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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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Figure 7-24. Options for the maintenance plan 5. This then brings us to a summary of the options that have been selected. It is now possible to move the options to a different order if you wish. As you can see in Figure 7-25, the Back Up Database (Full) option has been moved up to the start. This is in case any of the following options fail and cause corruption. This is a decision that you have to make as any restore may require a rerun of the commands after the full backup. Once you have the order you want, click Next.
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Figure 7-25. Options order for the maintenance plan
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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6. The wizard then moves on and takes each task one at a time and gives you a dialog box containing options available for that task. The first option we had was a full backup, as shown in Figure 7-26. Most of this is very similar to the backup we completed earlier. However, it is possible to select specific databases or all databases as part of this plan. Select the Specific Databases option to be taken to a second screen where you can define them.
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Figure 7-26. Defining the database backup 7. When you choose to back up specific databases, Figure 7-27 appears. Here you can select only for this task within the plan which database or set of databases you want to work with. You will get this screen for every task option, so I will only show it this once. It is best to have separate maintenance plans for the user databases and one separate maintenance plan for the system databases. This splits up the workload not only into sizable, useful, and easy-to-understand units of work, but also into logical components as each database may have a different maintenance plan. You will also have different requirements for the system databases from for the user-defined databases. It is preferable not to select the All User Databases option because SQL Server will automatically begin running the maintenance plan on databases that may have been added without your knowledge, and may not be under your ownership. For our example, select the ApressFinancial database after clicking the These Databases radio button. Click OK. The full list of choices is as follows:
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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All Databases: Specifies all system and user databases All System Databases: Ignores all user databases, such as ApressFinancial All User Databases: Ignores any system defined database, such as master, model, etc. These Databases: Allows you to select which system and user databases you wish to use
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Figure 7-27. Selecting the database to use 8. By clicking Next in the subsequent screen, which you see in Figure 7-28, we move on to the next task in the list where SQL Server will perform a special SQL Server command that will check the integrity of the database to see that everything is in a stable and noncorrupt state.
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Figure 7-28. Database integrity check
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
9. Moving on, we can define when to reduce the logical or physical size of our database through the screen shown in Figure 7-29. This can be thought of like a defrag of your hard drive. The Remove Unused Space from Database Files option will shrink the database if it has space it is not fully using. After you select this option, you will be given the opportunity to still leave a given percentage of space free for database growth. Do not fully shrink the database to 0% of free space or your performance will be worse, as the database will have to automatically grow.
Tip The preceding isn t the best process to perform or be encouraged. You should have autogrow kicking in, but you should try to size the database adequately to cope with normal operation. Performance will be better with unused space rather than autogrow kicking in as well.
Figure 7-29. Shrinking the database 10. Click Next to bring up the Define Reorganize Index Tag screen, shown in Figure 7-30. As data is added, modified, and deleted, indexes, like tables, can also require reorganizing, which you can do through this screen. Again, this is like a hard drive defrag where there are gaps or data out of order, and by reorganizing indexes you will ensure that SQL Server will be able to access the data as fast as possible. This option, which should be completed at least weekly for a high data modification system, will only move index pages.
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