检查发现一套使用ASM的rac两个实例基本上每个小时都会报一次ORA-32701错误，截取alert日志中错误信息如下：

一：版本信息

操作系统版本：AIX 61009

Oracle数据库版本：11.2.0.3.11(RAC)

二：错误描述

检查发现一套使用ASM的rac两个实例基本上每个小时都会报一次ORA-32701错误，截取alert日志中错误信息如下：

Sat Dec 06 09:44:00 2014
Errors in file /oracle/app/oracle/diag/rdbms/egmmdb/egmmdb2/trace/egmmdb2_dia0_13500888.trc (incident=1041128):
ORA-32701: Possible hangs up to hang ID=0 detected
Incident details in: /oracle/app/oracle/diag/rdbms/egmmdb/egmmdb2/incident/incdir_1041128/egmmdb2_dia0_13500888_i1041128.trc
DIA0 terminating blocker (ospid: 15335610 sid: 1299 ser#: 5849) of hang with ID = 3
requested by master DIA0 process on instance 1
Hang Resolution Reason: Although the number of affected sessions did not
justify automatic hang resolution initially, this previously ignored
hang was automatically resolved.
by terminating session sid: 1299 ospid: 15335610
Sat Dec 06 09:44:01 2014
Sweep [inc][1041128]: completed
Sweep [inc2][1041128]: completed
DIA0 successfully terminated session sid:1299 ospid:15335610 with status 31.
Sat Dec 06 09:45:35 2014
Errors in file /oracle/app/oracle/diag/rdbms/egmmdb/egmmdb2/trace/egmmdb2_dia0_13500888.trc (incident=1041129):
ORA-32701: Possible hangs up to hang ID=0 detected
Incident details in: /oracle/app/oracle/diag/rdbms/egmmdb/egmmdb2/incident/incdir_1041129/egmmdb2_dia0_13500888_i1041129.trc
DIA0 terminating blocker (ospid: 15335610 sid: 1299 ser#: 5849) of hang with ID = 3
requested by master DIA0 process on instance 1
Hang Resolution Reason: Although the number of affected sessions did not
justify automatic hang resolution initially, this previously ignored
hang was automatically resolved.
by terminating the process
DIA0 successfully terminated process ospid:15335610.
Sat Dec 06 09:45:37 2014
Sweep [inc][1041129]: completed
Sweep [inc2][1041129]: completed
Sat Dec 06 10:45:12 2014
Errors in file /oracle/app/oracle/diag/rdbms/egmmdb/egmmdb2/trace/egmmdb2_dia0_13500888.trc (incident=1041130):
ORA-32701: Possible hangs up to hang ID=0 detected
Incident details in: /oracle/app/oracle/diag/rdbms/egmmdb/egmmdb2/incident/incdir_1041130/egmmdb2_dia0_13500888_i1041130.trc
Sat Dec 06 10:45:13 2014
Sweep [inc][1041130]: completed
Sweep [inc2][1041130]: completed

egmmdb2_dia0_13500888_i1041129.trc中截取如下信息：

*** 2014-12-06 09:45:35.770
Resolvable Hangs in the System
Root Chain Total Hang
Hang Hang Inst Root #hung #hung Hang Hang Resolution
ID Type Status Num Sess Sess Sess Conf Span Action
----- ---- -------- ---- ----- ----- ----- ------ ------ -------------------
3 HANG RSLNPEND 2 1299 2 2 HIGH GLOBAL Terminate Process
Hang Resolution Reason: Although the number of affected sessions did not
justify automatic hang resolution initially, this previously ignored
hang was automatically resolved.

inst# SessId Ser# OSPID PrcNm Event
----- ------ ----- --------- ----- -----
1 1444 7855 10420452 M000 enq: FU - contention
2 1299 5849 15335610 M000 not in wait <<<<====从这里我们可以看出一个M00*进程阻塞了另一个M00*进程(从上面的alert日志中我们可以看到，Hang Manager通过杀掉造成阻塞的1299会话解决Hang问题)

Dumping process info of pid[155.15335610] (sid:1299, ser#:5849)
requested by master DIA0 process on instance 1.

*** 2014-12-06 09:45:35.770
Process diagnostic dump for oracle@egmmdb2 (M000), OS id=15335610,
pid: 155, proc_ser: 153, sid: 1299, sess_ser: 5849
-------------------------------------------------------------------------------
os thread scheduling delay history: (sampling every 1.000000 secs)
0.000000 secs at [ 09:45:35 ]
NOTE: scheduling delay has not been sampled for 0.376554 secs 0.000000 secs from [ 09:45:31 - 09:45:36 ], 5 sec avg
0.000000 secs from [ 09:44:36 - 09:45:36 ], 1 min avg
0.000000 secs from [ 09:40:36 - 09:45:36 ], 5 min avg
loadavg : 2.68 2.42 2.41
swap info: free_mem = 19881.13M rsv = 256.00M
alloc = 138.07M avail = 65536.00M swap_free = 65397.93M
F S UID PID PPID C PRI NI ADDR SZ WCHAN STIME TTY TIME CMD
240001 A oracle 15335610 1 0 60 20 948d16590 209136 f1000a01500d48b0 08:37:22 - 0:01 ora_m000_egmmdb2
Short stack dump:
ksedsts()+360<-ksdxfstk()+44<-ksdxcb()+3384<-sspuser()+116<-49f0<-sntpread()+40<-ntpfprd()+116<-nsbasic_brc()+1116<-nsbrecv()+128<-nioqrc()+17480<-ttcdrv()+988<-nioqwa()+76<-upirtrc()+2428<-kpurcsc()+108<-kpuexec()+3088<-OCIStmtExecute()+32<-kfgGrpTableCbInternal()+2756<-kfgGrpTableCb()+48<-qerfxFetch()+3728<-qergsFetch()+6856<-opifch2()+6228<-opiefn0()+552<-opipls()+3492<-opiodr()+720<-rpidrus()+216<-skgmstack()+120<-rpidru()+132<-rpiswu2()+480<-rpidrv()+1060<-psddr0()+260<-psdnal()+472<-pevm_EXECC()+532<-pfrinstr_EXECC()+72<-pfrrun_no_tool()+96<-pfrrun()+1032<-plsql_run()+616<-peicnt()+320<-kkxexe()+508<-opiexe()+17224<-opiall0()+1296<-opikpr()+488<-opiodr()+720<-rpidrus()+216<-skgmstack()+120<-rpidru()+132<-rpiswu2()+480<-kprball()+1036<-kkxsexr()+380<-kkxsexe()+604<-pevm_icd_call_common()+6<-pfrinstr_ICAL()+156<-pfrrun_no_tool()+96<-pfrrun()+1032<-plsql_run()+616<-peicnt()+320<-kkxexe()+508<-opiexe()+17224<-kpoal8()+4616<-opiodr()+720<-kpoodrc()+36<-rpiswu2()+480<-kpoodr()+512<-upirtrc()+1328<-kpurcsc()+108<-kpuexec()+10448<-OCIStmtExecute()+32<-kewuxs_execute_statement()+676<-kewfeus_execute_usage_sampling()+268<-kewfads_auto_dbfus_slave()+1296<-kebm_slave_main()+492<-ksvrdp()+1708<-opirip()+724<-opidrv()+608<-sou2o()+136<-opimai_real()+188<-ssthrdmain()+268<-main()+204<-__start()+112

-------------------------------------------------------------------------------
Process diagnostic dump actual duration=0.084000 sec
(max dump time=15.000000 sec)