查询堵塞进程的几种SQL--

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转载最新推荐文章于 2025-09-18 13:03:53 发布 · 285 阅读

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本文介绍了四种查询Oracle数据库中阻塞会话的方法，包括使用v$lock视图、v$wait_chains视图等进行查询的具体SQL语句，帮助快速定位数据库中出现的阻塞情况。

逛论坛看到一篇关于blocking session的帖子归纳一下几种查询

①
with vw_lock AS (SELECT * FROM v$lock)
select
a.sid,
'is blocking',
(select 'sid:'||s.sid||' object:'||do.object_name||' rowid:'||
dbms_rowid.rowid_create ( 1, ROW_WAIT_OBJ#, ROW_WAIT_FILE#, ROW_WAIT_BLOCK#, ROW_WAIT_ROW# )
||' sql_id:'||s.sql_id
from v$session s, dba_objects do
where s.sid=b.sid
and s.ROW_WAIT_OBJ# = do.OBJECT_ID
) blockee,
b.sid,b.id1,b.id2
from vw_lock a, vw_lock b
where a.block = 1
and b.request > 0
and a.id1 = b.id1
and a.id2 = b.id2;

②SELECT /*+ ORDERED USE_HASH(H,R) */
      H.SID HOLD_SID,
      R.SID WAIT_SID,
      decode(H.type,
      'MR', 'Media Recovery',
      'RT', 'Redo Thread',
      'UN', 'User Name',
      'TX', 'Transaction',
      'TM', 'DML',
      'UL', 'PL/SQL User Lock',
      'DX', 'Distributed Xaction',
      'CF', 'Control File',
      'IS', 'Instance State',
      'FS', 'File Set',
      'IR', 'Instance Recovery',
      'ST', 'Disk Space Transaction',
      'TS', 'Temp Segment',
      'IV', 'Library Cache Invalidation',
      'LS', 'Log Start or Switch',
      'RW', 'Row Wait',
      'SQ', 'Sequence Number',
      'TE', 'Extend Table',
      'TT', 'Temp Table',
      'TC', 'Thread Checkpoint',
            'SS', 'Sort Segment',
            'JQ', 'Job Queue',
            'PI', 'Parallel operation',
            'PS', 'Parallel operation',
            'DL', 'Direct Index Creation',
      H.type) type,
   decode(H.lmode,
      0, 'None', 1, 'Null',
      2, 'Row-S (SS)', 3, 'Row-X (SX)',
      4, 'Share',       5, 'S/Row-X (SSX)',
      6, 'Exclusive', to_char(H.lmode)) hold,
   decode(r.request, 0, 'None',
      1, 'Null', 2, 'Row-S (SS)',
      3, 'Row-X (SX)', 4, 'Share',
      5, 'S/Row-X (SSX)',6, 'Exclusive',
      to_char(R.request)) request,
   R.ID1,R.ID2,R.CTIME
FROM V$LOCK H,V$LOCK R
WHERE H.BLOCK = 1 AND R.REQUEST > 0 AND H.SID <> R.SID
   and H.TYPE <> 'MR' AND R.TYPE <> 'MR'
   AND H.ID1 = R.ID1 AND H.ID2 = R.ID2 AND H.TYPE=R.TYPE
   AND H.LMODE > 0 AND R.REQUEST > 0 ORDER BY 1,2;

③

select /*+ rule */
l.block blk_status,
l.inst_id,
l.sid, /* s.serial#, */
p.spid,
s.status,
s.sql_hash_value hash_value,
s.program,
s.username,
s.last_call_et, /* s.sql_id,s.sql_child_number c_n,*/
l.lmode,
l.type,
l.request,
l.ctime
  from (select inst_id,
            sid,
            type,
            id1,
            id2,
            lmode,
            request,
            ctime,
            decode(block, 0, 'blocked', 1, 'blocking', 2, 'global') block
      from gv$lock
      where (id1, id2, type) in
            (select id1, id2, type from gv$lock where request > 0)) l,
   gv$session s,
   gv$process p
where l.sid = s.sid
and l.inst_id = s.inst_id
and s.inst_id = p.inst_id
and s.paddr = p.addr
and s.username is not null
order by 1, inst_id, status;

