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Chad Miller

Chad Miller is a Senior Manager of Database Administration at Raymond James Financial. Chad has worked with Microsoft SQL Server since 1999 and has been automating administration tasks using Windows Powershell since 2007. Chad is the Project Coordinator/Developer of the Powershell-based Codeplex project SQL Server PowerShell Extensions (SQLPSX). Chad leads the Tampa Powershell User Group and is a frequent speaker at users groups, SQL Saturdays and Code Camps.

Powershell SQL Server Backup/Restore

I posted a script on Poshcode for doing backups and restores of SQL Server databases using SMO. The script is adapted from SQL Server Powershell Extensions functions of the same name. SMO 9.0 (2005) and 10.0 (2008) have slightly different methods and properties at times. For the most part there is very little difference, however for the backup class there is one big difference--the backup class was moved from the base SMO assembly to the SMOExtended assembly. In order to account for using either assembly, the script does a couple of things:
 
  • Load the SMO version into a global variable $smoVersion which is then used in later sections of the code
  • Load the SMOExtended assembly in all cases. On a system with just SMO 9.0 the SMO Extended assembly will not be present, but that's OK. Loading a non-existent assembly does not produce an error in Powershell. Surprising, but true, try it yourself by misspelling an assembly name.
The other thing the script does is make use of the special error handling needed for SMO due to the use of innerExceptions.
 
Looking at the Powershell + SMO script you can't help but think, how much simplier backup and restores are in T-SQL.  Here's the equivalent T-SQL command to backup a database:
 
BACKUP DATABASE AdventureWorks TO DISK = 'C:\backup\adventureworks.bak' WITH FORMAT;
 
In this case T-SQL would be much easier and less code to accomplish the same task of backing up or restoring a database.

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