SQL Server Backup and Restore - Simple Talk

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Chapter 9: File and Filegroup Backup and Restore Once you do this, your database will be back online and recovered up to the point of the failure! This is a huge time saver since restoring all of the files could take quite a long time. Having to restore only the data file that was affected by the crash will cut your recovery time down significantly. However, there are a few caveats attached to this technique, which we'll discuss as we walk through a demo. Specifically, we're going to use SQL Backup scripts (these can easily be adapted into native T-SQL scripts) to show how we might restore just a single damaged, or otherwise unusable, secondary data file for our DatabaseForFile- Backups_SB database, without having to restore the primary data file. Note that if the primary data file went down, we'd have to restore the whole database, rather than just the primary data file. However, with Enterprise Edition SQL Server, it would be possible to get the database back up and running by restoring only the primary data file, followed subsequently by the other data files. We'll discuss that in more detail in the next section. This example is going to use our DatabaseForFileBackups_SB database to restore from a single disk / single file failure, using SQL Backup T-SQL scripts. A script demonstrating the same process using native T-SQL is available with the code download for this book. If you recall, for this database we have Table_DF1, stored in the primary data file (DatabaseForFileBackups_SB.mdf) in the PRIMARY filegroup, and Table_DF2, stored in the secondary data file (DatabaseForFileBackups_SB_Data2.ndf) in the SECONDARY filegroup. Our first data load (one row into each table) was captured in full file backups for each filegroup. We then captured a first transaction log backup. Our second data load (an additional row into each table) was captured in differential file backups for each filegroup. Finally, we took a second transaction log backup. Let's perform a third data load, inserting one new row into Table_DF2. 330
Chapter 9: File and Filegroup Backup and Restore USE [DatabaseForFileBackups_SB] GO INSERT INTO Table_DF2 VALUES ( 'This is the third data load for Table_DF2' ) GO Listing 9-26: Third data load for DatabaseForFileBackups_SB. Now we're going to simulate a problem with our secondary data file which takes it (and our database) offline; in Listing 9-27 we take the database offline. Having done so, navigate to the C:\SQLData\Chapter9 folder and delete the secondary data file! -- Take DatabaseForFileBackups_SB offline USE master GO ALTER DATABASE [DatabaseForFileBackups_SB] SET OFFLINE; GO /*Now delete DatabaseForFileBackups_SB_Data2.ndf!*/ Listing 9-27: Take DatabaseForFileBackups_SB offline and delete secondary data file! Scary stuff! Next, let's attempt to bring our database back online. USE master GO ALTER DATABASE [DatabaseForFileBackups_SB] SET ONLINE; GO Msg 5120, Level 16, State 5, Line 1 Unable to open the physical file "C:\SQLData\DatabaseForFileBackups_SB_Data2.ndf". Operating system error 2: "2(failed to retrieve text for this error. Reason: 15105)". Msg 945, Level 14, State 2, Line 1 Database 'DatabaseForFileBackups_SB' cannot be opened due to inaccessible files or insufficient memory or disk space. See the SQL Server errorlog for details. Msg 5069, Level 16, State 1, Line 1 ALTER DATABASE statement failed. Listing 9-28: Database cannot come online due to missing secondary data file. 331
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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 • 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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SQL Prompt Pro Write, edit, and exp
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SQL Monitor SQL Server performance
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.NET Reflector ® Decompile, browse
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Brad's Sure Guide to SQL Server Mai
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