Concurrent Usage

Here's something Blackboard had in its performance/maintenance (?) document for Concurrent Usage. 

To give you an idea where you fall in terms of concurrent usage check your current session count using the following query (in recent Bb versions the timestamp is only being updated every 15 minutes, so this is as good as you can hope to get for measuring recent activity).

use bb_bb60;

select count(*) from sessions where datediff(minute, timestamp, getdate())< 15