0、数据库参数属性
col PROPERTY_NAME format a25
col PROPERTY_VALUE format a30
col DESCRIPTION format a100
select * from database_properties;

select * from v$version;

1、求当前会话的SID，SERIAL#
SELECT Sid, Serial# FROM V$session
WHERE Audsid = Sys_Context('USERENV', 'SESSIONID');

2、查询session的OS进程ID
SELECT p.Spid "OS Thread", b.NAME "Name-User", s.Program, s.Sid, s.Serial#,s.Osuser, s.Machine
FROM V$process p, V$session s, V$bgprocess b
WHERE p.Addr = s.Paddr
AND p.Addr = b.Paddr And (s.sid=&1 or p.spid=&1)
UNION ALL
SELECT p.Spid "OS Thread", s.Username "Name-User", s.Program, s.Sid,s.Serial#, s.Osuser, s.Machine
FROM V$process p, V$session s
WHERE p.Addr = s.Paddr
And (s.sid=&1 or p.spid=&1)
AND s.Username IS NOT NULL;

3、根据sid查看对应连接正在运行的sql
SELECT /*+ PUSH_SUBQ */ Command_Type, Sql_Text, Sharable_Mem, Persistent_Mem, Runtime_Mem, Sorts,
Version_Count, Loaded_Versions, Open_Versions, Users_Opening, Executions,
Users_Executing, Loads, First_Load_Time, Invalidation