Did you look online for that?
http://msdn.microsoft.com/en-us/library/bb500435%28v=sql.100%29.aspx (SQL 2008)
http://msdn.microsoft.com/en-us/library/bb500435.aspx (SQL 2012)
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability