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Typically, database administrators schedule transaction log backups to occur between full backups. For example, if a full backup is performed every night, transaction log backups might be scheduled to occur every three hours during the day. We ll get into the details of transaction log files in 7, Recovering the Data. For now, however, it s important to understand that to recover data for a database using transaction logs, you must have a copy of the last full backup of the database plus an unbroken sequence of transaction log backups since the backup completed. Figure 6-8 shows the files required for a sample recovery to a specific point in time.
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New in SQL Server 7 is the ability to perform differential backups. Differential backups work much like transaction log backups as they record all the changes that occurred in the database since the last full backup. Notice that this is different from transaction log backups that generally are used to record changes that occurred since the last transaction log backup. Whereas transaction log backups generally are used to record changes that occurred since the last transaction log backup, differential backups record all the changes that occurred in the database since the last full backup. If the latest differential backup is corrupt or otherwise unavailable, you still have the option of using the prior differential backup. As is the case with a full backup, after recovery, your database will be left in a state that is consistent up to the time that the backup is completed. Figure 6-9 shows how restoring a full backup, then a differential one, can result in a consistent database. Differential backups are implemented on a schedule that is very similar to that of transaction log backups. That is, they are usually scheduled to occur at predefined times between full backup operations.
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In some cases, databases are so large that performing a full backup is not feasible at any time. In this case, you might choose to back up only certain files at certain times. Earlier,
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Figure 6-8.
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Figure 6-9.
Using differential backups to recover a database
Figure 6-10.
A database using individual files
we mentioned that database objects could be stored on specific files. SQL Server 7 allows database administrators to back up one or more files from such a database in a single operation. Figure 6-10 depicts the structure of a database that uses multiple files. Notice that the tables are stored in specific filegroups. Table 6-1 is a sample backup schedule that indicates when certain files will be backed up.
AM FL Y
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Backup Filegroup Filegroup 1 Filegroup 2 Filegroup 3
Contents Table 1 Table 2 Table 4 Table 3 Table 5 Table 6
Day of the Week (at 1:00 A.M.) Friday Saturday Sunday
Table 6-1.
A Filegroup Backup Schedule
By using the backup schedule described in Table 6-1, you can reduce the amount of data that is backed up during each operation and still keep tables consistent. However, if you lose the entire database, you will need to restore each file individually. All of the backups must be valid and usable before the database can be brought online again. Overall, however, the ability to perform file and filegroup backups provides the flexibility to manage large databases with limited hardware and other resources.
Combining Backup Operations
For larger databases, full, differential, and transaction log backups can be combined. If implemented properly, these operations together can provide a good level of data protection while minimizing the impact on performance. Generally, it is recommended that you perform differential backups between full backup operations and that you perform transaction log backups between differential backups. Although this may seem like a lot of work in setting up your data protection plan, it provides for a high level of data protection, point-in-time recovery, and minimizes the effects of backups on users. Next, we ll see how you can combine these three backup types in an optimal backup schedule.
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