1、1345個LoadRunner英文面試筆試問題(附答案)(2) -WesetIterationsintheRunTimeSettingsoftheVuGen.ThenavigationforthisisRuntimesettings,Pacingtab,setnumberofiterations.22、Howdoyouperformfunctionaltestingunderload?-FunctionalityunderloadcanbetestedbyrunningseveralVusersconcurrently.ByincreasingtheamountofVuser

2、s,wecandeterminehowmuchloadtheservercansustain.23、WhatisRampup?Howdoyousetthis?-ThisoptionisusedtograduallyincreasetheamountofVusers/loadontheserver.Aninitialvalueissetandavaluetowaitbetweenintervalscanbespecified.TosetRampUp,gotoSeenarioSchedulingOptions24、WhatistheadvantageofrunningtheVuserasthrea

3、d?-VuGenprovidesthefacilitytousemultithreading.ThisenablesmoreVuserstoberunpergenerator.IftheVuserisrunasaprocess,thesamedriverprogramisloadedintomemoryforeachVuser,thustakingupalargeamountofmemory.ThislimitsthenumberofVusersthatcanberunonasinglegenerator.IftheVuserisrunasathread,onlyoneinstaneeofth

4、edriverprogramisloadedintomemoryforthegivennumberofVusers(say100).Eachthreadsharesthememoryoftheparentdriverprogram,thusenablingmoreVuserstoberunpergenerator.25、Ifyouwanttostoptheexecutionofyourscriptonerror,howdoyoudothat?-Thelr_abortfunctionabortstheexecutionofaVuserscript.ItinstructstheVusertosto

5、pexecutingtheActionssection,executethevuser_endsectionandendtheexecution.Thisfunctionisusefulwhenyouneedtomanuallyabortascriptexecutionasaresultofaspecificerrorcondition.Whenyouendascriptusingthisfunction,theVuserisassignedthestatusStopped.Forthistotakeeffect,wehavetofirstunchecktheContinueonerrorop

6、tioninRun-TimeSettings.26、WhatistherelationbetweenResponseTimeandThroughput?-TheThroughputgraphshowstheamountofdatainbytesthattheVusersreceivedfromtheserverinasecond.Whenwecomparethiswiththetransactionresponsetime,wewillnoticethatasthroughputdecreased,theresponsetimealsodecreased.Similarly,thepeakth

7、roughputandhighestresponsetimewouldoccurapproximatelyatthesametime.27、ExplaintheConfigurationofyoursystems?-TheconfigurationofoursystemsreferstothatoftheclientmachinesonwhichweruntheVusers.Theconfigurationofanyclientmachineincludesitshardwaresettings,memory,operatingsystem,softwareapplications,devel

8、opmenttools,etc.Thissystemcomponentconfigurationshouldmatchwiththeoverallsystemconfigurationthatwouldineludethenetworkinfrastructure,thewebserver,thedatabaseserver,andanyothercomponentsthatgowiththislargersystemsoastoachievetheloadtestingobjectives.28、Howdoyouidentifytheperformaneebottlenecks?-Perfo

9、rmaneeBottleneckscanbedetectedbyusingmonitors.Thesemonitorsmightbeapplicationservermonitors,webservermonitors,databaseservermonitorsandnetworkmonitors.Theyhelpinfindingoutthetroubledareainourscenariowhichcausesincreasedresponsetime.Themeasurementsmadeareusuallyperformaneeresponsetime,throughput,hits

10、/sec,networkdelaygraphs,etc.29、Ifwebserver,databaseandNetworkareallfinewherecouldbetheproblem?-Theproblemcouldbeinthesystemitselforintheapplicationserverorinthecodewrittenfortheapplication.30、Howdidyoufindwebserverrelatedissues?-UsingWebresourcemonitorswecanfindtheperformaneeofwebservers.Usingthesem

11、onitorswecananalyzethroughputonthewebserver,numberofhitspersecondthatoccurredduringscenario,thenumberofhttpresponsespersecond,thenumberofdownloadedpagespersecond.31、Howdidyoufinddatabaserelatedissues?-ByrunningDatabasemonitorandhelpofDataResourceGraphwecanfinddatabaserelatedissues.E.g.Youcanspecifyt

12、heresourceyouwanttomeasureonbeforerunningthecontrollerandthanyoucanseedatabaserelatedissues32、Explainallthewebrecordingoptions?33、WhatisthediffereneebetweenOverlaygraphandCorrelategraph?-OverlayGraph:Itoverlaythecontentoftwographsthatsharesacommonx-axis.LeftY-axisonthemergedgraphshowsthecurrentgraph

