The Connected Sessions chart contains an area graph showing the number of SQL Server sessions over time. If you have a non-zero User Connections parameter set on the server being monitored, the Y-axis is scaled to the value you specified, which allows you to see how close you are to this limit. Sessions are categorized as:
- Internal SQL Server System sessions
- Active user sessions
- Idle user sessions
A Session is a single connection to SQL Server. Some applications establish multiple sessions to SQL Server. If there are multiple applications running on a target computer that are all communicating with SQL Server, they will also have created multiple SQL Server sessions.