11G以後，hanganalyze的輸出想必大家都看見了，這尼瑪的太難看了。
爲了解決吳同學的這個問題。ORACLE在11G以後給大家提供了一個偉大的視圖，v$wait_chains.
11.1開始，DIA0後臺進程自動收集hanganalyze信息至指定內存區域（LOCAL 3秒，GLOBAL 10秒），這些數據對於分析當前數據庫hang是極有價值的。
以下兩個腳本供大家使用：
1.查找當前100個數據庫掛起進程
set pages 1000
set lines 120
set heading off
column w_proc format a50 tru
column instance format a20 tru
column inst format a28 tru
column wait_event format a50 tru
column p1 format a16 tru
column p2 format a16 tru
column p3 format a15 tru
column Seconds format a50 tru
column sincelw format a50 tru
column blocker_proc format a50 tru
column waiters format a50 tru
column chain_signature format a100 wra
column blocker_chain format a100 wra
SELECT *
FROM (SELECT 'Current Process: '||osid W_PROC, 'SID '||i.instance_name INSTANCE,
'INST #: '||instance INST,'Blocking Process: '||decode(blocker_osid,null,'<none>',blocker_osid)||
' from Instance '||blocker_instance BLOCKER_PROC,'Number of waiters: '||num_waiters waiters,
'Wait Event: ' ||wait_event_text wait_event, 'P1: '||p1 p1, 'P2: '||p2 p2, 'P3: '||p3 p3,
'Seconds in Wait: '||in_wait_secs Seconds, 'Seconds Since Last Wait: '||time_since_last_wait_secs sincelw,
'Wait Chain: '||chain_id ||': '||chain_signature chain_signature,'Blocking Wait Chain: '||decode(blocker_chain_id,null,
'<none>',blocker_chain_id) blocker_chain
FROM v$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;
Current Process: 27536 SID test INST #: 1
Blocking Process: <none> from Instance Number of waiters: 1
Final Blocking Process: <none> from Instance Program:
Wait Event: SQL*Net message from client P1: 1650815232 P2: 1 P3: 0
Seconds in Wait: 61 Seconds Since Last Wait:
Wait Chain: 1: 'SQL*Net message from client'<='enq: TX - row lock contention'
Blocking Wait Chain: <none>
Current Process: 27712 SID test INST #: 1
Blocking Process: 27536 from Instance 1 Number of waiters: 0
Final Blocking Process: 27536 from Instance 1 Program:
oracle@11g (TNS V1-V3)
Wait Event: enq: TX - row lock contention P1: 1415053318 P2: 393241 P3: 1129
Seconds in Wait: 18 Seconds Since Last Wait:
Wait Chain: 1: 'SQL*Net message from client'<='enq: TX - row lock contention'
Blocking Wait Chain: <none>
2.查找FINAL BLOCKER
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,'<none>',blocker_osid)||
' from Instance '||blocker_instance BLOCKER_PROC,
'Number of waiters: '||num_waiters waiters,
'Final Blocking Process: '||decode(p.spid,null,'<none>',
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,
'<none>',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;
Current Process: 27712 SID test INST #: 1
Blocking Process: <none> from Instance Number of waiters: 1
Final Blocking Process: <none> from Instance Program:
Wait Event: SQL*Net message from client P1: 1650815232 P2: 1 P3: 0
Seconds in Wait: 80 Seconds Since Last Wait:
Wait Chain: 1: 'SQL*Net message from client'<='enq: TX - row lock contention'
Blocking Wait Chain: <none>
Current Process: 27818 SID test INST #: 1
Blocking Process: 27712 from Instance 1 Number of waiters: 0
Final Blocking Process: 27712 from Instance 1 Program:
oracle@11g (TNS V1-V3)
Wait Event: enq: TX - row lock contention P1: 1415053318 P2: 196627 P3: 948
Seconds in Wait: 60 Seconds Since Last Wait:
Wait Chain: 1: 'SQL*Net message from client'<='enq: TX - row lock contention'
Blocking Wait Chain: <none>
然後怎麼辦？然後你知道怎麼辦的。。呵呵。。。
特此記錄！