Мониторинг Windows + perfmon

http://www.simple-talk.com/sql/performance/collecting-performance-data-into-a-sql-server-table/

http://www.mssqltips.com/sqlservertip/1776/automate-performance-monitor-statistics-collection-for-sql-server-and-windows/ 

http://www.simple-talk.com/blogs/2010/12/20/getting-baseline-and-performance-stats-the-easy-way/