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One of the most powerful features of policy-based management is the variety of ways in which checks and violations can be defined and managed at an individual policy level. In the previous section we covered the four evaluation modes: On Change Prevent, On Change Log Only, On Schedule, and On Demand. Let s take a look at an example of each of these methods, starting with On Demand. ON DEMAND When you create a policy using the On Demand evaluation mode, the policy is created in a disabled state. You can then use it in an ad hoc manner as required by right-clicking the policy and choosing Evaluate. Let s do this for the Surface Area Configuration policy we imported earlier. Figure 8.7 shows the evaluation results of this policy. In this example, the evaluation failed because the target server has Database Mail enabled. In addition to clicking View to see the details of the evaluation, you can click Apply, which will reconfigure the server to be compliant with the policy. ON CHANGE PREVENT You may wish to enforce certain policies so that violations are prevented from occurring. Unfortunately, this is only possible for a certain class of conditions, specifically those able to be rolled back with DDL triggers. As an example, figure 8.8 contains the error message returned when a table create statement violates a table name condition specifying that tables must be created with a tbl_ prefix.

Figure 8.8 The On Change Prevent evaluation mode will actively prevent changes that violate policy conditions.

Right angle trigonometry is closely related to the circle Figure 8-8 shows a circle on a right angle coordinate system with a radius and the projection of that radius on both the x- and y-axes The radius is 1 If the angle is measured counterclockwise f om the x-axis (mathematicians always measure angles counterclockwise), then the sine and cosine are defrned as:

Like On Change Prevent, On Change Log Only actively monitors for policy violations, but rather than roll back the violation, it logs the violation to the SQL Server log. Regardless of the evaluation mode, all policy failures are logged,1 enabling custom policy failure alerts to be set up, a process we ll cover in chapter 14. Figure 8.9 shows such a policy failure error in the SQL Server log.

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The On Schedule evaluation mode lets you enable policies to be checked on a scheduled basis. This mode ensures that the overhead of active policy checking doesn t impact performance. When you choose this mode, the policy creator selects a schedule, which creates SQL Agent jobs to run the scheduled policy checks. Now that we ve looked at the process of importing policies and covered the evaluation modes, let s walk through the process of creating a new policy to check database properties such as AutoClose and AutoShrink.

The first step in creating a new policy is to right-click Policies under Policy Management and choose New Policy. You then enter a policy name and either choose an existing condition or create a new condition. In the example shown in figure 8.10, we ll create a policy called Database Properties Policy and create a new condition. We ll use the Database facet and specify that both AutoClose and AutoShrink should be false.

This is a discontinuous function Though it is defined everywhere over the interval, the limit as zero is approached fiom the positive side is 4, and the limit as zero is approached from the negative side is 3 The fhction is shown graphically in Fig 2-7

After clicking OK, we re returned to the policy definition screen shown in figure 8.11. Here we select Every Database for the condition s target. For the evaluation mode, we ll choose On Schedule and create a new schedule for Nightly 11PM.

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