SQL Server Backup and Restore - Simple Talk

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Chapter 7: Differential Backup and Restore Everything looks good, but let's put on our "paranoid DBA" hat and double-check. Rerunning Listing 7-7 should result in the output shown in Figure 7-11. Figure 7-11: Data verification results from native T-SQL differential restore. Restoring compressed differential backups Listing 7-10 shows the script to perform the same overall restore process as the previous section, but using the compressed differential backup file. USE [master] GO RESTORE DATABASE [DatabaseForDiffBackups] FROM DISK='C:\SQLBackups\Chapter7\DatabaseForDiffBackups_Full_Native.bak' WITH NORECOVERY GO RESTORE DATABASE [DatabaseForDiffBackups] FROM DISK='C:\SQLBackups\Chapter7\DatabaseForDiffBackups_Diff_Native_Compressed.bak' WITH RECOVERY GO Listing 7-10: Restoring a compressed native differential backup. 230
Chapter 7: Differential Backup and Restore As you can see, it's no different than a normal differential restore. You don't have to include any special options to let SQL Server know the backup is compressed. That information is stored in the backup file headers, and SQL Server will know how to handle the compressed data without any special instructions from you in the script! You will undoubtedly see that the restore took just a bit longer that the uncompressed backup would take to restore. This is simply because more work is going on to decompress the data and it, and that extra step, cost CPU time, just as an encrypted backup file would also take slightly longer to restore. Forcing Failures for Fun Having scored several notable victories with our differential backup and restore processes, it's time to taste the bitter pill of defeat. Think of it as character building; it will toughen you up for when similar errors occur in the real world! We'll start with a possible error that could occur during the backup part of the process, and then look at a couple of possible errors that could plague your restore process. Missing the base Go ahead and run the script in Listing 7-11. It creates a brand new database, then attempts to take a differential backup of that database. USE [master] GO CREATE DATABASE [ForcingFailures] ON PRIMARY ( NAME = N'ForcingFailures', FILENAME = N'C:\SQLDATA\ForcingFailures.mdf', SIZE = 5120KB , FILEGROWTH = 1024KB ) LOG ON ( NAME = N'ForcingFailures_log', FILENAME = N'C:\SQLDATA\ForcingFailures_log.ldf', SIZE = 1024KB , FILEGROWTH = 10%) GO 231
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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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Preparing for Log Backups _________
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Log Backups _______________________
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About the author Shawn McGehee Shaw
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Introduction jobs scheduled to back
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Introduction backups, to file and e
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Introduction • Chapters 5 and 6 c
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Chapter 1: Basics of Backup and Res
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The primary data file will contain:
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CREATE TABLE TableName ( ColumnDefi
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Simple Chapter 1: Basics of Backup
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Summary Chapter 1: Basics of Backup
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Chapter 9: File and Filegroup Backu
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USE [master] GO Chapter 9: File and
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USE [DatabaseForFileBackups] GO Cha
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USE [DatabaseForPartialRestore] GO
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USE [DatabaseForPartialBackups] GO
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Appendix A: SQL Backup Pro Installa
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SQL Server and .NET Tools from Red
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SQL Prompt Pro Write, edit, and exp
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SQL Monitor SQL Server performance
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SQL Toolbelt The essential SQL Serv
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.NET Reflector ® Decompile, browse
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Brad's Sure Guide to SQL Server Mai
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