SQL Nexus is a tool that helps you identify the root cause of SQL Server performance issues. It loads and analyzes performance data collected by SQLDiag and PSSDiag . It can dramatically reduce the amount of time you spend manually analyzing data. With
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Read the complete post at http://blogs.technet.com/stefan_stranger/archive/2009/01/12/using-sql-nexus-to-troubleshoot-opsmgr-sql-server-performance-issues.aspx