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Regardless of how you do the scheduling, you need to specify what databases to operate on for each task (for the task types that operate at the database level). This differs from MPs in SQL Server 2000 and earlier, where you specified the databases at the plan level. The dialog boxes will look slightly different depending on whether you are using the wizard or the Designer, on how you want to schedule the plan, and on what version and service pack you are using, but, in the end, the tasks you perform inside the plan are the same. The screenshots that follow in this chapter are from SQL Server 2008, and have one schedule for the whole plan, using the wizard. You will find that your dialog boxes will look very similar even if some of these attributes differ.

This command returns this alias:

If you create your plan using the wizard, you will be presented with a number of dialog boxes that are specific to the wizard. It is pretty obvious what they do, so I will only mention them briefly here: Select Plan Properties page Here you specify the name of the plan, an optional description, and whether you want to have one schedule for the entire plan or one schedule per task. If you want one schedule for the entire plan, you can enter the scheduling page from here. Select Maintenance Tasks page Here you select what tasks you want to include in the plan. Select Maintenance Task Order page This page allows you to specify in what order each task is to be performed.

For Power The power gain of a circuit, in decibels, is calculated according to a slightly different formula If Pin is the input signal power and Pout is the output signal power expressed in the same units as Pin, then:

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In the following sections, I will describe the task types that are available in an MP. You will see that I also mention which T-SQL command or stored procedure is executed for each task. Whenever you feel you want to dive deeper and learn about the options for each command, don t hesitate to read about the command in the SQL Server Books Online. Each command is documented with all its options, and you will also learn about options that are not exposed in an MP, which can be valuable and help you decide whether or not to replace that task with your own T-SQL command. Sometimes the most difficult thing is to decide what tasks to include, and in what order, so let s start with some advice on that. I typically include the following tasks in my MPs: Database check integrity Reorganize index or rebuild index (not both) Update statistics History cleanup Backup database (often both full and transaction log and sometimes also differential) Maintenance cleanup task

The one thing I strongly discourage you from including is the shrink database task. See the following section, Shrink database task, for details. As for the order in which tasks are performed, it doesn t matter much as long as you follow best practices (for example, don t shrink and don t update index statistics if you also rebuild your indexes). One could argue that you want to check integrity before a backup (and don t do a backup if the integrity check doesn t pass), and you could argue that the other way around is better (check integrity after the backup so that you know the backup was clean). I don t recommend spending too much time on this; the important thing is choosing which tasks to perform and following best practices.

Gain (dB) = 10 log (Pout /Pin ) The coefficient (that is, the factor by which the logarithm is to be multiplied) in the formula for power gain is 10, whereas for voltage and current gain it is 20