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Try It Out: Taking a Database Offline
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1. Open SQL Server Management Studio and open a Query Editor pane. Enter and execute the following code: USE master GO ALTER DATABASE ApressFinancial SET OFFLINE
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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2. Try to click some of the nodes for the ApressFinancial database, for example, the Tables node; We will be reminded that the database is offline, and therefore cannot be viewed or modified, as shown in Figure 7-1. We will also not be able to access the database through any application such as Query Editor.
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Figure 7-1. Database is offline and therefore unable to be opened. To take a database offline, SQL Server must be able to gain exclusive access to the database. This means that no user can be in the database when we issue the command. If users are connected, then the query will continue to execute until all users are disconnected. As said earlier, that s all there is to it. Our database is now no longer available for any updates of data, or modifications, and so can be backed up using any backup utility that takes files from a hard drive. If you have to restore from a backup completed this way, don t forget to take the database offline first, then restore from the backup, and then bring the database back online, ready for use: USE master go ALTER DATABASE ApressFinancial SET ONLINE There is one area to note when using backup strategies that employ these methods. If you have a server backup that runs, for example, at 0200 hours, do you fancy getting up every night, just before 2 a.m., taking the database offline, and then bringing the server back up once the backup is complete No not many people would. Of course, there are installations where people are working through the night, so this is less of a problem, but what if they are busy Or forget Then your whole backup will fail because the files are in use, and therefore the server will not backup these files. So let s now look at a more friendly method of backing up the data by using SQL Server instead.
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Backing the Data Up
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Using SQL Server to back up the database will be the method used by the majority of readers. By using SQL Server, we are keeping the backup of the database under the control of an automated process that can control its own destiny, and as you will find out later, it can also control the system when things go wrong. The backup will be split into two parts. The first part, which will be covered here, will be when we perform the backup manually each time. Obviously this means we have to be available to perform the backup, but this can be rectified quite easily. Once this has been covered,
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CHAPTER 7 DATABASE BACKUPS, RECOVERY, AND MAINTENANCE
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the next section will schedule a backup to run at a specific time, which will relieve us of needing to be available to complete a backup at the specified time. Let s start by looking at the manual backup.
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Try It Out: Backing Up the Data
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1. Ensure SQL Server Management Studio is running. Find our database, right-click, select Tasks, and then click Back Up. 2. This then brings up the SQL Server Back Up Database dialog box. Take a moment to peruse this dialog box. As Figure 7-2 shows, a lot appears on this screen, which will be dealt with a section at a time.
Figure 7-2. Backing up a database (full recovery model) Although we have chosen our own database to back up, we could alter which database by changing the value in the combo box. Next is the backup type, of which we have three options to choose from: Full, Differential, and Transaction Log. The first possibility, full backup, is straightforward. Selecting the Full option will ensure that the whole database will be backed up. All the tables, the data, and so on are backed up if we use this option. We also back up enough of the transaction log (transactions committed via code, but not physically applied to the relevant tables at the point of backup).
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