1. 先通过top命令查看产用资源较多的pid号， 注意：top命令的user的oacle的，关注pid
2.查询当前耗时的会话ID，用户名，sqlID等：其中top中的pid就是v$process的spid字段值。不是v$process视图中的pid值。
select sid,serial#,machine,username,program,sql_hash_value,sql_id,
to_char(logon_time,'yyyy/mm/dd hh24:mi:ss') as login_time from v$session
where paddr in (select addr from v$process where spid in ('5648612','256500')); 其中 5648612','256500' 就是查询出的进程对应的PID值。
3. 如果上一步sql_id或者 hash_value不为空，则可用v$sqlarea查出当前正在使用的sql
select sql_text
from v$sqltext_with_newlines
where hash_value = &hash_value
order by piece;
select * from v$sql where sql_id=''
?
--网友提供的----
?
SELECT sql_text
FROM v$sqltext a
WHERE (a.hash_value, a.address) IN
(SELECT DECODE(sql_hash_value, 0, prev_hash_value, sql_hash_value),
DECODE(sql_hash_value, 0, prev_sql_addr, sql_address)
FROM v$session b
WHERE b.paddr = (SELECT addr FROM v$process c WHERE c.spid = '&pid'))
ORDER BY piece ASC