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Second, given the fact that ExecuteSql() accepts and runs any SQL (including delete statements), take into account the security implications. One of the new fixed database roles in the MSDB database is called PolicyAdministratorRole. Members of this role are able to execute policy checks. To prevent such users from executing ExecuteSql()based policies that elevate their privileges, the ##MS_PolicyTsqlExecutionLogin## SQL Server login is used as a proxy account for the execution of this function. As such, not only does this login have to be enabled, the appropriate permissions need to granted on the objects referenced in the ExecuteSql() function. Despite the wide range of facets and included policies, certain aspects of SQL Server instances and databases can t be checked in SQL Server 2008. An example is checking that all tables use data compression (covered in the next chapter). Data compression is a partition property, and there s no facet for partitions in SQL Server 2008. As such, you could use the ExecuteSql() function to query for the existence of any tables that aren t compressed, using a function like this:

This general expression for the derivative is used to determine the slope of the curve y = x 2 atanypoint When x=3,thefunctionhasvalue9andslope6 When x = 4 , t h e function has value 16 and slope 8

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Another educational area in computer careers is user training Hundreds of training companies have found training to be a lucrative business, especially in the personal computer market Computer educators can offer training and seminars as freelancers or be employed by computer stores, educational and training institutions, computer vendors, and user companies Many companies today are joining forces to fill training classes for their employees, flying in instructors Microsoft is now customizing online training courses The current emphasis on computers in elementary and secondary schools assures opportunities for trainers and educators to work at that level and other educators to train them to do it In fact, every elementary student is receiving some hands-on computer experience today

Executesql('Numeric', 'select count(*) from sys.partitions p where p.data_compression=0')

If the results of this query return a nonzero value, that means tables are present that aren t compressed. You d use such a function in a condition like the one shown in figure 8.19. Both the ExecuteSql() and ExecuteWql() functions, fully documented in SQL Server BOL, enable you to create policies with almost limitless flexibility, and could potentially be used to check policy compliance of items completely unrelated to SQL Server. In closing the chapter, let s examine how SQL Server s support of PowerShell can be used to overcome some of the limitations with using policy-based management against earlier versions of SQL Server.

Solution: Follow the definition of the derivative in equation 3- 1

Released in 2006 and included in Windows Server 2008, Windows PowerShell is a command line based scripting language used to perform administrative tasks using cmdlets. SQL Server 2008 is PowerShell aware and exposes its management interface via its own cmdlets.

Earlier in the chapter we briefly covered the ability to evaluate policies against earlier versions of SQL Server For example, by registering a SQL Server 2005 instance with the 2008 Management Studio tool, you can right-click 2005 objects and manually evaluate policies What you can t do (without using PowerShell) is store policies within a 2005 instance for scheduled evaluation as you can with a 2008 instance Enter PowerShell Using the Invoke-PolicyEvaluation cmdlet, you can evaluate policies against SQL Server instances (2000, 2005, or 2008) as a PowerShell script SQL Server 2008 also includes the ability to run PowerShell-based SQL Agent job steps, so the combination of these two features enables you to schedule policy evaluation against a variety of SQL Server versions.

Right-click a SQL Server 2008 instance in Management Studio and click Start PowerShell, to open a PowerShell interface from which you can (among other things) evaluate a policy In the example shown in figure 820, after using the sl command to change directory to the location containing the policy files, we ve used the Invoke-PolicyEvaluation cmdlet to evaluate a policy against a SQL Server 2005 instance using the PowerShell interface As you can see in the Result column, the server failed evaluation One of the nice things about the Invoke-PolicyEvaluation cmdlet is the variety of parameters it takes, a few of which are as follows: The -Policy option is used to specify the required policy to execute An alternate use of this option is to supply a comma-separated list of policies, allowing multiple policies to be executed as part of the one command.

lim (x + Ax)3 - x3 - x 3 + 3x2Ax + 3 X h 2 -

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