SQL server DB status runnable, sleeping, suspended, running and background meanings
The status values are documented with sp_who:


  The possible values are:
  
  Dormant - SQL Server is resetting the session.
  
  Running - The session is running one or more batches. When Multiple Active Result Sets (MARS) is enabled, a session can run
  multiple batches. For more information, see Using Multiple Active
  Result Sets (MARS).
  
  Background - The session is running a background task, such as deadlock detection.
  
  Rollback - The session has a transaction rollback in the process.
  
  Pending - The session is waiting for a worker thread to become available.
  
  Runnable - The session's task is in the runnable queue of a scheduler while waiting to get a time quantum.
  
  Spinloop - The session's task is waiting for a spinlock to become free.
  
  Suspended - The session is waiting for an event, such as I/O, to complete.