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ADDM Reports bug:Significant virtual memory paging was detected on the host operating system

2015-10-16 12:25 471 查看
查看ADDM（数据库版本为ORACLE10.2.0.5.0）报告时，发现其中有个结论非常不靠谱：Significantvirtualmemorypagingwasdetectedonthehostoperatingsystem，具体内容如下所示：

FINDING2:100%impact(3930seconds)
-------------------------------------
Significantvirtualmemorypagingwasdetectedonthehostoperatingsystem.
RECOMMENDATION1:HostConfiguration,100%benefit(3930seconds)
ACTION:Hostoperatingsystemwasexperiencingsignificantpagingbutno
particularrootcausecouldbedetected.Investigateprocessesthat
donotbelongtothisinstancerunningonthehostthatareconsuming
significantamountofvirtualmemory.Alsoconsideraddingmore
physicalmemorytothehost.




使用nmon监控并没有发现消耗大量虚拟内存（virtualmemory），搜索了一下，发现这个是一个bug导致。ORACLE10g，ORACLE11都有出现这个问题.



官方ADDMReportsSignificantVirtualMemoryPagingonLinuxWhenNoneisOccurring(文档ID1322964.1)介绍如下所示
SYMPTOMS
Afterupgradingthedatabaseto10.2.0.5,theADDMreportonLinuxoperationsystemmayincludefindingson"Significantvirtualmemorypaging":

[align=left]

FINDING1:100%impact(32719seconds)
--------------------------------------
Significantvirtualmemorypagingwasdetectedonthehostoperatingsystem.

RECOMMENDATION1:HostConfiguration,100%benefit(32719seconds)
ACTION:Hostoperatingsystemwasexperiencingsignificantpagingbut
noparticularrootcausecouldbedetected.Investigateprocessesthat
donotbelongtothisinstancerunningonthehostthatare
consumingsignificantamountofvirtualmemory.Alsoconsideraddingmore
physicalmemorytothehost.[/align]

ThereisnoevidenceatOSlevelofanyproblemwithvirtualmemorypaging.Toverifythatyouarenotreallyobservingamemoryproblem,lookatanoperatingsystemmemorytool,suchasvmstat:

oracle$vmstat55
procs-----------memory-------------swap-------io------system-------cpu------
rbswpdfreebuffcachesisobiboincsussyidwast
1067005611845803577212809336002640153276810
00670028118362435788128109800072212982534319060
106700161171840358041281343600234162126915177160
106699961175536358161281706400619142429579277120
0066996811834083584012820460008281430285014373100


Note:Underswap,siandsoshowavalueof0.
Asabove,iftherearenoabnormalfiguresandyouarestillseeingthiswarning,youmightmehittingthisproblem

CAUSE
Thisissuecanbeseenfrom10.2.0.5to11.2.0.2

[align=left]
TheproblemiscausedbywrongvaluesinV$OSSTATasexplainedin:
Bug10148787ADDMREPORTSVIRTUALMEMORYPAGINGAFTERAPPLYING10.2.0.5
andunpublishedBug11712010VIRTUALMEMORYPAGINGON11.2.0.2DATABASES.
[/align]
ORACLE10.2.0.5可以通过下载补丁补丁程序12347332:TRACKINGBUGTOFIXADDMINCORRECTLYREPORTINGPAGINGON10.2.0.5解决这个Bug
                                            

                                        

                        
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