查詢堵塞程式的幾種SQL--

darrenduan發表於2016-07-01
SQL
  逛論壇看到一篇關於blocking session的帖子 歸納一下幾種查詢

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
現在有v$wait_chains介面了

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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