SharePoint Server 2010 and Search Server 2010 ship with SQL Server 2008 Express by default. However, you can leverage SQL Server 2008 R2 or 2012…
Cumulative Update 5 for SQL Server 2008 R2 SP1 has been released. This release includes some fixes for Reporting Services and PowerPoint for SharePoint 2010.
SQL Server 2008 R2 SP1 CU 4 has been released :http://support.microsoft.com/kb/2633146
SQL Server 2008 R2 CU 11 has been released: http://support.microsoft.com/kb/2633145 This one fixes a specific issue with rendering the Report Viewer: http://support.microsoft.com/kb/2624915