13、svalueRightY-axisshowthevalueofY-axisofthegraphthatwasmerged.CorrelateGraph:PlottheY-axisoftwographsagainsteachother.TheactivegraphsY-axisbecomesX-axisofmergedgraph.Y-axisofthegraphthatwasmergedbecomesmergedgraphsY-axis.34、HowdidyouplantheLoad?WhataretheCriteria?-Loadtestisplannedtodecidethenumberof

14、users,whatkindofmachineswearegoingtouseandfromwheretheyarerun.Itisbasedon2importantdocuments,TaskDistributionDiagramandTransactionprofile.TaskDistributionDiagramgivesustheinformationonnumberofusersforaparticulartransactionandthetimeoftheload.Thepeakusageandoff-usagearedecidedfromthisDiagram.Transact

15、ionprofilegivesustheinformationaboutthetransactionsnameandtheirprioritylevelswithregardtothescenariowearedeciding.35、Whatdoesvuser_initactioncontain?-Vuser_initactioncontainsprocedurestologintoaserver.36、Whatdoesvuser_endactioncontain?-Vuser_endsectioncontainslogoffprocedures.37、Whatisthinktime?Howd

16、oyouchangethethreshold?-Thinktimeisthetimethatarealuserwaitsbetweenactions.Example:Whenauserreceivesdatafromaserver,theusermaywaitseveralsecondstoreviewthedatabeforeresponding.Thisdelayisknownasthethinktime.ChangingtheThreshold:Thresholdlevelisthelevelbelowwhichtherecordedthinktimewillbeignored.Thed

17、efaultvalueisfive(5)seconds.WecanchangethethinktimethresholdintheRecordingoptionsoftheVugen.38、Whatisthediffereneebetweenstandardlogandextendedlog?-Thestandardlogsendsasubsetoffunctionsandmessagessentduringscriptexecutiontoalog.ThesubsetdependsontheVusertypeExtendedlogsendsadetailedscriptexecutionme

18、ssagestotheoutputlog.Thisismainlyusedduringdebuggingwhenwewantinformationabout:Parametersubstitution.Datareturnedbytheserver.Advaneedtrace.39、Explainthefollowingfunctions:-lr_debug_message-Thelr_debug_messagefunctionsendsadebugmessagetotheoutputlogwhenthespecifiedmessageclassisset.lr_output_message-

19、Thelr_output_messagefunctionsendsnotificationstotheControllerOutputwindowandtheVuserlogfile.lr_error_message-Thelr_error_messagefunctionsendsanerrormessagetotheLoadRunnerOutputwindow.lrd_stmt-Thelrd_stmtfunctionassociatesacharacterstring(usuallyaSQLstatement)withacursor.ThisfunctionsetsaSQLstatement

20、tobeprocessed.lrd_fetch-Thelrd_fetchfunctionfetchesthenextrowfromtheresultset.40、Throughputbanof-IfthethroughputscalesupwardastimeprogressesandthenumberofVusersincrease,thisindicatesthatthedwidthissufficient.IfthegraphweretoremainrelativelyflatasthenumberofVusersincreased,itwouldbereasonabletoconclu

21、dethatthebandwidthisconstrainingthevolumedatadelivered.41、TypesofGoalsinGoal-OrientedSeenario-LoadRunnerprovidesyouwithfivedifferenttypesofgoalsinagoalorientedscenario:ThenumberofconcurrentVusersThenumberofhitspersecondThenumberoftransactionspersecondThenumberofpagesperminuteThetransactionresponseti

22、methatyouwantyourscenario42、AnalysisSeenario(Bottlenecks):InRunningVusergraphcorrelatedwiththeresponsetimegraphyoucanseethatasthenumberofVusersincreases,theaverageresponsetimeofthecheckitinerarytransactionverygraduallyincreases.Inotherwords,theaverageresponsetimesteadilyincreasesastheloadincreases.A

23、t56Vusers,thereisasudden,sharpincreaseintheaverageresponsetime.Wesaythatthetestbroketheserver.Thatisthemeantimebeforefailure(MTBF).Theresponsetimeclearlybegantodegradewhenthereweremorethan56Vusersrunningsimultaneously.43、Whatiscorrelation?Explainthediffereneebetweenautomaticcorrelationandmanualcorre

24、lation?-Correlationisusedtoobtaindatawhichareuniqueforeachrunofthescriptandwhicharegeneratedbynestedqueries.Correlationprovidesthevaluetoavoiderrorsarisingoutofduplicatevaluesandalsooptimizingthecode(toavoidnestedqueries).Automaticcorrelationiswherewesetsomerulesforcorrelation.Itcanbeapplicationserverspecific.H