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A big disadvantage to using dynamic SQL is in debugging and troubleshooting code. Complex dynamic SQL queries can be difficult to troubleshoot, and very simple syntax or other errors can be hard to locate. Fortunately, there is a fairly simple fix for that: write your troublesome query directly in T-SQL, replacing parameters with potential values. Highlight the code, and parse or execute it. Any syntax errors will be detected and described by SQL Server immediately. Fix the errors and repeat until all errors have been fixed. Then and only then revert the values back to their parameter names and put the statement back in dynamic SQL. Another handy method of troubleshooting is to print the dynamic SQL statement before executing it. Highlight, copy, and attempt to parse or run it in SSMS. You should be able to quickly and easily locate any problems and fix them as necessary.

If you have a large quantity of users, then more than likely you will not want them connected to the server for two weeks straight as they only occasionally request small bits of data from the server However, the authentication is both a waste of time for users and a higher load on the server comparably, so many will want to keep connection times at eight hours or less You ll have to collect data on how long your users Macs are asleep on an average day and use that data to base this setting on The second setting in this tab is for idle client machines, which are systems that are not asleep but just not doing anything on the server Again, the recommended configuration will really depend upon your needs and setup.

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One of the restrictions on dynamic SQL is that it cannot be executed in a UDF. This restriction is in place because UDFs cannot produce side effects that change the database. Dynamic SQL offers infinite opportunities to circumvent this restriction, so it is simply not allowed.

However, you should probably keep the disconnect exemption for Idle users who have open files to avoid both irate users and data loss You should also put a note in the Disconnect Message text field The disconnect message will show up in an alert window on the client computers when their connection to the server has been ended This can help explain to your users why they were disconnected, without them needing to track you down to ask you!.

The sp_executesql SP provides a second method of executing dynamic SQL. When used correctly, it is safer than the simple EXECUTE method for concatenating strings and executing them. Like EXECUTE, sp_executesql takes a string constant or variable as a SQL statement to execute. Unlike EXECUTE, the SQL statement parameter must be an nchar or nvarchar. The sp_executesql procedure offers a distinct advantage over the EXECUTE method: you can specify your parameters separately from the SQL statement. When you specify the parameters separately instead of concatenating them into one large string, SQL Server passes the parameters to sp_executesql separately. SQL Server then substitutes the values of the parameters in the parameterized SQL statement. Because the parameter values are not concatenated into the SQL statement, sp_executesql protects against SQL injection attacks. sp_executesql parameterization also improves query execution plan cache reuse, which helps with performance. A limitation to this approach is that you cannot use the parameters in your SQL statement in place of table, column, or other object names. Listing 18-11 shows how to parameterize the previous example. Listing 18-11. Dynamic SQL sp_executesql Parameterized DECLARE @product_name NVARCHAR(50) = N'Mountain%'; DECLARE @sql_stmt NVARCHAR(128) = N'SELECT ProductID, Name ' + N'FROM Production.Product ' + N'WHERE Name LIKE @name'; EXECUTE sp_executesql @sql_stmt, N'@name NVARCHAR(50)', @name = @product_name;

In this chapter, we looked at the process of creating user and group accounts within an Active Directory network. AD includes the Active Directory Users & Computers graphical utility to step you through creating one object at a time, or you can use command-line utilities and scripts to automate the process of creating multiple objects. We also talked about modifying the properties of user and group objects, including configuring logon scripts and other account attributes, as well as managing user profiles on an Active Directory network. In the next chapter, we ll delve more deeply into the use of Group Policy Objects (GPOs) to centrally manage users and computers in Active Directory.

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