Session counts

SELECT name, value
FROM v$parameter
WHERE name = 'sessions'


SELECT COUNT(*)
FROM v$session

SELECT
'Currently, '
|| (SELECT COUNT(*) FROM V$SESSION)
|| ' out of '
|| VP.VALUE
|| ' connections are used.' AS USAGE_MESSAGE
FROM
V$PARAMETER VP
WHERE VP.NAME = 'sessions'


SELECT
'Currently, '
|| (SELECT COUNT(*) FROM V$SESSION)
|| ' out of '
|| DECODE(VL.SESSIONS_MAX,0,'unlimited',VL.SESSIONS_MAX)
|| ' connections are used.' AS USAGE_MESSAGE
FROM
V$LICENSE VL