④

现在有v$wait_chains接口了

Basic Information:
SELECT chain_id, num_waiters, in_wait_secs, osid, blocker_osid, substr(wait_event_text,1,30) FROM v$wait_chains;

Top 100 wait chain processes:
set pages 1000
set lines 120
set heading off
column w_proc format a50 tru
column instance format a20 tru
column inst format a28 tru
column wait_event format a50 tru
column p1 format a16 tru
column p2 format a16 tru
column p3 format a15 tru
column Seconds format a50 tru
column sincelw format a50 tru
column blocker_proc format a50 tru
column waiters format a50 tru
column chain_signature format a100 wra
column blocker_chain format a100 wra

SELECT *
FROM (SELECT 'Current Process: '||osid W_PROC, 'SID '||i.instance_name INSTANCE,
'INST #: '||instance INST,'Blocking Process: '||decode(blocker_osid,null,'',blocker_osid)||
' from Instance '||blocker_instance BLOCKER_PROC,'Number of waiters: '||num_waiters waiters,
'Wait Event: ' ||wait_event_text wait_event, 'P1: '||p1 p1, 'P2: '||p2 p2, 'P3: '||p3 p3,
'Seconds in Wait: '||in_wait_secs Seconds, 'Seconds Since Last Wait: '||time_since_last_wait_secs sincelw,
'Wait Chain: '||chain_id ||': '||chain_signature chain_signature,'Blocking Wait Chain: '||decode(blocker_chain_id,null,
'',blocker_chain_id) blocker_chain
FROM v$wait_chains wc,
v$instance i
WHERE wc.instance = i.instance_number (+)
AND ( num_waiters > 0
OR ( blocker_osid IS NOT NULL
AND in_wait_secs > 10 ) )
ORDER BY chain_id,
num_waiters DESC)
WHERE ROWNUM < 101;

Final Blocking Session in 11.2:
set pages 1000
set lines 120
set heading off
column w_proc format a50 tru
column instance format a20 tru
column inst format a28 tru
column wait_event format a50 tru
column p1 format a16 tru
column p2 format a16 tru
column p3 format a15 tru
column Seconds format a50 tru
column sincelw format a50 tru
column blocker_proc format a50 tru
column fblocker_proc format a50 tru
column waiters format a50 tru
column chain_signature format a100 wra
column blocker_chain format a100 wra

SELECT *
FROM (SELECT 'Current Process: '||osid W_PROC, 'SID '||i.instance_name INSTANCE,
'INST #: '||instance INST,'Blocking Process: '||decode(blocker_osid,null,'',blocker_osid)||
' from Instance '||blocker_instance BLOCKER_PROC,
'Number of waiters: '||num_waiters waiters,
'Final Blocking Process: '||decode(p.spid,null,'',
p.spid)||' from Instance '||s.final_blocking_instance FBLOCKER_PROC,
'Program: '||p.program image,
'Wait Event: ' ||wait_event_text wait_event, 'P1: '||wc.p1 p1, 'P2: '||wc.p2 p2, 'P3: '||wc.p3 p3,
'Seconds in Wait: '||in_wait_secs Seconds, 'Seconds Since Last Wait: '||time_since_last_wait_secs sincelw,
'Wait Chain: '||chain_id ||': '||chain_signature chain_signature,'Blocking Wait Chain: '||decode(blocker_chain_id,null,
'',blocker_chain_id) blocker_chain
FROM v$wait_chains wc,
gv$session s,
gv$session bs,
gv$instance i,
gv$process p
WHERE wc.instance = i.instance_number (+)
AND (wc.instance = s.inst_id (+) and wc.sid = s.sid (+)
and wc.sess_serial# = s.serial# (+))
AND (s.final_blocking_instance = bs.inst_id (+) and s.final_blocking_session = bs.sid (+))
AND (bs.inst_id = p.inst_id (+) and bs.paddr = p.addr (+))
AND ( num_waiters > 0
OR ( blocker_osid IS NOT NULL
AND in_wait_secs > 10 ) )
ORDER BY chain_id,
num_waiters DESC)
WHERE ROWNUM < 101;

Troubleshooting Database Contention With V$Wait_Chains (Doc ID 1428210.1)

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