查看oracle当前连接数

select * from v$session where username is not null

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select username,count(username) from v$session where username is not null group by username

#查看不同用户的连接数

select count(*) from v$session

#连接数

Select count(*) from v$session where status='ACTIVE'　#并发连接数

show parameter processes #最大连接

alter system set processes = value scope = spfile;

重启数据库