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specified in a USE statement) Changing the compatibility level causes all stored procedures in a database to be automatically recompiled To view the compatibility level for a database, you can query the compatibility_level column of the sysdatabases catalog view:
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USE master GO SELECT compatibility_level FROM sysdatabases WHERE name='AdventureWorks2008' GO
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When a database from a SQL Server 2000 or SQL Server 2005 instance is attached or restored to SQL Server 2008, the compatibility level setting from the older version is preserved Databases upgraded from versions earlier than 2000 have their compatibility level set to 80 Separate from a database s compatibility level is its internal version number Whereas the compatibility level is largely an indication of how statements issued against the database are parsed and executed, the internal version represents the format of the database s physical data files and can never be anything other than a number relating to the instance to which the database was last attached The version of a SQL Server database is stored in the database header (in the primary data file) and can be returned by the following query:
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USE master GO SELECT DATABASEPROPERTYEX( 'AdventureWorks2008','version') GO
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For a database attached to SQL Server 2008, this query returns the value 655, and this value will not be changed by setting the compatibility level When a database from an earlier version is attached or restored to a newer instance of SQL Server, the database s data files are automatically reformatted and the internal version number is updated There is backward compatibility when it comes to database versions, but no forward compatibility, so once a database has been moved to a newer instance (and so upgraded), it cannot be moved back The internal version numbers for SQL Server databases from version 2000 onward are as follows (note that the physical database version has changed between SQL Server 2008 and SQL Server 2008 R2): 539 = SQL Server 2000 611 = SQL Server 2005
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12: Upgrading and Migrating to SQL Server
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655 = SQL Server 2008 660 = SQL Server 2008 R2
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To date, the database version supported by a SQL Server instance has never been changed by a Service Pack As an example, attaching a database created under SQL Server 2000 to a SQL Server 2008 instance causes the database file format to be modified to the 2008 format Leaving the compatibility level at 80 means that this database can continue to use features changed or discontinued since version 2000; however, you cannot now take this database and reattach it to the SQL Server 2000 instance there is no forward compatibility between database versions The error returned when attempting to attach the database will be similar to
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The database 'PUBSMDF' cannot be opened because it is version 655 This server supports version 611 and earlier
The key point to take from this is that even after a side-by-side upgrade, once a database has been put into production and new transactions have been processed, this database cannot be downgraded The closest thing to a downgrade that can be achieved is to put the old database back into production at the point at which the original upgrade was attempted and copy in the newer data manually
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An upgrade from SQL Server 2008 to SQL Server 2008 R2 is a somewhat unique case among SQL Server upgrades in that the compatibility level has not changed, so you should expect no behavior changes or discontinued features However, since the internal database version number has changed, thorough testing is still required because you will not be able to restore or attach the upgraded database to a SQL Server 2008 instance This situation likely will become more common going forward, as Microsoft has publicly stated that it is aiming for a two-year release cycle for SQL Server, meaning we are likely to see more minor-version releases See the section The Upgrade Process for details on changing the compatibility level option after upgrade
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