQL Server 2000, nonclustered indexes cannot include non-key columns. You must add additional columns to the key list if you want the index to cover the query, or you must make the index the table's clustered index. If you cannot afford a covering index, at least make sure that you create one on the sort+tiebreaker columns. The plans will be less efficient than with a covering one because lookups will be involved to obtain the data row, but at least you won't get a table scan for each page request. For sorting by OrderDate and OrderID, and to cover the columns CustomerID and EmployeeID, create the following index: CREATE INDEX idx_od_oid_i_cid_eid ON dbo.Orders(OrderDate, OrderID) INCLUDE(CustomerID, EmployeeID);

Using Caching to Improve Performance and Scalability One feature of ASP.NET that can improve the performance and scalability of applications displaying dynamic data is output caching. Say that you add the following line to an aspx page: <%@ OutputCache Duration="20" VaryByParam="None" %> When the page is requested, rather than actually running the underlying code, the page is served up directly from the ASP.NET cache. For pages that are expensive to generate but that don t change frequently, output caching can provide a huge performance benefit. In the example OutputCache directive above, when the page is requested for the first time, the .NET Framework will run whatever code is required to generate the page. Anyone rerunning the page within the next 20 seconds (as specified by the Duration attribute) will get the cached copy rather than a copy created by rerunning the underlying code. The first client to request the page after the 20 seconds have expired will get a newly created copy of the page. Often, a page will be called with one or more parameters, and the parameters might change the content that is displayed. For that common scenario, the VaryByParam attribute allows you to specify a semicolon-delimited list of parameters, or * for all

In SQL Server 2000, remember to make all columns part of the key list, as the INCLUDE clause was introduced in SQL Server 2005.

C# ... DeploymentDiagnosticManager ddm = new DeploymentDiagnosticManager( "StorageAccountConnectionString", deploymentId); ...

The solution I'll present here supports paging through consecutive pages. That is, you request the first page and then proceed to the next. You might also want to provide the option to request a previous page. It is strongly recommended to implement the first, next, and previous page requests as stored procedures for both performance and encapsulation reasons. This way you can get efficient plan reuse, and you can always alter the implementation of the stored procedures if you find more efficient techniques, without affecting the users of the stored procedures.

parameters. When parameters or * is specified for VaryByParam, a separate copy of the page is cached for each set of parameters specified or for each set of all parameters, if * is specified. The same logic can be used to cache a fragment of a page. The OutputCache directive is also available for user controls. ASP.NET caching works only with ASP.NET Premium edition installed on the server.

Implementing the stored procedure that returns the first page is really simple because you don't need an anchor to mark the starting point. You simply return the number of rows requested from the top, like so: CREATE PROC dbo.usp_firstpage @n AS INT = 10 AS SELECT TOP(@n) OrderID, OrderDate, CustomerID, EmployeeID FROM dbo.Orders

In this example, ORDER BY has two purposes: to specify what TOP means, and to control the order of rows in the result set.

So what is managed code, then Managed code is code that provides enough information to allow the common language runtime to perform the following tasks: Given an address inside the code, locate the metadata describing the method Walk the stack Handle exceptions Store and retrieve security information For the runtime to carry out these tasks, the code must pass a verification process unless a network administrator has established a policy that allows code to run without verification During the verification process, the JIT compiler examines the MSIL code and the metadata to determine whether the code can be classified as type-safe Typesafe code is code that can be determined to access only memory locations that it owns This restriction ensures that the code works and plays well with other programs and that the code is safe from causing accidental or malicious corruption.

Having an index on the sort columns, especially if it's a covering one like I created for this purpose, allows for an optimal plan where only the relevant page of rows is scanned within the index in order. You can see this by running the following stored procedure and examining the plan shown in Figure 7-10: EXEC dbo.usp_firstpage;

Rows are scanned within the index, starting with the head of the linked list and moving forward in an ordered fashion. The Top operator stops the scan as soon as the requested number of rows was accessed.