SQL Server 2008 compatibility levels

SQL Server can run in a number of different compatibility levels, but how do you change it and how do you set it. These compatibility levels reflect the version of SQL server.

  • 60 = SQL Server 6.0
  • 65 = SQL Server 6.5
  • 70 = SQL Server 7.0
  • 80 = SQL Server 2000
  • 90 = SQL Server 2005
  • 100 = SQL Server 2008

Changing the compatibility level in SQL Server may change the behavior of specific of the functionality of the SQL Server. Be sure to research and test before changing compatibility levels.

Here is a sample script that will show you the current compatibility level, set it to 90, then show you the current level after it has been set.

Sp_dbcmptlevel dbname
GO
Sp_dbcmptlevel dbname, 100
GO
Sp_dbcmptlevel dbname
GO

This TSQL will generate the following output:

The current compatibility level is 90.
The current compatibility level is 100.

Once you change the compatibility level, you will want to be sure that your system still runs correctly.