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：

SQL> select SESSIONS_CURRENT,SESSIONS_HIGHWATER from v$license;
SESSIONS_CURRENT SESSIONS_HIGHWATER
---------------- ------------------
               47                  83

SQL> select count(*) from v$session where type='USER';
COUNT(*)
----------
     49

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

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