查看oracle 最大并发值

如何查看ORACLE的并发值，也就是说在某一秒同时在线的人数
可是查看v$license视图
v$license视图：
里面记录了Oracle最大的并发数以及当前用户的连接数，
SQL> select SESSIONS_CURRENT,SESSIONS_HIGHWATER from v$license;
SESSIONS_CURRENT SESSIONS_HIGHWATER
---------------- ------------------
299                826
SQL> select count(*) from v$session where type='USER';
COUNT(*)
----------
299
该试图中的SESSIONS_CURRENT就等于select count(*) from v$session where TYPE = 'USER'
v$license视图官方文档有如下描述：
This view contains information about license limits.

Column	Datatype	Description
SESSIONS_MAX	NUMBER	Maximum number of concurrent user sessions allowed for the instance
SESSIONS_WARNING	NUMBER	Warning limit for concurrent user sessions for the instance
SESSIONS_CURRENT	NUMBER	Current number of concurrent user sessions
SESSIONS_HIGHWATER	NUMBER	Highest number of concurrent user sessions since the instance started
USERS_MAX	NUMBER	Maximum number of named users allowed for the database