Keep your system up to date with the most recent cumulative update package for SQL Server 2008 SP2. For customers upgrading to Service Pack 2 from SQL Server 2008 SP1 CU9 (Build 10.00.2789) & 10 (Build 10.00.2799) should consider applying SQL Server 2008 SP2 CU 1 to ensure fixes presented in SQL Server 2008 SP1 CU 9 & CU 10 are available on their systems. SQL Server 2008 SP2 Cumulative Update 1 does not contain any additional fixes.
CU#1 KB Article: http://support.microsoft.com/kb/2289254
Understanding Incremental Servicing Model for SQL Server
SQL Server Support Information: http://support.microsoft.com/ph/2855
SQL Server Sustained Engineering
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