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In cases where you expect widely varying numbers of rows to be returned by your SPs, you can override parameter sniffing on a per-procedure basis. Overriding parameter sniffing is simple just declare a local variable in your SP assign the parameter value to the variable, and use , the variable in place of the parameter in your query. When you override parameter sniffing, SQL Server uses the source table data distribution statistics to estimate the number of rows to return. The theory is that the estimate will be better for a wider variety of possible parameter values. In this case, the estimate will still be considerably off for the extreme case of the 504 rows returned in this example, but it will be much closer and will therefore generate better query plans for other possible parameter values. Listing 6-14 alters the SP in Listing 6-13 to override parameter sniffing. Figure 6-10 shows the results of calling the updated SP with a @Prefix parameter of M%.

You will see the Add an Account screen, where you can fill in the name, e-mail address, and password of the user whose account you are setting up (see Figure 10 12). Enter the user's e-mail address and password, and click the Create button when you are finished.

ERD is that ERD will replace any missing or corrupt system files without formatting any hard drives or reconfiguring any storage partitions. By comparison, ASR will reformat the boot and system partitions.

Listing 6-14. Overriding Parameter Sniffing in an SP ALTER PROCEDURE Production.GetProductsByName @Prefix NVARCHAR(100) AS BEGIN DECLARE @PrefixVar NVARCHAR(100) = @Prefix;

If the client doesn t automatically enumerate the account information for the user, you can enter the account credentials and server information manually, selecting CalDAV as the Account Type, as shown in Figure 10 13.

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SELECT p.Name, p.ProductID FROM Production.Product p WHERE p.Name LIKE @PrefixVar; END GO With parameter sniffing overridden, the query plan for the SP in Listing 6-14 uses the same estimated number of rows, in this case 27.0914, no matter what value you pass in the @Prefix parameter. This results in a query plan that uses a nonclustered index seek not an index scan which is a much better query plan for the vast majority of possible parameter values for this particular SP .

Caution ASR only saves information that s stored on the system and boot partitions. Data stored on other volumes won t be included in an ASR backup and will not be restored as a part of the ASR process. You can either back up these other volumes separately or use the Back up everything on this computer option in the Windows Backup Wizard to create a full backup of all data on your server in addition to an ASR backup set.

As I discussed previously in this chapter, SQL Server optimizes performance by caching compiled query plans. This eliminates the overhead associated with recompiling your query on subsequent runs, but occasionally this feature can cause performance to suffer. When you expect your SP to return widely varying numbers of rows in the result set with each call, the cached query execution plan will only be optimized for the first call. It won t be optimized for subsequent executions. In cases like this, you may decide to force recompilation with each call. Consider Listing 6-15, which is an SP that returns order header information for a given salesperson. Listing 6-15. SP to Retrieve Orders by Salesperson CREATE PROCEDURE Sales.GetSalesBySalesPerson (@SalesPersonId int) AS BEGIN SELECT soh.SalesOrderID, soh.OrderDate, soh.TotalDue FROM Sales.SalesOrderHeader soh WHERE soh.SalesPersonID = @SalesPersonId; END GO There happens to be a nonclustered index on the SalesPersonID column of the Sales. SalesOrderHeader table, which you might expect to be considered by the optimizer. However, when this SP is executed with the EXECUTE statement in Listing 6-16, the optimizer ignores the nonclustered index, and instead performs a clustered index scan, as shown in Figure 6-11. Listing 6-16. Retrieving Sales for Salesperson 277 EXECUTE Sales.GetSalesBySalesPerson 277;

NOTE: If you are using Mobile Access to remotely access the iCal service from client systems, those systems will invariably not be using Kerberos for connectivity. If you don t enable Kerberos or SSL, you will be prompted as to whether you want to use an unsecured connection. Now, you can click the Continue button to complete the setup of your server, as shown in Figure 10 14.

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