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William (Bill) Vaughn is an industry-recognized author, mentor, and subject matter expert on Visual Studio, SQL Server, Reporting Services, and data access technologies. He s worked in the computer industry for over 37 years. In 2000, after 14 years at Microsoft, Bill stepped away to work on his books, consulting, mentoring, and independent training seminars. He s written over a dozen books, including Hitchhiker s Guide to Visual Studio and SQL Server, seventh edition, and Hitchhiker s Guide to SQL Server Compact Edition. He and Peter Blackburn also wrote the critically acclaimed Hitchhiker s Guide to SQL Server 2000 Reporting Services.

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This chapter covers performance and design tips and tricks that I ve picked up over the years. When you re through with the chapter, you ll not only know how to design reports with the best possible performance, but you ll also come away with new ways of solving problems. I guarantee that no matter how expert you are in Reporting Services (RS), you ll find something new in this chapter.

8 Add a display dialog statement to display a dialog box offering to delete the album,

The first three topics all approach optimizing performance in the same manner: limiting the amount of data that the rendering engine is working on. For good performance, limit the amount of data processed by RS. Let the database engine do what it does best and use it to retrieve the smallest set of data that the report needs to render to the final state.

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Filters can be handy, but whenever possible, stay away from using them. Filters require RS to first retrieve all of the data, and then RS applies the filter. Query parameters follow the opposite processing path: query parameters let the database engine first apply the parameters to the data, then RS performs rendering tasks only on the subset of data specified by the parameters. Filters are useful when developing snapshot reports. In this case, it still makes sense to limit the data as much as possible, but filters will be necessary to allow users to apply report parameters at runtime to focus the report on the data they want to see.

and use an if statement to delete the album if the user clicks the Yes button The code appears in boldface here:

Linked servers allow you to treat data that resides on a different server as if it s on the same server. But it s easy to lose track of the fact that the data isn t all on the

(continued)

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same server. You may perform a query against a linked server in two ways. You can use four-part naming or you can use the OPENQUERY syntax. The issue is how the database engine performs the processing. For the best performance, you want to build a pass-through query the whole query should be passed on to the remote server for processing and have it return the result. Just like normal query processing, SQL Server has to make decisions on how to process the linked server data. The danger with the four-part nomenclature is that it s easy to create a query that causes the entire remote server table to be brought over the wire to SQL Server. If the table is large, you re in for a rude awakening. In SQL Server 2000, fourpart naming was almost unusable. In SQL Server 2005, it improved dramatically. If in doubt, examine the query plan it should show the processing being done remotely and should say Remote Query or Remote Scan and 100 percent. My testing has shown that even when the query plan shows 100 percent of the query being executed remotely, OPENQUERY still exhibits better performance. The code in listing 1 was executed against a table with 500K records. The OPENQUERY ran in .1 seconds and the four-part naming ran in 3 seconds.

declare @MAXDATE datetime, @SQL nvarchar(255) set @SQL = N'select @DATE = theDate from openquery(emerald,''select max(datestamp) as theDate from billing_recharge'')' select getdate()as startdate exec sp_executesql @SQL, N'@DATE datetime OUT',@MAXDATE out select getdate()as afteropenquery select @MAXDATE = max(datestamp) from emerald.iwts.dbo.billing_recharge select getdate()as after4partnaming

new album name "ABG Test" repeat with my_pic in my_pix add my_pic to album "ABG Test" end repeat display dialog "Delete the ABG Test album " buttons {"Yes", "No"} default button "Yes" with icon caution if the button returned of the result is "Yes" then remove the album "ABG Test" end if end tell