SQL Server Backup and Restore - Simple Talk

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Chapter 10: Partial Backup and Restore set of archive tables for future reporting and auditing, stored in a read-only filegroup (this filegroup would be switched temporarily to read-write in order to run the archive process). We can perform this archiving in a traditional data-appending manner by moving all of the data from the live tables to the archive tables, or we could streamline this process via the use of partitioning functions. Once the archive process is complete and the new course data has been imported, we can take a full backup of the whole database and store it in a safe location. From then on, we can adopt a schedule of, say, weekly partial backups interspersed with daily differential partial backups. This way we are not wasting any space or time backing up the read-only data. Also, it may well be acceptable to operate this database in SIMPLE recovery model, since we know that once the initial course data is loaded, changes to the live course data are infrequent, so an exposure of one day to potential data loss may be tolerable. In our example, taking a full backup only once every three months may seem a little too infrequent. Instead, we might consider performing a monthly full backup, to provide a little extra insurance, and simplify the restore process. Performing Partial Database Backups In most DBAs' workplaces, partial backups will be the least used of all the backup types so, rather than walk through two separate examples, one for native SQL Server backup commands and one for SQL Backup, we'll only work through an example of partial backup and restore using native T-SQL commands, since partial backups are not supported in either SSMS or in the Maintenance Plan wizard. The equivalent SQL Backup commands will be presented, but outside the context of a full worked example. 350
Chapter 10: Partial Backup and Restore Preparing for partial backups Listing 10-1 shows the script to create a DatabaseForPartialBackups database with multiple data files. The primary data file will hold our read-write data, and a secondary data file, in a filegroup called Archive, will hold our read-only data. Having created the database, we immediately alter it to use the SIMPLE recovery model. USE [master] GO CREATE DATABASE [DatabaseForPartialBackups] ON PRIMARY ( NAME = N'DatabaseForPartialBackups' , FILENAME = N'C:\SQLData\DatabaseForPartialBackups.mdf' , SIZE = 10240KB , FILEGROWTH = 10240KB ), FILEGROUP [Archive] ( NAME = N'DatabaseForPartialBackups_ReadOnly' , FILENAME = N'C:\SQLData\DatabaseForPartialBackups_ReadOnly.ndf' , SIZE = 10240KB , FILEGROWTH = 10240KB ) LOG ON ( NAME = N'DatabaseForPartialBackups_log' , FILENAME = N'C:\SQLData\DatabaseForPartialBackups_log.ldf' , SIZE = 10240KB , FILEGROWTH = 10240KB ) GO ALTER DATABASE [DatabaseForPartialBackups] SET RECOVERY SIMPLE GO Listing 10-1: Creating the DatabaseForPartialBackups test database. The script is fairly straightforward and there is nothing here that we haven't discussed in previous scripts for multiple data file databases. The Archive filegroup will eventually be set to read-only, but first we are going to need to create some tables in this filegroup and populate one of them with data, as shown in Listing 10-2. 351
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The Red Gate Guide SQL Server Backu
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Copyright April 2012 ISBN 978-1-906
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Maintenance plan backups __________
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Log Backups _______________________
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About the author Shawn McGehee Shaw
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