查看session：
select * from v$session where username is not null
select username,count(username) from v$session where username is not null group by username
当前连接数：
select count(*) from v$process
查看连接数参数的设置情况
select value from v$parameter where name = 'processes'
Select count(*) from v$session where status='ACTIVE' #并发连接数
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