Note however that those logon values in V$SYSSTAT are totaly meaningless! They are not incremented by 1 with each logon to the database as you might have expected. Sometimes with each new connection they are incremented by 1, sometimes by 9, somertimes by XYZ, and sometimes they get incremented even without any new connection taken place on the database!

Simply don't use this values for any of your reports or statistical decisions about your system, because they simply do not report the implied by their names....