Question

我想找出阻止任何操作的查询。从DBA我得到的输入是特定会话被阻止但我无法在不知道哪个查询导致问题的情况下进一步调查。有没有办法找出导致问题的确切查询？

Answer 1

首先从此脚本中获取BLOCKING会话的SQL_ID：

SELECT /*+ RULE */
s.sid,
s.serial#,
p.spid "OS SID",
s.sql_hash_value "HASH VALUE",
s.username "ORA USER",
s.status,
s.osuser "OS USER",
s.machine,
s.terminal,
s.type,
s.program,
s.logon_time,
s.last_call_et,
s.sql_id,
l.id1,
l.id2,
decode(l.block,0,'WAITING',1,'BLOCKING') block,
decode(
l.LMODE,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive',null) lmode,
decode(
l.REQUEST,1,'No Lock',
2,'Row Share',
3,'Row Exclusive',
4,'Share',
5,'Share Row Exclusive',
6,'Exclusive',null) request ,
round(l.ctime/60,2) "MIN WAITING",
l.type
FROM v$process p, v$session s, v$Lock l
where p.addr = s.paddr
and s.sid=l.sid
and
(l.id1,l.id2,l.type) in
(SELECT l2.id1, l2.id2, l2.type
  FROM V$LOCK l2
  WHERE l2.request<>0)
order by l.id1,l.id2,l.block desc;

然后将此SQL_ID传递到此脚本中：

select sql_text from v$sqltext
where sql_id=<SQL_ID>;

Answer 2

您可以使用以下查询来查找哪些会话正在臃肿以及它们的作用：

select s.module,
       s.program,
       s.machine,
       s.osuser,
       sql.sql_text
from v$session s,
     v$sqlarea sql
where s.sql_id = sql.sql_id
and s.sid in (select blocking_session from v$session)

从oracle中查找阻塞会话的查询

2 个答案: