Depending on the other services installed, you may also have access to a variety of performance counters for that service, including SQL Server and SQL Server Analysis Services.

Joey on SQL Server Why Activity Monitor May Be Hurting Your SQL Server's Performance As Joey explains, Activity Monitor consumes a lot of resources and yields little usable data.

SQL Server 2005 gives you new tools to help your database performance stay ahead of the pack.

Redgate is launching upgrades to its SQL Server performance monitoring tool, strengthening its query tuning and optimization functions to facilitate enhanced query identification, optimization ...

Spotlight Cloud makes it easy for teams to solve complex SQL Server performance issues and reduce IT costs, and as a SaaS platform, enables reduced human labor on managing the monitoring tool itself.