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Microsoft SQL Server 2008 Administration for Oracle DBAs
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Figure 10-31 Maintenance Plan Tasks Toolbox
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to set which database or databases you want it to back up; all other settings, such as backup type, location, and compression settings, all have defaults, although in most scenarios you will probably set all properties to suit your environment In our example, we will drag the Back Up Database Task and the Notify Operator Task onto the designer surface We right-click the Back Up Database Task and select Edit, which presents us with the properties we need to set for the database backup Figure 10-32 shows the property page In this case we chose the AdventureWorks Database, set the backup location, and set the backup compression setting Next, we set the properties for the Notify Operator Task This task will be used to notify an operator if the backup task fails We set the operator to notify and set the message as shown in Figure 10-33 Now that we have the tasks on the designer surface, we need to join them together to define the order of execution and the flow of the tasks The joins between tasks are known as precedence constraints, and there are three types: Success constraint Ensures that its path is followed upon the successful completion of the previous task Failure constraint Is followed when the previous task failed to execute successfully Completion constraint previous task Is followed no matter what the outcome of the
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Figure 10-32 Back Up Database Task properties
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It is also possible to create logical AND and OR constraints for a task For example, using an AND constraint, a task will only execute if two parallel tasks prior to the next task both complete For our plan, we want the Notify Operator Task to execute only when the Back Up Database Task fails When a task is selected on the designer surface, an arrow icon appears at the bottom of the task, which allows it to be linked to another task Therefore, we drag the arrow icon from the bottom of the Back Up Database Task and join it to
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Microsoft SQL Server 2008 Administration for Oracle DBAs
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Figure 10-33 Setting the Operators to notify
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the Notify Operator Task By default, this will create a Success constraint; that is, the Notify Operator Task will execute when the backup succeeds To change it to a Failure constraint, right-click the constraint and select Failure, as shown in Figure 10-34 Our Daily Backup subplan is now complete We next create the Sunday night subplan, which will perform a series of checks and maintenance We start by clicking the Add Subplan button in the designer We then give the subplan the name Weekly Maintenance and set the schedule to run on Sunday nights at 21:00 Next we add the following tasks to the new designer surface: Check Database Integrity Task, Reorganize Index Task, Update Statistics Task, Back Up Database Task, and finally Maintenance Cleanup Task Next, we join the tasks together to flow in the order in which they were
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Figure 10-34 Joining the tasks together with a Failure constraint
added followed by setting the properties of each task In the case of the Reorganize Index Task and the Update Statistics Task, we simply let the tasks work with all indexes and statistics The Maintenance Cleanup Task is set to remove backup sets older than two weeks The resulting subplan is shown in Figure 10-35 At runtime, the T-SQL required for each task is dynamically generated before execution This ensures that the catch all tasks for example on the Update Statistics
Microsoft SQL Server 2008 Administration for Oracle DBAs
Figure 10-35 Weekly Maintenance subplan
Task which update all statistics picks up if more statistics have been added since the creation of the plan To see what T-SQL would be generated if the plan were run now, simply double-click the task (or right-click and select Edit) and then click View T-SQL Figure 10-36 shows the T-SQL that would be generated for the Update Statistics Task
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