如何在 Oracle 中列出活动/打开的连接？

是否有任何隐藏的表，系统变量或其他东西显示活跃的连接在给定的时刻？

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最佳答案

使用 V$SESSION视图。

V$SESSION显示每个当前会话的会话信息。

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有关更完整的答案，请参阅: Http://dbaforums.org/oracle/index.php?showtopic=16834

select
substr(a.spid,1,9) pid,
substr(b.sid,1,5) sid,
substr(b.serial#,1,5) ser#,
substr(b.machine,1,6) box,
substr(b.username,1,10) username,
--       b.server,
substr(b.osuser,1,8) os_user,
substr(b.program,1,30) program
from v$session b, v$process a
where
b.paddr = a.addr
and type='USER'
order by spid;
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当我想查看从应用服务器到数据库的传入连接时，我使用以下命令:

SELECT username FROM v$session
WHERE username IS NOT NULL
ORDER BY username ASC;

简单，但有效。

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select
username,
osuser,
terminal,
utl_inaddr.get_host_address(terminal) IP_ADDRESS
from
v$session
where
username is not null
order by
username,
osuser;
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Select count(1) From V$session
where status='ACTIVE'
/
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select status, count(1) as connectionCount from V$SESSION group by status;
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下面给出了按连接数排序的操作系统用户列表，这在查找资源过度使用情况时非常有用。

select osuser, count(*) as active_conn_count
from v$session
group by osuser
order by active_conn_count desc
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select
count(1) "NO. Of DB Users",
to_char(sysdate,'DD-MON-YYYY:HH24:MI:SS') sys_time
from
v$session
where
username is NOT  NULL;
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select s.sid as "Sid", s.serial# as "Serial#", nvl(s.username, ' ') as "Username", s.machine as "Machine", s.schemaname as "Schema name", s.logon_time as "Login time", s.program as "Program", s.osuser as "Os user", s.status as "Status", nvl(s.process, ' ') as "OS Process id"
from v$session s
where nvl(s.username, 'a') not like 'a' and status like 'ACTIVE'
order by 1,2

此查询试图过滤掉所有后台进程。


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